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1. Controlling the diversity of ion-induced fragmentation pathways by N-methylation of amino acids

Author: Darío Barreiro-Lage, Chiara Nicolafrancesco, Jaroslav Kočišek, Alberto Luna, Janina Kopyra, Manuel Alcamí, Bernd A. Huber, Fernando Martín, Alicja Domaracka, Patrick Rousseau, Sergio Díaz-Tendero, Departamento de Química, Módulo 13, Universidad Autónoma de Madrid, 28049 Madrid (Spain), Atomes, Molécules et Agrégats (AMA), Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), J. Heyrovský Institute of Physical Chemistry of the ASCR, Czech Academy of Sciences [Prague] (CAS), Centro de Computación Científica (CCC-UAM), Universidad Autónoma de Madrid (UAM), Siedlce University of Natural Sciences and Humanities, Departamento de Química, Modulo 13, Universidad Autónoma de Madrid, Instituto IMDEA Nanociencia [Madrid], Instituto Imdea Nanociencia, Institute for Advanced Research in Chemical Science (IAdChem) (IAdChem), and Departamento de Física Teórica de la Materia Condensada and Condensed Matter Physics Center (IFIMAC)
Subjects: [PHYS.PHYS.PHYS-ATM-PH]Physics [physics]/Physics [physics]/Atomic and Molecular Clusters [physics.atm-clus], General Physics and Astronomy, Physical and Theoretical Chemistry
Abstract: International audience; We present a combined experimental and theoretical study of the fragmentation of singly and doubly N-methylated glycine (sarcosine and N,N-dimethyl glycine, respectively) induced by low-energy (keV) O6+ ions. Multicoincidence mass spectrometry techniques and quantum chemistry simulations (ab initio molecular dynamics and density functional theory) allow us to characterise different fragmentation pathways as well as the associated mechanisms. We focus on the fragmentation of doubly ionised species, for which coincidence measurements provide unambiguous information on the origin of the various charged fragments. We have found that single N-methylation leads to a larger variety of fragmentation channels than in no methylation of glycine, while double N-methylation effectively closes many of these fragmentation channels, including some of those appearing in pristine glycine. Importantly, the closure of fragmentation channels in the latter case does not imply a protective effect by the methyl group.
Published: 2022

2. Methods in Molecular Biology

Author: Michele Cerminara, Instituto IMDEA Nanociencia [Madrid], Instituto Imdea Nanociencia, Physique des fonctions biologiques / Physics of Biological Functions, and Institut Pasteur [Paris] (IP)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)
Subjects: Infrared absorption, Millisecond, Protein Folding, Pump and Probe, Materials science, Temperature jump, Protein dynamics, [SDV]Life Sciences [q-bio], [SDV.BBM.BM]Life Sciences [q-bio]/Biochemistry, Molecular Biology/Molecular biology, Folding (DSP implementation), Nanosecond, Fluorescence spectroscopy, Fluorescence, Computational physics, Förster Resonance Energy Transfer, Protein folding, Folding Kinetics, Ultrashort pulse
Abstract: International audience; The development of ultrafast kinetic methods is one of the factors that allowed the research on protein folding to flourish over the last twenty years. The introduction of new optical triggering techniques enabled to experimentally investigate the protein dynamics at the nanosecond to millisecond timescale, allowing researchers to test theoretical predictions and providing experimental benchmarks for computer simulations. In this work the details of how to perform kinetic experiments by the laserinduced temperature jump technique, using the two most commonly used probing techniques (namely infrared absorption and fluorescence spectroscopy) are given, with a strong emphasis on the practical details.
Published: 2022

3. Photooxidation Responsive Elastin-Like Polypeptide Conjugates for Photodynamic Therapy Application

Author: Sébastien Lecommandoux, Vusala Ibrahimova, Manon Levêque, Tomás Torres, José Antonio González-Delgado, Elisabeth Garanger, Laboratoire de Chimie des Polymères Organiques (LCPO), Centre National de la Recherche Scientifique (CNRS)-Institut Polytechnique de Bordeaux-Ecole Nationale Supérieure de Chimie, de Biologie et de Physique (ENSCBP)-Université de Bordeaux (UB)-Institut de Chimie du CNRS (INC), Team 3 LCPO : Polymer Self-Assembly & Life Sciences, Centre National de la Recherche Scientifique (CNRS)-Institut Polytechnique de Bordeaux-Ecole Nationale Supérieure de Chimie, de Biologie et de Physique (ENSCBP)-Université de Bordeaux (UB)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Polytechnique de Bordeaux-Ecole Nationale Supérieure de Chimie, de Biologie et de Physique (ENSCBP)-Université de Bordeaux (UB)-Institut de Chimie du CNRS (INC), Universidad Autonoma de Madrid (UAM), Instituto IMDEA Nanociencia [Madrid], Instituto Imdea Nanociencia, European Project: EuroNanoMed III 2017,TEMPEAT, Université de Bordeaux (UB)-Ecole Nationale Supérieure de Chimie, de Biologie et de Physique (ENSCBP)-Institut Polytechnique de Bordeaux-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université de Bordeaux (UB)-Ecole Nationale Supérieure de Chimie, de Biologie et de Physique (ENSCBP)-Institut Polytechnique de Bordeaux-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Bordeaux (UB)-Ecole Nationale Supérieure de Chimie, de Biologie et de Physique (ENSCBP)-Institut Polytechnique de Bordeaux-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and Universidad Autónoma de Madrid (UAM)
Subjects: Biocompatibility, medicine.medical_treatment, Biomedical Engineering, Pharmaceutical Science, Bioengineering, Photodynamic therapy, 02 engineering and technology, Conjugated system, 010402 general chemistry, 01 natural sciences, chemistry.chemical_compound, Oxidants, Photochemical, medicine, Humans, Photosensitizer, [SDV.BBM]Life Sciences [q-bio]/Biochemistry, Molecular Biology, Micelles, Pharmacology, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Molecular Structure, Singlet oxygen, Organic Chemistry, 021001 nanoscience & nanotechnology, Combinatorial chemistry, Cycloaddition, 0104 chemical sciences, Elastin, [CHIM.POLY]Chemical Sciences/Polymers, chemistry, Photochemotherapy, Drug delivery, 0210 nano-technology, Peptides, Oxidation-Reduction, Biotechnology, Conjugate
Abstract: Stimuli-responsive recombinant elastin-like polypeptides (ELPs) are artificial protein polymers derived from the hydrophobic domain of tropoelastin that have attracted significant interest for drug delivery and tissue engineering applications. In the present study, we have conjugated a photosensitizer (PS) to a hydrophobic methionine-containing ELP scaffold, which upon reaction with singlet oxygen (1O2) is transformed into a hydrophilic sulfoxide derivative facilitating the disassembly of photosensitizer-delivery particles during the photodynamic therapy (PDT) process. A peripherally substituted carboxy-Zn(II)-phthalocyanine derivative (TT1) bearing a carboxyl group directly linked to the Pc-ring, and presenting an absorption maximum around 680 nm, was selected as PS which simultaneously acted as a photooxidation catalyst. A TT1-ELP[M1V3-40] conjugate was prepared from ELP[M1V3-40] modified with an alkyne group at the N-terminal chain end, and from TT1-amide-C3-azide by copper(I)-catalyzed alkyne-azide cycloaddition (CuAAC) reaction. This innovative model photooxidation sensitive PS delivery technology offers promising attributes in terms of temperature-controlled particle formation and oxidation-triggered release, narrow molar mass distribution, reproducibility, scalability, non-immunogenicity, biocompatibility, and biodegradability for pharmaceutical applications in an effort to improve the clinical effectiveness of PDT treatments.
Published: 2021

4. Tuning the load in gold and magnetic nanoparticles in nanogels through their design for enhanced dual magneto-photo-thermia

Author: Aude Michel, Claire Wilhelm, Esther Cazares-Cortes, Sandra Casale, Ali Abou-Hassan, Ana Espinosa, Jose E. Perez, Christine Ménager, PHysicochimie des Electrolytes et Nanosystèmes InterfaciauX (PHENIX), Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Matière et Systèmes Complexes (MSC (UMR_7057)), Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Instituto IMDEA Nanociencia [Madrid], Instituto Imdea Nanociencia, Laboratoire de Réactivité de Surface (LRS), and Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Materials science, Surface Properties, Nanogels, Nanotechnology, 02 engineering and technology, [CHIM.THER]Chemical Sciences/Medicinal Chemistry, 010402 general chemistry, 01 natural sciences, Catalysis, Heating, Materials Chemistry, Molecule, Particle Size, Magnetite Nanoparticles, Magneto, Molecular Structure, Metals and Alloys, General Chemistry, [CHIM.MATE]Chemical Sciences/Material chemistry, Photochemical Processes, 021001 nanoscience & nanotechnology, equipment and supplies, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Magnetic field, Magnetic Fields, [CHIM.POLY]Chemical Sciences/Polymers, Ceramics and Composites, Magnetic nanoparticles, Laser exposure, Nanorod, Gold, Particle size, 0210 nano-technology, [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft], human activities
Abstract: International audience; We describe a novel synthesis allowing one to enhance the load of magnetic nanoparticles and gold nanorods in nanogels. Two different structures, simple cores and core–shell, were synthesized and their heating properties upon alternating magnetic field or laser exposure are compared. Remarkably, the core–shell structure showed a greater heating capacity in the two modalities.
Published: 2021

5. Water Soluble Iron-Based Coordination Trimers as Synergistic Adjuvants for Pancreatic Cancer

Author: Marco Cordani, Lionel Salmon, Arturo Gamonal, Azzedine Bousseksou, Paula Milán-Rois, Esther Resines-Urien, Álvaro Somoza, José Sánchez Costa, Instituto IMDEA Nanociencia [Madrid], Instituto Imdea Nanociencia, Laboratoire de chimie de coordination (LCC), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie de Toulouse (ICT-FR 2599), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie de Toulouse (ICT), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), Spanish Ministry of Economy and Competitiveness (SAF2017-87305-R, CTQ2016-80635-P, RYC-2014-16866), Comunidad de Madrid (IND2017/IND-7809, PEJD-2017-PRE/IND-4037, P2018/NMT-4321), Asociación Española Contra el Cáncer, and IMDEA Nanociencia - ‘Severo Ochoa’ Programme for Centres of Excellence in R&D (MINECO, Grant SEV-2016-0686)
Subjects: 0301 basic medicine, Physiology, medicine.medical_treatment, Clinical Biochemistry, Triazole, [CHIM.THER]Chemical Sciences/Medicinal Chemistry, 010402 general chemistry, 01 natural sciences, Biochemistry, Article, Bioinorganic chemistry, 03 medical and health sciences, chemistry.chemical_compound, Downregulation and upregulation, Pancreatic cancer, medicine, [CHIM.COOR]Chemical Sciences/Coordination chemistry, Molecular Biology, PI3K/AKT/mTOR pathway, chemistry.chemical_classification, Reactive oxygen species, Antitumor agents, lcsh:RM1-950, Cell Biology, medicine.disease, Gemcitabine, 3. Good health, 0104 chemical sciences, Coordination polymers, 030104 developmental biology, lcsh:Therapeutics. Pharmacology, chemistry, Cell culture, Cancer research, Adjuvant, medicine.drug
Abstract: International audience; Pancreatic cancer is a usually fatal disease that needs innovative therapeutic approaches since the current treatments are poorly effective. In this study, based on cell lines, triazole-based coordination trimers made with soluble Fe(II) in an aqueous media were explored for the first time as adjuvant agents for the treatment of this condition. These coordination complexes were effective at relatively high concentrations and led to an increase in reactive oxygen species (ROS) in two pancreatic cancer cell lines, PANC-1 and BXPC-3, and this effect was accompanied by a significant reduction in cell viability in the presence of gemcitabine (GEM). Importantly, the tested compounds enhanced the effect of GEM, an approved drug for pancreatic cancer, through apoptosis induction and downregulation of the mTOR pathway. Although further evaluation in animal-based models of pancreatic cancer is needed, these results open novel avenues for exploring these iron-based materials in biomedicine in general and in pancreatic cancer treatment.
Published: 2021

6. Massive Intracellular Remodeling of CuS Nanomaterials Produces Nontoxic Bioengineered Structures with Preserved Photothermal Potential

Author: Aurore Van de Walle, Ara Sargsian, Alberto Curcio, Nicolas Menguy, Ali Abou-Hassan, Ana Espinosa, Nathalie Luciani, Bella B. Manshian, Aida Serrano, Emilia Benassai, Claire Wilhelm, Stefaan J. Soenen, Matière et Systèmes Complexes (MSC (UMR_7057)), Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Laboratoire Physico-Chimie Curie [Institut Curie] (PCC), Institut Curie [Paris]-Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), PHysicochimie des Electrolytes et Nanosystèmes InterfaciauX (PHENIX), Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), European Synchrotron Radiation Facility (ESRF), Instituto de Cerámica y Vidrio (ICV), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC), Institut de minéralogie, de physique des matériaux et de cosmochimie (IMPMC), Muséum national d'Histoire naturelle (MNHN)-Institut de recherche pour le développement [IRD] : UR206-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Catholic University of Leuven - Katholieke Universiteit Leuven (KU Leuven), Instituto IMDEA Nanociencia [Madrid], Instituto Imdea Nanociencia, Centro Nacional de Biotecnología [Madrid] (CNB-CSIC), Matière et Systèmes Complexes (MSC), Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), and Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPC)
Subjects: Technology, Chemistry, Multidisciplinary, COPPER, General Physics and Astronomy, Nanoparticle, 02 engineering and technology, [CHIM.THER]Chemical Sciences/Medicinal Chemistry, THERAPY, 01 natural sciences, biodegradation, TOXICITY, Nanomaterials, DISSOLUTION, General Materials Science, Chemistry, Physical, Chemistry, General Engineering, CuS nanoparticles, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, 3. Good health, Physical Sciences, Science & Technology - Other Topics, 0210 nano-technology, PROTEIN CORONA, Intracellular, magnetic nanoparticles, INTERPLAY, Biocompatibility, Materials Science, Materials Science, Multidisciplinary, Nanotechnology, Sulfides, 010402 general chemistry, INORGANIC NANOPARTICLES, biocompatibility, Viability assay, Nanoscience & Nanotechnology, Bioprocess, Science & Technology, photothermia, bioprocessing, IRON-OXIDE NANOPARTICLES, DEGRADATION, Photothermal therapy, Phototherapy, 0104 chemical sciences, Nanostructures, CELLS, Magnetic nanoparticles, Nanoparticles, biosynthesis, Copper
Abstract: Despite efforts in producing nanoparticles with tightly controlled designs and specific physicochemical properties, these can undergo massive nano-bio interactions and bioprocessing upon internalization into cells. These transformations can generate adverse biological outcomes and premature loss of functional efficacy. Hence, understanding the intracellular fate of nanoparticles is a necessary prerequisite for their introduction in medicine. Among nanomaterials devoted to theranostics is copper sulfide (CuS), which provides outstanding optical properties along with easy synthesis and low cost. Herein, we performed a long-term multiscale study on the bioprocessing of hollow CuS nanoparticles (CuS NPs) and rattle-like iron oxide nanoflowers@CuS core-shell hybrids (IONF@CuS NPs) when inside stem cells and cancer cells, cultured as spheroids. In the spheroids, both CuS NPs and IONF@CuS NPs are rapidly dismantled into smaller units (day 0 to 3), and hair-like nanostructures are generated (day 9 to 21). This bioprocessing triggers an adaptation of the cellular metabolism to the internalized metals without impacting cell viability, differentiation, or oxidative stress response. Throughout the remodeling, a loss of IONF-derived magnetism is observed, but, surprisingly, the CuS photothermal potential is preserved, as demonstrated by a full characterization of the photothermal conversion across the bioprocessing process. The maintained photothermal efficiency correlated well with synchrotron X-ray absorption spectroscopy measurements, evidencing a similar chemical phase for Cu but not for Fe over time. These findings evidence that the intracellular bioprocessing of CuS nanoparticles can reshape them into bioengineered nanostructures without reducing the photothermal function and therapeutic potential. ispartof: ACS NANO vol:15 issue:6 pages:9782-9795 ispartof: location:United States status: published
Published: 2021

7. Assessing the parameters modulating optical losses of iron oxide nanoparticles under near infrared irradiation

Author: Francisco J. Teran, Begoña Sot, Cristina Blanco-Andujar, Sylvie Begin-Colin, Gorka Salas, Elena Plaza-Mayoral, Ana Espinosa, Geoffrey Cotin, Claudia Lozano-Pedraza, Delphine Felder-Flesch, Aida Serrano, Instituto IMDEA Nanociencia [Madrid], Instituto Imdea Nanociencia, Consejo Superior de Investigaciones Científicas [Madrid] (CSIC), Instituto de Cerámica y Vidrio (ICV), Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), Université de Strasbourg (UNISTRA)-Matériaux et nanosciences d'Alsace (FMNGE), Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et Nanosciences Grand-Est (MNGE), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), and univOAK, Archive ouverte
Subjects: Materials science, [SPI.OPTI] Engineering Sciences [physics]/Optics / Photonic, Nanoparticle, Bioengineering, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, Crystal, chemistry.chemical_compound, Crystallinity, Colloid, Oxidation state, General Materials Science, Irradiation, Magnetite, General Engineering, General Chemistry, 021001 nanoscience & nanotechnology, Atomic and Molecular Physics, and Optics, 0104 chemical sciences, 3. Good health, chemistry, Chemical engineering, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, 0210 nano-technology, Iron oxide nanoparticles
Abstract: Heating mediated by iron oxide nanoparticles subjected to near infrared irradiation has recently gained lots of interest. The high optical loss values reported in combination with the optical technologies already existing in current clinical practices, have made optical heating mediated by iron oxide nanoparticles an attractive choice for treating internal or skin tumors. However, the identification of the relevant parameters and the influence of methodologies for quantifying the optical losses released by iron oxide nanoparticles are not fully clear. Here, we report on a systematic study of different intrinsic (size, shape, crystallinity, and iron oxidation state) and extrinsic (aggregation, concentration, intracellular environment and irradiation conditions) parameters involved in the photothermal conversion of iron oxide nanoparticles under near infrared irradiation. We have probed the temperature increments to determine the specific loss power of iron oxide nanoparticles with different sizes and shapes dispersed in colloidal suspensions or inside live breast cancer cells. Our results underline the relevance of crystal surface defects, aggregation, concentration, magnetite abundance, excitation wavelength and density power on the modulation of the photothermal conversion. Contrary to plasmonic or magnetic losses, no significant influence of nanoparticle size nor shape was observed on the optical losses released by the studied iron oxide nanoparticles. Interestingly, no significant differences of measured temperature increments and specific loss power values were either observed when nanoparticles were inside live cells or in colloidal dispersion. Our findings highlight the advantages of optical heat losses released by iron oxide nanoparticles for therapeutic applications.
Published: 2021

8. Engineering the spin conversion in graphene monolayer epitaxial structures

Author: Iciar Arnay, Jose Manuel Díez Toledano, Paolo Perna, Alejandra Guedeja-Marrón, Juan-Carlos Rojas-Sánchez, Pilar Jiménez-Cavero, F. Ajejas, M. R. Ibarra, Irene Lucas, Pedro A. Algarabel, A. Anadón, Sébastien Petit-Watelot, Luis Morellón, Rodolfo Miranda, Maria Varela, Ruben Guerrero, Adrian Gudin, Julio Camarero, UAM.Departamento de Física de la Materia Condensada, Centro de Investigación en Física de la Materia Condensada (IFIMAC), Instituto Universitario de Ciencia de Materiales Nicolás Cabrera (INC), IMDEA Nanociencia (IMDEA), Instituto IMDEA Nanociencia [Madrid], Instituto Imdea Nanociencia, Instituto de Nanociencia de Aragón, Universidad de Zaragoza, Institut Jean Lamour (IJL), Université de Lorraine (UL)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and ANR-19-CE24-0016,TOPTRONIC,Topological spin-orbitronique(2019)
Subjects: Materials science, 02 engineering and technology, Epitaxy, Iridium, 01 natural sciences, 7. Clean energy, law.invention, Symmetry, law, 0103 physical sciences, Monolayer, General Materials Science, 010306 general physics, Film, Spin-½, Coupling, Condensed matter physics, Spintronics, Física de materiales, Graphene, General Engineering, Orbit Torques, Física, 021001 nanoscience & nanotechnology, [PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other], Física del estado sólido, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Sapphire, Electric-Field Control, Condensed Matter::Strongly Correlated Electrons, 0210 nano-technology, Layer (electronics)
Abstract: International audience; Spin Hall and Rashba–Edelstein effects, which are spin-to-charge conversion phenomena due to spin-orbit coupling (SOC), are attractingincreasing interest as pathways to manage rapidly and at low consumption cost the storage and processing of a large amount of data inspintronic devices as well as more efficient energy harvesting by spin-caloritronics devices. Materials with large SOC, such as heavy metals(HMs), are traditionally employed to get large spin-to-charge conversion. More recently, the use of graphene (gr) in proximity with largeSOC layers has been proposed as an efficient and tunable spin transport channel. Here, we explore the role of a graphene monolayer betweenCo and a HM and its interfacial spin transport properties by means of thermo-spin measurements. The gr/HM (Pt and Ta) stacks have beenprepared on epitaxial Ir(111)/Co(111) structures grown on sapphire crystals, in which the spin detector (i.e., top HM) and the spin injector(i.e., Co) are all grown in situ under controlled conditions and present clean and sharp interfaces. We find that a gr monolayer retains the spincurrent injected into the HM from the bottom Co layer. This has been observed by detecting a net reduction in the sum of the spin Seebeckand interfacial contributions due to the presence of gr and independent from the spin Hall angle sign of the HM used.Invited Paper published as part of the special topic on Emerging Materials for Spin-Charge Interconversion
Published: 2021

9. 2D and 3D Ruthenium Nanoparticle Covalent Assemblies for Phenyl Acetylene Hydrogenation

Author: Andrea Falqui, Beatriz María Illescas Martínez, Pierre Roblin, M. Rosa Axet, Philippe Serp, Thomas Theussl, Silverio Coco, Nazario Martín, Hervé Martinez, Yuanyuan Min, Pierre Lecante, María Barcenilla, Alberto Casu, Bruno F. Machado, Faqiang Leng, Laboratoire de chimie de coordination (LCC), Institut de Chimie de Toulouse (ICT), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), Laboratory of Separation and Reaction Engineering - Laboratory of Catalysis and Materials (LSRE-LCM), Faculdade de Engenharia (LSRE-LCM), Universidade do Porto = University of Porto, Centre d'élaboration de matériaux et d'études structurales (CEMES), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut de Chimie de Toulouse (ICT), Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Laboratoire de Génie Chimique (LGC), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT), Université de Pau et des Pays de l'Adour (UPPA), King Abdullah University of Science and Technology (KAUST), Universidad de Valladolid [Valladolid] (UVa), Departamento de Química Orgánica I, Facultad de Química, Universidad Complutense, Universidad Complutense de Madrid = Complutense University of Madrid [Madrid] (UCM), Instituto IMDEA Nanociencia [Madrid], Instituto Imdea Nanociencia, Centre National de la Recherche Scientifique (CNRS), Institut National Polytechnique (INP), ANR-16-CE07-0007,ICARE_1,Nanostrucutres métal@carbone innovante pour une catalyse durable(2016), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie de Toulouse (ICT-FR 2599), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Universidade do Porto, Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie de Toulouse (ICT-FR 2599), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Institut national de recherche pour l'agriculture, l'alimentation et l'environnement - INRAE (FRANCE), Institut National des Sciences Appliquées de Toulouse - INSA (FRANCE), King Abdullah University of Science and Technology - KAUST (SAUDI ARABIA), Office National d'Etudes et Recherches Aérospatiales - ONERA (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Universidad Complutense de Madrid - UCM (SPAIN), Université de Pau et des Pays de l'Adour - UPPA (FRANCE), Universidade do Porto - UP (PORTUGAL), and Centre d'Elaboration de Matériaux et d'Etudes Structurales - CEMES (Toulouse, France)
Subjects: Triphenylene, chemistry.chemical_element, Nanoparticle, 010402 general chemistry, 01 natural sciences, Ruthenium, Catalysis, Styrene, Inorganic Chemistry, chemistry.chemical_compound, [CHIM.GENI]Chemical Sciences/Chemical engineering, Génie chimique, [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering, Génie des procédés, Covalent assembly, 010405 organic chemistry, Combinatorial chemistry, Acetylene hydrogenation, 0104 chemical sciences, Metallic nanoparticles, chemistry, Phenylacetylene, Covalent bond, Selectivity, Confinement effect
Abstract: International audience; The bottom‐up covalent assembly of metallic nanoparticles (NP) represents one of the innovative tools in nanotechnology to build functional heterostructures, with the resulting assemblies showing superior collective properties over the individual NP for a broad range of applications. The ability to control the dimensionality of the assembly is one of the major challenges in designing and understanding these advanced materials. Here, two new organic linkers were used as building blocks in order to guide the organization of Ru NP into two‐ or three‐dimensional covalent assemblies. The use of a hexa‐adduct functionalized C60 leads to the formation of 3D networks of 2.2 nm Ru NP presenting an interparticle distance of 3.0 nm, and the use of a planar carboxylic acid triphenylene derivative allows the synthesis of 2D networks of 1.9 nm Ru NP with an interparticle distance of 3.1 nm. The Ru NP networks were found to be active catalysts for the selective hydrogenation of phenylacetylene, reaching good selectivity toward styrene. Overall, we demonstrated that catalyst performances are significantly affected by the dimensionality (2D vs. 3D) of the heterostructures, which can be rationalize based on confinement effects.
Published: 2020

10. Synthesis of metal-free lightweight materials with sequence-encoded properties

Author: Jesús Barrio, Pilar Amo-Ochoa, Jonathan Tzadikov, Adi Azoulay, Félix Zamora, Michael Volokh, Josep Albero, Christel Gervais, Menny Shalom, Hermenegildo García, Department of Chemistry and Ilse Katz Institute for Nanoscale Science and Technology, Ben-Gurion University of the Negev (BGU), Instituto de Tecnologia Quimica UPV-CSIC - Universidad Politecnica de Valencia, Universitat Politècnica de València (UPV), Spectroscopie, Modélisation, Interfaces pour L'Environnement et la Santé (LCMCP-SMiLES), Laboratoire de Chimie de la Matière Condensée de Paris (LCMCP), Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Condensed Matter Physics Center (IFIMAC), Instituto IMDEA Nanociencia [Madrid], Instituto Imdea Nanociencia, the Minerva Center No. 117873, the Spanish Ministerio de Economía y Competitividad (MAT2016-77608-C3-1-P, MAT2016-75883-C2-2-P), the Spanish Ministry of Economy and Competitiveness (Severo Ochoa SEV2016-0683 and RTI2018-89023-CO2-R1) and the Generalitat Valenciana (Prometeo 2017–083), the Planning & Budgeting Committee/Israel Council for Higher Education (CHE) and Fuel Choice Initiative (Prime Minister Office of Israel), within the framework of 'Israel National Research Center for Electrochemical Propulsion' (INREP), the European Union’s Horizon 2020 research and innovation programme (grant agreement No. [849068]), GENCI-IDRIS (Grant 097535), The French Region Ile de France-SESAME program is acknowledged for financial support (700 MHz spectrometer), Ministerio de Economía y Competitividad (España), Generalitat Valenciana, and European Research Council
Subjects: Materials science, Heteroatom, Sequence (biology), 02 engineering and technology, 010402 general chemistry, 01 natural sciences, 7. Clean energy, law.invention, Catalysis, chemistry.chemical_compound, QUIMICA ORGANICA, law, General Materials Science, Calcination, Thermal stability, Phosphoric acid, Renewable Energy, Sustainability and the Environment, General Chemistry, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Monomer, chemistry, Chemical engineering, Atomic ratio, 0210 nano-technology
Abstract: A high-temperature solid-state synthesis is a widespread tool for the construction of metal-free materials, owing to its simplicity and scalability. However, no method is currently available for the synthesis of metal-free materials, which enables control over the atomic ratio and spatial organization of several heteroatoms. Here we report a general and large-scale synthesis of phosphorus-nitrogen-carbon (PNC) materials with highly controllable elemental composition and structural, electronic, and thermal stability properties. To do so, we designed four different crystals consisting of melamine and phosphoric acid with different monomers sequences as the starting precursors. The monomer sequence of the crystals is preserved upon calcination (up to 800 °C) to an unprecedented degree, which leads to precise control over the composition of the final PNC materials. The latter exhibit a remarkable stability up to 970 °C in air, positioning them as sustainable, lightweight supports for catalysts in high-temperature reactions as well as halogen-free fire-retardant materials., The authors would like to thank Dr Volodiya Ezersky, Dr Natalya Froumin, Dr Anna Milionshchik, Dr Radion Vainer, Dr Einat Nativ-Roth, and Mr Nitzan Shauloff for analytical HRTEM, XPS, TGA, SC-XRD, HRSEM, and technical support, respectively. This research was partly funded by the following: the Planning & Budgeting Committee/Israel Council for Higher Education (CHE) and Fuel Choice Initiative (Prime Minister Office of Israel), within the framework of “Israel National Research Center for Electrochemical Propulsion” (INREP); the Minerva Center No. 117873; the Spanish Ministerio de Economía y Competitividad (MAT2016-77608-C3-1-P, MAT2016-75883-C2-2-P); J. A. and H. G. also gratefully acknowledges financial support from the Spanish Ministry of Economy and Competitiveness (Severo Ochoa SEV2016-0683 and RTI2018-89023-CO2-R1) and by the Generalitat Valenciana (Prometeo 2017-083). This project has received funding from the European Research Council (ERC) under the European Union's Horizon 2020 Research and Innovation Programme (grant agreement No. [849068]). NMR spectroscopic calculations were performed using HPC resources from GENCI-IDRIS (Grant 097535). The French Region Ile de France-SESAME program is acknowledged for financial support (700 MHz spectrometer).
Published: 2020

11. Spin crossover in Fe(triazole)-Pt nanoparticle self-assembly structured at the sub-5 nm scale

Author: Phillipe Demont, Benedikt Lassalle-Kaiser, José Sánchez Costa, Suhail Usmani, Mirko Mikolasek, Gábor Molnár, Azzedine Bousseksou, Mathilde Rigoulet, Bruno Chaudret, Angélique Gillet, Simon Tricard, Julian Carrey, Lionel Salmon, Laboratoire de physique et chimie des nano-objets (LPCNO), Institut de Recherche sur les Systèmes Atomiques et Moléculaires Complexes (IRSAMC), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie de Toulouse (ICT-FR 2599), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC), Laboratoire de chimie de coordination (LCC), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie de Toulouse (ICT-FR 2599), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), European Synchrotron Radiation Facility (ESRF), Instituto IMDEA Nanociencia [Madrid], Instituto Imdea Nanociencia, Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Centre interuniversitaire de recherche et d'ingenierie des matériaux (CIRIMAT), Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC), Centre National de la Recherche Scientifique - CNRS (FRANCE), European Synchrotron Radiation Facility - ESRF (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Institut National des Sciences Appliquées de Toulouse - INSA (FRANCE), Synchrotron SOLEIL - SSOLEIL (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Universidad Autonoma de Madrid (SPAIN), Centre Interuniversitaire de Recherche et d'Ingénierie des Matériaux - CIRIMAT (Toulouse, France), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie de Toulouse (ICT-FR 2599), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut de Chimie de Toulouse (ICT), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche sur les Systèmes Atomiques et Moléculaires Complexes (IRSAMC), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie de Toulouse (ICT), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), Université de Toulouse (UT), Marie-Curie research program (NanoSCOpe 328078), Indo-French Centre for the Promotion of Advanced Research - CEFIPRA, Spanish MINECO - National Research Project (CTQ2016-80635-P), Ramon y Cajal Research program (RYC-2014-16866), ANR-10-LABX-0037,NEXT,Nano, EXtreme Measurements & Theory(2010), ANR-18-CE09-0007,MOSC,Chimie supraparticulaire orientée par des molécules(2018), ANR-13-BS07-0020,NanoHybrid,Nanostructures hybrides bistables(2013), and ANR-17-EURE-0009,NanoX,Science et Ingénierie à l'Echelle Nano(2017)
Subjects: Materials science, Matériaux, Population, Infrared spectroscopy, Nanoparticle, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, [SPI.MAT]Engineering Sciences [physics]/Materials, [CHIM.GENI]Chemical Sciences/Chemical engineering, Spin crossover, Molecule, Génie chimique, General Materials Science, [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering, education, Génie des procédés, Molecular switch, education.field_of_study, Molecular electronics, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Chemical physics, Self-assembly, 0210 nano-technology
Abstract: International audience; A main goal of molecular electronics is to relate the performance of devices to the structure and electronic state of molecules. Among the variety of possibilities that organic, organometallic and coordination chemistries offer to tune the energy levels of molecular components, spin crossover phenomenon is a perfect candidate for elaboration of molecular switches. The reorganization of the electronic state population of the molecules associated to the spin crossover can indeed lead to a significant change in conductivity. However, molecular spin crossover is very sensitive to the environment and can disappear once the molecules are integrated into devices. Here, we show that the association of ultra-small 1.2 nm platinum nanoparticles with FeII triazole-based spin crossover coordination polymers leads to self-assemblies, extremely well organized at the sub-3 nm scale. The quasi-perfect alignment of nanoparticles observed by transmission electron microscopy, in addition to specific signature in infrared spectroscopy, demonstrates the coordination of the long-chain molecules with the nanoparticles. Spin crossover is confirmed in such assemblies by X-ray absorption spectroscopic measurements and shows unambiguous characteristics both in magnetic and charge transport measurements. Coordinating polymers are therefore ideal candidates for the elaboration of robust, well-organized, hybrid self-assemblies with metallic nanoparticles, while maintaining sensitive functional properties, such as spin crossover.
Published: 2020

12. Non-aromatic carbonaceous species formed in the circumstellar innerlayers of evolved stars

Author: Martínez, Lidia, Santoro, Gonzalo, Merino, Pablo, Accolla, Mario, Lauwaet, Koen, Sobrado, Jesús, Sabbah, Hassan, Pelaez, Ramón, Herrero, Victor, Tanarro, Isabel, Agúndez, Marcelino, Martín-Jimenez, Alberto, Otero, Roberto, Ellis, Gary, Joblin, Christine, Cernicharo, José, Martín-Gago, José, Instituto de Ciencia de Materiales de Madrid (ICMM), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC), Instituto de Física Fundamental [Madrid] (IFF), Instituto IMDEA Nanociencia [Madrid], Instituto Imdea Nanociencia, Centro de Astrobiologia [Madrid] (CAB), Instituto Nacional de Técnica Aeroespacial (INTA)-Consejo Superior de Investigaciones Científicas [Madrid] (CSIC), Institut de recherche en astrophysique et planétologie (IRAP), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Laboratoire Collisions Agrégats Réactivité (LCAR), Institut de Recherche sur les Systèmes Atomiques et Moléculaires Complexes (IRSAMC), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), Instituto de Estructura de la Materia (IEM), Instituto de Ciencia y Tecnologia de Polimeros (ICTP-CSIC), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC)-Instituto Nacional de Técnica Aeroespacial (INTA), Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS), Instituto de Ciencia y Tecnologia de Polimeros (CSIC), Instituto de Ciencia y Tecnología de Polímeros, Météo-France -Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Université Fédérale Toulouse Midi-Pyrénées-Centre National d'Études Spatiales [Toulouse] (CNES)-Météo-France -Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), and Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3)
Subjects: [CHIM]Chemical Sciences, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], ComputingMilieux_MISCELLANEOUS
Abstract: International audience
Published: 2020

13. Divergent Adsorption-Dependent Luminescence of Amino-Functionalized Lanthanide Metal-Organic Frameworks for Highly Sensitive NO2 Sensors

Author: José Sánchez Costa, Estefania Fernandez-Bartolome, Roberta Poloni, Bess Vlaisavljevich, Juan Cabanillas-Gonzalez, Elena Guerrero-SanVicente, Reinhold Wannemacher, Javier Castells-Gil, Chen Sun, Carlos Martí-Gastaldo, Arturo Gamonal, A. Lorenzo Mariano, Instituto IMDEA Nanociencia [Madrid], Instituto Imdea Nanociencia, Science et Ingénierie des Matériaux et Procédés (SIMaP), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), University of South Dakota [Vermillion] (USD), Instituto de Ciencia Molecular (ICMol), and Universitat de València (UV)
Subjects: Lanthanide, Ions, Photoluminescence, Luminescence, Chemistry, Ligand, Ab initio, Metal organic frameworks, 02 engineering and technology, [CHIM.MATE]Chemical Sciences/Material chemistry, Molecules, 010402 general chemistry, 021001 nanoscience & nanotechnology, Photochemistry, Ligands, 01 natural sciences, 0104 chemical sciences, [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, Adsorption, General Materials Science, Metal-organic framework, Physical and Theoretical Chemistry, Isostructural, 0210 nano-technology
Abstract: International audience; A novel gas sensing mechanism exploiting lanthanide luminescence modulation upon NO2 adsorption is demonstrated here. Two isostructural lanthanide-based metal–organic frameworks (MOFs) are used, including an amino group as the sensitive recognition center for NO2 molecules. The transfer of energy from the organic ligands to Ln is strongly dependent on the presence of NO2, resulting in an unprecedented photoluminescent sensing scheme. Thereby, NO2 exposition triggers either a reversible enhancement or a decrease in the luminescence intensity, depending on the lanthanide ion (Eu or Tb). Our experimental studies combined with density functional theory and complete active space self-consistent field calculations provide an understanding of the nature and effects of NO2 interactions within the MOFs and the signal transduction mechanism.
Published: 2020

14. Epitaxial strain and thickness dependent structural, electrical and magnetic properties of La0.67Sr0.33MnO3films

Author: Julio Camarero, Fernando Ajejas, Paolo Perna, Stéphane Flament, Sandeep-Kumar Chaluvadi, Laurence Méchin, S Lebargy, Pasquale Orgiani, Albert Minj, Equipe Electronique - Laboratoire GREYC - UMR6072, Groupe de Recherche en Informatique, Image et Instrumentation de Caen (GREYC), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU), Universidad Autonoma de Madrid (UAM), CNR Istituto Officina dei Materiali (IOM), Consiglio Nazionale delle Ricerche [Roma] (CNR), Departamento de Fisica de la Materia Condensada [Madrid] (FMC), Facultad de Ciencas [Madrid], Universidad Autonoma de Madrid (UAM)-Universidad Autonoma de Madrid (UAM), Instituto IMDEA Nanociencia [Madrid], Instituto Imdea Nanociencia, and UAM. Departamento de Física de la Materia Condensada
Subjects: Materials science, Acoustics and Ultrasonics, 02 engineering and technology, Substrate (electronics), manganites, Epitaxy, 01 natural sciences, Pulsed laser deposition, Crystal, Pulsed Laser Deposition, strain, Manganites, 0103 physical sciences, Epitaxial Strain, Thin film, 010306 general physics, pulsed laser deposition, Thin Films, spintronics, magnetic anisotropy, Spintronics, Condensed matter physics, Física, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Magnetic Anisotropy, [SPI.TRON]Engineering Sciences [physics]/Electronics, Magnetic anisotropy, epitaxial strain, thin films, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 0210 nano-technology, Single crystal
Abstract: International audience; The crystal structural quality and the strain induced by the substrate strictly impose the magnetic and transport properties of La0.67Sr0.33MnO3 (LSMO) films. In particular, the magnetic anisotropy (MA) of epitaxial LSMO can be finely tuned by varying its thickness and by choosing single crystal substrates with suitable lattice mismatch with the film. Here, we have deposited LSMO films with thicknesses in the 12-50 nm range by pulsed laser deposition on different single crystal substrates inducing either compressive or tensile in-plane strain on the manganites. The epitaxial quality of films was quantified by ω-scans around (002) peak with full-width half-maximum (FWHM) values as low as 0.08° for films on the nearly matched NGO (110) substrate to 1.4° films on high mismatched MgO (001) substrate. As the epitaxial strain in thin-film increases, a significant reduction in metal-insulation transition (MIT) temperature (Tp) was observed. The magnetic properties of the films probed by Kerr magnetometry show that the symmetry of the room temperature MA varies significantly as a function of both strain and thickness. Specifically, we observed pure uniaxial MA on NGO (110) and pure biaxial MA on STO buffered MgO (001), whereas a spin reorientation from uniaxial in-plane to out-of-plane on LSAT (001) and uniaxial to nearly isotropic in-plane on STO (001) substrate as the film thickness is increased. We provide an efficient tool to tune the MA according to the specific spintronic application targeted.
Published: 2020

15. The phenotype of target pancreatic cancer cells influences cell death by magnetic hyperthermia with nanoparticles carrying gemicitabine and the pseudo-peptide NucAnt

Author: Pierre Couleaud, Yuri Volkov, Adriele Prina-Mello, Alfonso Latorre, José Courty, Mourad Sanhaji, Julia Göring, Álvaro Somoza, Aitziber L. Cortajarena, Rodolfo Miranda, Ingrid Hilger, Marcus Stapf, Robert Ludwig, Antonio Aires, Croissance cellulaire, réparation et régénération tissulaires (CRRET), Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), Centre for Research on Adaptive Nanostructures and Nanodevices, Trinity College Dublin, Institutfür DiagnostischeundInterventionelle RadiologieI, Friedrich-Schiller-Universität = Friedrich Schiller University Jena [Jena, Germany], Laboratoire CRRET, EAC/CNRS-7149, Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12), Instituto IMDEA Nanociencia [Madrid], and Instituto Imdea Nanociencia
Subjects: Cell, Pharmaceutical Science, Medicine (miscellaneous), Apoptosis, 02 engineering and technology, Deoxycytidine, S Phase, Pancreatic tumor, Cytotoxic T cell, General Materials Science, Magnetite Nanoparticles, ComputingMilieux_MISCELLANEOUS, 0303 health sciences, Chemistry, 021001 nanoscience & nanotechnology, 3. Good health, Tumor Burden, medicine.anatomical_structure, Phenotype, Molecular Medicine, [SDV.IB]Life Sciences [q-bio]/Bioengineering, 0210 nano-technology, medicine.drug, Programmed cell death, Biomedical Engineering, NucAnt (N6L), Mice, Nude, Bioengineering, [SDV.CAN]Life Sciences [q-bio]/Cancer, Mouse model, 03 medical and health sciences, Pancreatic cancer, Cell Line, Tumor, medicine, Animals, Humans, Magnetic hyperthermia, Gemcitabine (Gem), 030304 developmental biology, Cell Proliferation, Magnetic nanoparticles (MNP), JNK Mitogen-Activated Protein Kinases, Cell Cycle Checkpoints, Hyperthermia, Induced, medicine.disease, Xenograft Model Antitumor Assays, Gemcitabine, Pancreatic Neoplasms, Ki-67 Antigen, Cell culture, Cancer research, Peptides
Abstract: International audience; In this paper we show that conjugation of magnetic nanoparticles (MNPs) with Gemcitabine and/or NucAnt (N6L) fostered their internalization into pancreatic tumor cells and that the coupling procedure did not alter the cytotoxic potential of the drugs. By treating tumor cells (BxPC3 and PANC-1) with the conjugated MNPs and magnetic hyperthermia (43°C, 60 min), cell death was observed. The two pancreatic tumor cell lines showed different reactions against the combined therapy according to their intrinsic sensitivity against Gemcitabine (cell death, ROS production, ability to activate ERK 1/2 and JNK). Finally, tumors (e.g. 3 mL) could be effectively treated by using almost 4.2 × 10 5 times lower Gemcitabine doses compared to conventional therapies. Our data show that this combinatorial therapy might well play an important role in certain cell phenotypes with low readiness of ROS production. This would be of great significance in distinctly optimizing local pancreatic tumor treatments.
Published: 2019

16. A switchable iron-based coordination polymer toward reversible acetonitrile electro-optical readout

Author: Estefania Fernandez-Bartolome, Miguel Ángel García García-Tuñón, Roberta Poloni, Simon J. Teat, Esther Resines-Urien, José Sánchez Costa, Enrique Burzurí, Patricia de la Presa, Science et Ingénierie des Matériaux et Procédés (SIMaP ), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Instituto IMDEA Nanociencia [Madrid], Instituto Imdea Nanociencia, Ministerio de Economía y Competitividad (España), Comunidad de Madrid, and European Commission
Subjects: Materials science, Polymers, Coordination polymer, Nanotechnology, 010402 general chemistry, Sensor devices, 01 natural sciences, Crystal, chemistry.chemical_compound, Responsivity, Desorption, [CHIM]Chemical Sciences, [CHIM.COOR]Chemical Sciences/Coordination chemistry, Volatile organic compounds, Physics::Chemical Physics, Acetonitrile, Porosity, ComputingMilieux_MISCELLANEOUS, chemistry.chemical_classification, 010405 organic chemistry, Volatile acetonitrile, General Chemistry, Polymer, 0104 chemical sciences, Chemistry, chemistry, Iron based, Chemical Sciences
Abstract: [EN] Efficient and low cost detection of harmful volatile organic compounds (VOCs) is a major health and environmental need in industrialized societies. For this, tailor-made porous coordination polymers are emerging as promising molecular sensing materials thanks to their responsivity to a wide variety of external stimuli and could be used to complement conventional sensors. Here, a non-porous crystalline 1D Fe(ii) coordination polymer acting as a porous acetonitrile host is presented. The desorption of interstitial acetonitrile is accompanied by magneto-structural transitions easily detectable in the optical and electronic properties of the material. This structural switch and therefore its (opto)electronic readout are reversible under exposure of the crystal to acetonitrile vapor. This simple and robust iron-based coordination polymer could be ideally suited for the construction of multifunctional sensor devices for volatile acetonitrile and potentially for other organic compounds., JSC acknowledges funds from the Spanish MINECO through the National Research Project (CTQ2016-80635-P), the Ramon y Cajal Research Program (RYC-2014-16866), the Comunidad de Madrid (PEJD-2017-PRE/IND-4037) and the NANOMAGCOST (P2018/NMT-4321). EB acknowledges funds from the MSCA-IF European Commission programme (746579) and Programa de Atracción del Talento Investigador de la Comunidad de Madrid (2017-T1/IND-5562). IMDEA Nanociencia acknowledges support from the ‘Severo Ochoa’ Programme for Centres of Excellence in R&D (MINECO, Grant SEV-2016-0686). This research used resources of the Advanced Light Source, which is a DOE Office of Science User Facility under contract no. DE-AC02-05CH11231. We acknowledge the XALOC-ALBA synchrotron source under project 2018012561. PP acknowledges financial support from the Spanish MINECO project MAT2015-67557-C2-1-P. DFT calculations were performed using resources granted by the GENCI under the CINES Grant Nos. A0020907211 and A0040907211. Additionally, the Froggy platform of the CIMENT infrastructure was employed. We thank Dr J. Perles and Dr M. Ramírez for collection and analysis of the X-ray data at the SIDI (Universidad Autonoma de Madrid).
Published: 2019

17. Regime shifts of Mediterranean forest carbon uptake and reduced resilience driven by multidecadal ocean surface temperatures

Author: Carnicer Cols, Jofre, Domingo‐, Marimon, Cristina, Ninyerola, Miquel, Camarero Martínez, Jesús Julio, Bastos, Ana, López‐, Parages,Jorge, Blanquer, Laura, Rodríguez‐, Fonseca, Belén, Lenton, Timothy M., Dakos, Valisis, Ribas, Montserrat, Gutiérrez Merino, Emilia, Peñuelas, Josep, Pons, Xavier, Instituto IMDEA Nanociencia [Madrid], Instituto Imdea Nanociencia, Instituto de Geociências, Universidade Federal do Rio Grande do Sul [Porto Alegre] (UFRGS), Institut des Sciences de l'Evolution de Montpellier (UMR ISEM), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Montpellier (UM)-Institut de recherche pour le développement [IRD] : UR226-Centre National de la Recherche Scientifique (CNRS), European Organization for Nuclear Research (CERN), Olff group, Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-École Pratique des Hautes Études (EPHE), École pratique des hautes études (EPHE), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Montpellier (UM)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre National de la Recherche Scientifique (CNRS)-Institut de recherche pour le développement [IRD] : UR226
Subjects: 0106 biological sciences, Mediterranean climate, 010504 meteorology & atmospheric sciences, regime shift, Climate, Biome, Forests, Atmospheric sciences, 01 natural sciences, Carbon sink, Pins, forest, carbon sink, Regime shift, Atlantic Ocean, DROUGHT, General Environmental Science, Global and Planetary Change, TREE GROWTH, Ecology, Boscos, LARGE-SCALE, Temperature, VARIABILITY, [SDE]Environmental Sciences, SEMIARID ECOSYSTEMS, PACIFIC, Atmospheric circulation, Oceans and Seas, 010603 evolutionary biology, Effects of global warming, Multidecadal drought, Atlantic multidecadal oscillation, Environmental Chemistry, PINUS-HALEPENSIS, Forest, Espanya, climate, resilience, Carboni, 0105 earth and related environmental sciences, EUROPEAN CLIMATE, OSCILLATION, Resilience, 15. Life on land, Carbon, Pine, NORTH-ATLANTIC, 13. Climate action, North Atlantic oscillation, Spain, Environmental science, multidecadal drought
Abstract: imbalance-p paper contact with j.carnicer@creaf.uab.cat The mechanisms translating global circulation changes into rapid abrupt shifts in forest carbon capture in semi-arid biomes remain poorly understood. Here, we report unprecedented multidecadal shifts in forest carbon uptake in semi-arid Mediterranean pine forests in Spain over 1950-2012. The averaged carbon sink reduction varies between 31% and 37%, and reaches values in the range of 50% in the most affected forest stands. Regime shifts in forest carbon uptake are associated with climatic early warning signals, decreased forest regional synchrony and reduced long-term carbon sink resilience. We identify the mechanisms linked to ocean multidecadal variability that shape regime shifts in carbon capture. First, we show that low-frequency variations of the surface temperature of the Atlantic Ocean induce shifts in the non-stationary effects of El Niño Southern Oscillation (ENSO) on regional forest carbon capture. Modelling evidence supports that the non-stationary effects of ENSO can be propagated from tropical areas to semi-arid Mediterranean biomes through atmospheric wave trains. Second, decadal changes in the Atlantic Multidecadal Oscillation (AMO) significantly alter sea-air heat exchanges, modifying in turn ocean vapour transport over land and land surface temperatures, and promoting sustained drought conditions in spring and summer that reduce forest carbon uptake. Third, we show that lagged effects of AMO on the winter North Atlantic Oscillation also contribute to the maintenance of long-term droughts. Finally, we show that the reported strong, negative effects of ocean surface temperature (AMO) on forest carbon uptake in the last decades are unprecedented over the last 150 years. Our results provide new, unreported explanations for carbon uptake shifts in these drought-prone forests and review the expected impacts of global warming on the profiled mechanisms.
Published: 2019

18. Photoinduced effects on the magnetic properties of the (Fe0.2Cr0.8)1.5[Cr(CN)6] Prussian blue analogue

Author: I.A. Kowalik, Juan José de Miguel, M. A. Niño, Helena Prima-García, Dimitri Arvanitis, Francisco M. Romero, Eugenio Coronado, Juan P. Prieto-Ruiz, Francisco Jesús Luque, Corine Mathonière, Rodolfo Miranda, Institute of Physics [Warsaw] (IFPAN), Polish Academy of Sciences (PAN), Instituto de Ciencia Molecular (ICMol), Universitat de València (UV), Instituto IMDEA Nanociencia [Madrid], Instituto Imdea Nanociencia, Department of Physics and Astronomy [Uppsala], Uppsala University, Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Condensed Matter Physics Center (IFIMAC), Instituto de Física de Materiales 'Nicolás Cabrera', Universidad Autonoma de Madrid (UAM), and This work was financed by the EU (COST Action MOLSPIN (CA15128)) and by the Spanish MINECO through Network NANOMOLNet (MAT2016-61989-REDC), through Grants MAT2013-47869-C4-3-P and FIS2016-74893-P for the UAM group, and through the Unit of Excellence María de Maeztu MDM-2015-0538 and Grant MAT2017-89993, the Polish National Centre through Grant 2011/03/D/ST3/02654 , the European CALIPSO Programme and the Carl Tryggers foundation for Science Research (contracts CTS 14 : 32 and 16 : 32).
Subjects: Solid-state chemistry, Prussian blue, Materials science, Magnetic moment, Magnetism, 02 engineering and technology, General Chemistry, [CHIM.MATE]Chemical Sciences/Material chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, Photochemistry, 01 natural sciences, 0104 chemical sciences, Ion, chemistry.chemical_compound, Photosensitivity, chemistry, Materials Chemistry, 0210 nano-technology, Ternary operation, Isomerization
Abstract: International audience; One of the most attractive characteristics of some Prussian blue derivatives is the sensitivity of their magnetic properties to the irradiation with light. In this work photoinduced effects in the (Fe0.2Cr0.8)1.5[Cr(CN)6]·15H2O PBA have been studied by means of X-ray-based spectroscopies and magnetometry. It is found that the photosensitivity of this compound is mostly centred on the Fe cations: the exposure to green light induces a transfer of electrons from them to the Cr that provokes a reversal of the previously existing linkage isomerization and increases the elastic strain caused by the misfit of the unit cells of the Fe–NC–Cr and Cr–NC–Cr sublattices. The green light also quenches the magnetism of the FeII high-spin (HS) ions present in the sample and reduces the magnetic moments of most of the Cr cations except for CrII HS. Our study highlights the important role played by the mismatch between the unit cells of the coexisting sub-lattices in ternary Prussian blue analogues.
Published: 2019

19. Membrane curvature induces cardiolipin sorting

Author: Feng-Ching Tsai, Francisco Monroy, Samuel Salinas-Almaguer, Francisco J. Cao, Patricia Bassereau, Elena Beltrán-Heredia, Ministerio de Educación, Cultura y Deporte (España), Ministerio de Economía y Competitividad (España), Comunidad de Madrid, Centre National de la Recherche Scientifique (France), European Commission, Universidad Complutense de Madrid = Complutense University of Madrid [Madrid] (UCM), Laboratoire Physico-Chimie Curie [Institut Curie] (PCC), Institut Curie [Paris]-Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Instituto IMDEA Nanociencia [Madrid], Instituto Imdea Nanociencia, Sorbonne Université (SU), University of California [Berkeley], and University of California
Subjects: Cardiolipins, Surface Properties, [PHYS.PHYS.PHYS-BIO-PH]Physics [physics]/Physics [physics]/Biological Physics [physics.bio-ph], media_common.quotation_subject, Lipid Bilayers, Medicine (miscellaneous), Frustration, 02 engineering and technology, Curvature, Article, General Biochemistry, Genetics and Molecular Biology, Quantitative Biology::Cell Behavior, Quantitative Biology::Subcellular Processes, Membrane biophysics, 03 medical and health sciences, chemistry.chemical_compound, symbols.namesake, Cardiolipin, Animals, [SDV.BBM]Life Sciences [q-bio]/Biochemistry, Molecular Biology, lcsh:QH301-705.5, Unilamellar Liposomes, 030304 developmental biology, media_common, Physics::Biological Physics, 0303 health sciences, Nanotubes, Bacteria, Models, Theoretical, 021001 nanoscience & nanotechnology, Elasticity, Research data, Membrane, lcsh:Biology (General), chemistry, Membrane curvature, Mitochondrial Membranes, Phosphatidylcholines, Biophysics, symbols, Mitochondrial cristae, van der Waals force, 0210 nano-technology, General Agricultural and Biological Sciences
Abstract: 7 pags., 3 figs., Cardiolipin is a cone-shaped lipid predominantly localized in curved membrane sites of bacteria and in the mitochondrial cristae. This specific localization has been argued to be geometry-driven, since the CL’s conical shape relaxes curvature frustration. Although previous evidence suggests a coupling between CL concentration and membrane shape in vivo, no precise experimental data are available for curvature-based CL sorting in vitro. Here, we test this hypothesis in experiments that isolate the effects of membrane curvature in lipid-bilayer nanotubes. CL sorting is observed with increasing tube curvature, reaching a maximum at optimal CL concentrations, a fact compatible with self-associative clustering. Observations are compatible with a model of membrane elasticity including van der Waals entropy, from which a negative intrinsic curvature of −1.1 nm is predicted for CL. The results contribute to understanding the physicochemical interplay between membrane curvature and composition, providing key insights into mitochondrial and bacterial membrane organization and dynamics., E.B.-H. acknowledges financial support from Ministerio de Educación, Cultura y Deporte (MECD, Spain) under FPU grant 13/02826. F.M. acknowledges financial support from Ministerio de Economía y Competitividad (MINECO, Spain) and European Regional Development Fund (ERDF) under grant FIS2015-70339-C2-1-R, and from Comunidad de Madrid (CAM, Spain) under grants S2013/MIT-2807, Y2018/BIO-5207 and S2018/NMT-4389. F.J.C. acknowledges financial support from MINECO and from ERDF under grant FIS2015-67745-R (MINECO/ FEDER). P.B.’s group belong to the CNRS consortium CellTiss, to the Labex CelTisPhyBio (ANR-11-LABX0038) and to Paris Sciences et Letters (ANR-10-IDEX-0001-02). F.-C.T. was funded by the EMBO Long-Term fellowship (ALTF 1527-2014) and Marie Curie actions (H2020-MSCA-IF-2014, project membrane ezrin-actin). F.M. is grateful to Fulbright Foundation and MECD to sponsor a sabbatical stay in UC Berkeley as a visiting scholar.
Published: 2019

20. Forest Adaptation to Climate Change along Steep Ecological Gradients: The Case of the Mediterranean-Temperate Transition in South-Western Europe

Author: Laurent Simon, Cleo Bertelsmeier, Miguel A. Zavala, Marta Benito-Garzón, Stephane Dupas, Laetitia M. Navarro, Elena Granda, Iñaki García de Cortazar-Atauri, Marion Sautier, Vânia Proença, Martina Temunović, J. Julio Camarero, Samuel Roturier, Fernando Pulido, Laura Marqués, Philippe Drobinski, Harold Levrel, Paloma Ruiz-Benito, Roxane Sansilvestri, Juan F. Fernández-Manjarrés, Ecologie Systématique et Evolution (ESE), Université Paris-Sud - Paris 11 (UP11)-AgroParisTech-Centre National de la Recherche Scientifique (CNRS), Universidad de Alcalá - University of Alcalá (UAH), Instituto IMDEA Nanociencia [Madrid], Instituto Imdea Nanociencia, University of Extremadura, Universidade de Lisboa (ULISBOA), German Centre for Integrative Biodiversity Research (iDiv), Instituto Pirenaico de Ecologia (IPE), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC), University of Zagreb, Université de Lausanne (UNIL), Laboratoire de Météorologie Dynamique (UMR 8539) (LMD), Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-École des Ponts ParisTech (ENPC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris, École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Biodiversité, Gènes & Communautés (BioGeCo), Institut National de la Recherche Agronomique (INRA)-Université de Bordeaux (UB), Agroclim (AGROCLIM), Institut National de la Recherche Agronomique (INRA), Laboratoire Dynamiques Sociales et Recomposition des Espaces (LADYSS), Université Paris 1 Panthéon-Sorbonne (UP1)-Université Paris 8 Vincennes-Saint-Denis (UP8)-Université Paris Nanterre (UPN)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Évolution, génomes, comportement et écologie (EGCE), Centre National de la Recherche Scientifique (CNRS)-IRD-Université Paris-Sud - Paris 11 (UP11), centre international de recherche sur l'environnement et le développement (CIRED), Centre National de la Recherche Scientifique (CNRS)-École des Ponts ParisTech (ENPC)-École des hautes études en sciences sociales (EHESS)-AgroParisTech-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad), AGroécologie, Innovations, teRritoires (AGIR), Institut National de la Recherche Agronomique (INRA)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées, European Project: 267196,EC:FP7:PEOPLE,FP7-PEOPLE-2010-COFUND,AGREENSKILLS(2012), Instituto Pirenaico de Ecología del CSIC, RICTA, École normale supérieure - Paris (ENS Paris)-École normale supérieure - Paris (ENS Paris), Université de Bordeaux (UB)-Institut National de la Recherche Agronomique (INRA), UE Agroclim (UE AGROCLIM), Université Paris Diderot - Paris 7 (UPD7)-Université Paris Nanterre (UPN)-Université Paris 8 Vincennes-Saint-Denis (UP8)-Université Panthéon-Sorbonne (UP1)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-IRD-Centre National de la Recherche Scientifique (CNRS), Centre International de Recherche sur l'Environnement et le Développement (CIRED), Centre National de la Recherche Scientifique (CNRS)-École des Ponts ParisTech (ENPC)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-École des hautes études en sciences sociales (EHESS)-AgroParisTech, Centre National de la Recherche Scientifique (CNRS)-Université Panthéon-Sorbonne (UP1)-Université Paris 8 Vincennes-Saint-Denis (UP8)-Université Paris Nanterre (UPN)-Université Paris Diderot - Paris 7 (UPD7), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Recherche Agronomique (INRA), Universidad de Extremadura - University of Extremadura (UEX), Universidade de Lisboa = University of Lisbon (ULISBOA), Instituto Pirenaico de Ecologìa = Pyrenean Institute of Ecology [Zaragoza] (IPE - CSIC), Université de Lausanne = University of Lausanne (UNIL), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-École des hautes études en sciences sociales (EHESS)-AgroParisTech-École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS), Université de Toulouse (UT)-Université de Toulouse (UT), Instituto Pirenaico de Ecologia = Pyrenean Institute of Ecology (IPE), Ministerio de Economía y Competitividad (España), Comunidad de Madrid, Fundação para a Ciência e a Tecnologia (Portugal), and Institut National de la Recherche Agronomique (France)
Subjects: 0106 biological sciences, Mediterranean climate, 010504 meteorology & atmospheric sciences, adaptation, social-ecological systems, early warnings, climate change, land abandonment, agroforestry, [SDE.MCG]Environmental Sciences/Global Changes, Geography, Planning and Development, lcsh:TJ807-830, Biodiversity, lcsh:Renewable energy sources, Climate change, Management, Monitoring, Policy and Law, 010603 evolutionary biology, 01 natural sciences, Mediterranean Basin, Temperate climate, lcsh:Environmental sciences, 0105 earth and related environmental sciences, agroforesterie, lcsh:GE1-350, changement climatique, Fire regime, Renewable Energy, Sustainability and the Environment, Ecology, lcsh:Environmental effects of industries and plants, Vegetation, 15. Life on land, Geography, lcsh:TD194-195, 13. Climate action, Ecosystem management
Abstract: Impacts of climate change are likely to be marked in areas with steep climatic transitions. Species turnover, spread of invasive species, altered productivity, and modified processes such as fire regimes can all spread rapidly along ecotones, which challenge the current paradigms of ecosystem management. We conducted a literature review at a continental-wide scale of South-Western European forests, where the drier and warmer conditions of the Mediterranean have been widely used as examples of what is expected in more temperate areas. Results from the literature point to: (a) an expansion of slow-growing evergreen hardwood trees; (b) increased dieback and mortality episodes in forests (both natural and planted) mostly related to competition and droughts, and mainly affecting conifers; and (c) an increase in emergent diseases and pests of keystone-trees used in agroforestry zones. There is no consensus in the literature that fire regimes are directly increasing due to climate change, but available satellite data of fire intensity in the last 17 years has been lower in zones where agroforestry practices are dominant compared to unmanaged forests. In contrast, there is agreement in the literature that the current spread of fire events is probably related to land abandonment patterns. The practice of agroforestry, common in all Mediterranean countries, emerges as a frequent recommendation in the literature to cope with drought, reduce fire risk, and maintain biodiverse landscapes and rural jobs. However, it is unknown the extent to which the open vegetation resulting from agroforestry is of interest to forest managers in temperate areas used to exploiting closed forest vegetation. Hence, many transitional areas surrounding the Mediterranean Basin may be left unmanaged with potentially higher climate-change risks, which require active monitoring in order to understand and help ongoing natural adaptation processes., This research was funded by a small network grant provided by the LabEx-BASC French research consortium granted to J.F.-M., S.D., and H.L. M.A.Z. and P.R.-B. were supported by the grant FUNDIVER (MINECO, CGL2015-69186-C2-2-R). P.R.-B. was funded by the Talent Attraction Grant of the Madrid Community grant number 2016-T2/AMB-1665. V.P. was funded by FCT—The Foundation for Science and Technology grant number SFRH/BPD/80726/2011.
Published: 2018

21. Unraveling dzyaloshinskii-moriya interaction and chiral nature of graphene/cobalt interface

Author: Mariona Cabero, Paolo Perna, Leticia de Melo Costa, Pierluigi Gargiani, Julio Camarero, Pablo Olleros, Alberto Anadón Barcelona, Jan Vogel, Ruben Guerrero, Adrian Gudin, Stefania Pizzini, Rodolfo Miranda, Fernando Ajejas, Maria Varela, Jose Manuel Diez, Manuel Valvidares, Miguel Angel Niño, Universidad Autonoma de Madrid (UAM), Instituto IMDEA Nanociencia [Madrid], Instituto Imdea Nanociencia, Micro et NanoMagnétisme (MNM ), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), ALBA Synchrotron light source [Barcelone], Instituto de Magnetismo Aplicado, and UCM-ADIF-CSIC
Subjects: Materials science, Oxide, FOS: Physical sciences, Bioengineering, 02 engineering and technology, Substrate (electronics), 01 natural sciences, law.invention, chemistry.chemical_compound, law, 0103 physical sciences, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), General Materials Science, Texture (crystalline), 010306 general physics, Spin-½, Condensed Matter - Materials Science, Spintronics, Condensed matter physics, Condensed Matter - Mesoscale and Nanoscale Physics, Graphene, Física de materiales, Mechanical Engineering, Materials Science (cond-mat.mtrl-sci), General Chemistry, Spin–orbit interaction, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Ferromagnetism, chemistry, [PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other], Física del estado sólido, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 0210 nano-technology
Abstract: A major challenge for future spintronics is to develop suitable spin transport channels with long spin lifetime and propagation length. Graphene can meet these requirements, even at room temperature. On the other side, taking advantage of the fast motion of chiral textures, i.e., N\'eel-type domain walls and magnetic skyrmions, can satisfy the demands for high-density data storage, low power consumption and high processing speed. We have engineered epitaxial structures where an epitaxial ferromagnetic Co layer is sandwiched between an epitaxial Pt(111) buffer grown in turn onto MgO(111) substrates and a graphene layer. We provide evidence of a graphene-induced enhancement of the perpendicular magnetic anisotropy up to 4 nm thick Co films, and of the existence of chiral left-handed N\'eel-type domain walls stabilized by the effective Dzyaloshinskii-Moriya interaction (DMI) in the stack. The experiments show evidence of a sizeable DMI at the gr/Co interface, which is described in terms of a conduction electron mediated Rashba-DMI mechanism and points opposite to the Spin Orbit Coupling-induced DMI at the Co/Pt interface. In addition, the presence of graphene results in: i) a surfactant action for the Co growth, producing an intercalated, flat, highly perfect fcc film, pseudomorphic with Pt and ii) an efficient protection from oxidation. The magnetic chiral texture is stable at room temperature and grown on insulating substrate. Our findings open new routes to control chiral spin structures using interfacial engineering in graphene-based systems for future spin-orbitronics devices fully integrated on oxide substrates., Comment: 10 pages, 6 figures
Published: 2018

22. Amperometric Biosensing of miRNA-21 in Serum and Cancer Cells at Nanostructured Platforms Using Anti-DNA–RNA Hybrid Antibodies

Author: José M. Pingarrón, Mohamed Zouari, Susana Campuzano, Noureddine Raouafi, Université de Tunis El Manar (UTM), Institut Pasteur de Tunis, Réseau International des Instituts Pasteur (RIIP), Departamento de Química Orgánica I, Facultad de Química, Universidad Complutense, Universidad Complutense de Madrid = Complutense University of Madrid [Madrid] (UCM), MDEA Nanoscience, Ciudad Universitaria de Cantoblanco, Madrid, 28049, Instituto IMDEA Nanociencia [Madrid], Instituto Imdea Nanociencia, University of Tunis El Manar is acknowledged for the mobility grant (Bourse d’Alternance) awarded to M.Z. The financial support from the Spanish Ministerio de Economía y Competitividad Research Project (CTQ2015-64402-C2-1-R) and the NANOAVANSENS Program from the Comunidad de Madrid (S2013/MT-3029) are gratefully acknowledged., and The authors also thank Drs. J.M. Sánchez-Puelles and E. López-Hernández for kindly providing us the RNAt samples extracted from cell lines and Prof. Besma Loueslati for the blood serum samples. They also acknowledge Dropsens S.L. company for SEM characterization of the working electrodes.
Subjects: General Chemical Engineering, [SDV]Life Sciences [q-bio], 02 engineering and technology, 010402 general chemistry, 01 natural sciences, Horseradish peroxidase, Article, lcsh:Chemistry, chemistry.chemical_compound, Blood serum, Detection limit, Chromatography, biology, RNA, General Chemistry, 021001 nanoscience & nanotechnology, Fragment crystallizable region, Amperometry, 3. Good health, 0104 chemical sciences, chemistry, lcsh:QD1-999, biology.protein, 0210 nano-technology, Biosensor, DNA
Abstract: International audience; This paper describes a disposable amperometric biosensor for simple and sensitive determination of miRNA-21. The bioplatform consists of gold nanoparticles-nanostructured electrode surfaces on which a direct hybridization assay involving the immobilization of a specific thiolated DNA capture probe and recognition of the formed DNA−miRNA-21 heteroduplex by a specific antibody is implemented. The antibody is further recognized through its Fc region by a commercial bacterial protein containing 40 units of horseradish peroxidase (HRP) (ProtA-polyHRP40). The amperometric detection of the hybridization process using the H 2 O 2 /hydroquinone system allows quantification of the target miRNA in the 0.096−25 pM linear range with a detection limit of 29 fM (0.29 amol in 10 μL of sample). The bioplatform offers excellent selectivity against noncomplementary sequences and very acceptable against sequences with an unpaired base (only 30% of the response obtained for the target miRNA). In addition, the bioplatform was shown to be useful for the determination of the endogenous content of the target oncomiR directly in blood serum from breast cancer patients and in breast cancer cells using only 10 ng of total extracted RNA.
Published: 2018

23. Nanoscale engineering of Large AnisotropicMagnetoresistance in La0.67Sr0.33MnO3 Films at RoomTemperature

Author: Perna, Paolo, Ajejas, Fernando, Diez, J, Vicente, Munoz, Guerrero, Ruben, Santamaria, Jacobo, Flament, Stéphane, Méchin, Laurence, Perez, L, Gonzalez, Teresa, Miranda, Rodolfo, Camarero, Julio, IMDEA Nanociencia (IMDEA), Universidad Complutense de Madrid = Complutense University of Madrid [Madrid] (UCM), Equipe Electronique - Laboratoire GREYC - UMR6072, Groupe de Recherche en Informatique, Image et Instrumentation de Caen (GREYC), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU), Instituto IMDEA Nanociencia [Madrid], Instituto Imdea Nanociencia, and Méchin, Laurence
Subjects: [SPI]Engineering Sciences [physics], [SPI] Engineering Sciences [physics], [SPI.TRON] Engineering Sciences [physics]/Electronics, ComputingMilieux_MISCELLANEOUS, [SPI.TRON]Engineering Sciences [physics]/Electronics
Abstract: International audience
Published: 2018

24. Magnetic anisotropy of La0.67Sr0.33MnO3 thin films on LSAT substrates

Author: Chaluvadi, Sandeep-Kumar, Ajejas, Fernando, Orgiani, Pasquale, Rousseau, Olivier, Vinai, Giovanni, Petrov, Alexander Yu, Torelli, Piero, Camarero, Julio, Perna, Paolo, Méchin, Laurence, Equipe Electronique - Laboratoire GREYC - UMR6072, Groupe de Recherche en Informatique, Image et Instrumentation de Caen (GREYC), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU), IMDEA Nanociencia (IMDEA), CNR Istituto Officina dei Materiali (IOM), Consiglio Nazionale delle Ricerche [Roma] (CNR), Laboratorio TASC (IOM CNR), Consiglio Nazionale delle Ricerche (CNR), Instituto IMDEA Nanociencia [Madrid], Instituto Imdea Nanociencia, and Méchin, Laurence
Subjects: [SPI.TRON] Engineering Sciences [physics]/Electronics, ComputingMilieux_MISCELLANEOUS, [SPI.TRON]Engineering Sciences [physics]/Electronics
Abstract: International audience
Published: 2018

25. Dominant switchable magnetoresistance in half-metallic La0.7Sr0.3MnO3 epitaxial films at romm temperature

Author: Ajejas, F, Maccariello, Davide, Diez, J.M., Guerrero, Ruben, Méchin, Laurence, Flament, Stephane, Santamaria, Jacobo, Camarero, Julio, Miranda, Rodolfo, Perna, Paolo, Instituto IMDEA Nanociencia [Madrid], Instituto Imdea Nanociencia, IMDEA Nanociencia (IMDEA), Institute IMDEA Networks [Madrid], Equipe Electronique - Laboratoire GREYC - UMR6072, Groupe de Recherche en Informatique, Image et Instrumentation de Caen (GREYC), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU), Universidad Complutense de Madrid = Complutense University of Madrid [Madrid] (UCM), and Méchin, Laurence
Subjects: [SPI.TRON] Engineering Sciences [physics]/Electronics, ComputingMilieux_MISCELLANEOUS, [SPI.TRON]Engineering Sciences [physics]/Electronics
Abstract: International audience
Published: 2018

26. Time–frequency representation of autoionization dynamics in helium

Author: D. Busto, Álvaro Jiménez-Galán, Cord L. Arnold, Anne Harth, M. Isinger, Fernando Martín, Miguel Miranda, Richard J. Squibb, S. Zhong, David Kroon, S. Plogmaker, M. Turconi, Anne L'Huillier, Pascal Salières, C. Alexandridi, Mathieu Gisselbrecht, L. Barreau, Luca Argenti, Raimund Feifel, Lund University [Lund], Attophysique (ATTO), Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire Interactions, Dynamiques et Lasers (ex SPAM) (LIDyl), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), University of Gothenburg (GU), Max-Born Institute for Nonlinear Optics and Short Pulse Spectroscopy (MBI), Center for Research and Education in Optics and Lasers (CREOL), University of Central Florida [Orlando] (UCF)-School of Optics, Instituto IMDEA Nanociencia [Madrid], Instituto Imdea Nanociencia, ANR-15-CE30-0001,CIMBAAD,Contrôle de l'ionisation moléculaire aux échelles attoseconde et Angström(2015), ANR-11-EQPX-0005,ATTOLAB,Plateforme pour la dynamique attoseconde(2011), ANR-11-IDEX-0003,IPS,Idex Paris-Saclay(2011), European Project: 641789,H2020,H2020-MSCA-ITN-2014,MEDEA(2015), European Project: 654148,H2020,H2020-INFRAIA-2014-2015,LASERLAB-EUROPE(2015), and Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, [PHYS.PHYS]Physics [physics]/Physics [physics], Atomic Physics (physics.atom-ph), Wave packet, FOS: Physical sciences, Fano resonance, Photoionization, Condensed Matter Physics, 01 natural sciences, Atomic and Molecular Physics, and Optics, Physics - Atomic Physics, Computational physics, 010309 optics, Photoexcitation, symbols.namesake, Fourier transform, Time–frequency representation, Autoionization, Ionization, 0103 physical sciences, symbols, Physics::Atomic and Molecular Clusters, Physics::Atomic Physics, 010306 general physics
Abstract: International audience; Autoionization, which results from the interference between direct photoionization and photoexcitation to a discrete state decaying to the continuum by configuration interaction, is a well known example of the important role of electron correlation in light–matter interaction. Information on this process can be obtained by studying the spectral, or equivalently, temporal complex amplitude of the ionized electron wave packet. Using an energy-resolved interferometric technique, we measure the spectral amplitude and phase of autoionized wave packets emitted via the sp2+ and sp3+ resonances in helium. These measurements allow us to reconstruct the corresponding temporal profiles by Fourier transform. In addition, applying various time–frequency representations, we observe the build-up of the wave packets in the continuum, monitor the instantaneous frequencies emitted at any time and disentangle the dynamics of the direct and resonant ionization channels.
Published: 2018

27. AMR sensors made of La0.67Sr0.33MnO3 epitaxial thin films for neuronal activity measurement

Author: Rousseau, Olivier, frantz, francisco, Flament, Stéphane, Guillet, Bruno, Lam Chok Sing, Marc, Chaluvadi, Sandeep-Kumar, perez, lucas, Guerrero, Ruben, Perna, Paolo, Méchin, Laurence, Méchin, Laurence, Equipe Electronique - Laboratoire GREYC - UMR6072, Groupe de Recherche en Informatique, Image et Instrumentation de Caen (GREYC), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU), IMDEA Nanociencia (IMDEA), Instituto IMDEA Nanociencia [Madrid], and Instituto Imdea Nanociencia
Subjects: [SPI.NANO] Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, ComputingMilieux_MISCELLANEOUS, [SPI.TRON] Engineering Sciences [physics]/Electronics, [SPI.TRON]Engineering Sciences [physics]/Electronics
Abstract: International audience
Published: 2018

28. Room temperature biaxial magnetic anisotropy in La0.67Sr0.33MnO3 thin films on SrTiO3 buffered MgO (001) substrates for spintronic applications

Author: Chaluvadi, Sandeep Kumar, Ajejas, Fernando, Orgiani, Pasquale, Rousseau, Olivier, Vinai, Giovanni, Petrov, Aleksandr Yu, Torelli, Piero, Pautrat, Alain, Camarero, Julio, Perna, Paolo, Mechin, Laurence, Equipe Electronique - Laboratoire GREYC - UMR6072, Groupe de Recherche en Informatique, Image et Instrumentation de Caen (GREYC), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU), Universidad Autonoma de Madrid (UAM), Laboratorio TASC (IOM CNR), Consiglio Nazionale delle Ricerche (CNR), Laboratoire de cristallographie et sciences des matériaux (CRISMAT), École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Institut de Chimie du CNRS (INC), Instituto IMDEA Nanociencia [Madrid], Instituto Imdea Nanociencia, 654360 NFFA-Europe, Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS), Universidad Autónoma de Madrid (UAM), CNR Istituto Officina dei Materiali (IOM), National Research Council of Italy | Consiglio Nazionale delle Ricerche (CNR), SuPerconducting and other INnovative materials and devices institute (SPIN), Normandie Université (NU)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), and UAM. Departamento de Física de la Materia Condensada
Subjects: Superconductivity, Materials science, Magnetic ordering, Magnetics materials, Physics and Astronomy (miscellaneous), Magnetoresistance, Magnetometer, Thin films, FOS: Physical sciences, Transition metal oxides, 02 engineering and technology, Substrate (electronics), 01 natural sciences, law.invention, Condensed Matter::Materials Science, [SPI]Engineering Sciences [physics], Spintronic devices, law, 0103 physical sciences, Thin film, 010306 general physics, Anisotropy, Magnetic materials, Magnetic anisotropy, ComputingMilieux_MISCELLANEOUS, Condensed Matter - Materials Science, Spintronics, Condensed matter physics, Física, Materials Science (cond-mat.mtrl-sci), Coercivity, 021001 nanoscience & nanotechnology, [SPI.TRON]Engineering Sciences [physics]/Electronics, Phase transitions, Ferromagnetism, Kerr effects, 0210 nano-technology
Abstract: © 2018 Author(s). This article is distributed under a Creative Commons Attribution (CC BY) License, Spintronics exploits the magnetoresistance effects to store or sense the magnetic information. Since the magnetoresistance strictly depends on the magnetic anisotropy of a system, it is fundamental to set a defined anisotropy to the system. Here, we investigate half-metallic La0.67Sr0.33MnO3 thin films by means of vectorial Magneto-Optical Kerr Magnetometry and found that they exhibit pure biaxial magnetic anisotropy at room temperature if grown onto a MgO (001) substrate with a thin SrTiO3 buffer. In this way, we can avoid unwanted uniaxial magnetic anisotropy contributions that may be detrimental for specific applications. The detailed study of the angular evolution of the magnetization reversal pathways and critical fields (coercivity and switching) discloses the origin of the magnetic anisotropy, which is magnetocrystalline in nature and shows fourfold symmetry at any temperature, S.K.C. acknowledges Programme International de Coopération Scientifique (PICS) du CNRS under Grant No. 6161 and SIMEM Doctoral School at Universite de Caen Normandie for financial support. IMDEA-Nanociencia acknowledges support from the “Severo Ochoa” Program for Centres of Excellence in R&D (MINECO, Grant No. SEV-2016-0686). F.A., J.C., and P.P. acknowledge the support of Spanish MINECO Project Nos. FIS2015-67287-P and FIS2016-78591-C3-1-R and the Comunidad de Madrid through Project NANOFRONTMAG CM. This project has received funding from the European Union’s Horizon 2020 research and innovation programme under Grant Agreement Nos. 737116 (byAxon) and 654360 NFFA-Europe
Published: 2018

29. A novel route to control magnetic anisotropy in La0.67Sr0.33MnO3 thin films

Author: Chaluvadi, Sandeep-Kumar, Ajejas, Fernando, Orgiani, Pasquale, Rousseau, Olivier, Vinai, Giovanni, Petrov, Alexander Yu, Torelli, Piero, Camarero, Julio, Perna, Paolo, Méchin, Laurence, Méchin, Laurence, Equipe Electronique - Laboratoire GREYC - UMR6072, Groupe de Recherche en Informatique, Image et Instrumentation de Caen (GREYC), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU), Universidad Autonoma de Madrid (UAM), CNR Istituto Officina dei Materiali (IOM), Consiglio Nazionale delle Ricerche [Roma] (CNR), Laboratorio TASC (IOM CNR), Consiglio Nazionale delle Ricerche (CNR), Instituto IMDEA Nanociencia [Madrid], and Instituto Imdea Nanociencia
Subjects: ComputingMilieux_MISCELLANEOUS, [SPI.TRON] Engineering Sciences [physics]/Electronics, [SPI.TRON]Engineering Sciences [physics]/Electronics
Abstract: International audience
Published: 2018

30. Tuning domain wall velocity with Dzyaloshinskii-Moriya interaction

Author: Stefania Pizzini, Julio Camarero, Jan Vogel, Paolo Perna, Dayane de Souza Chaves, Fernando Ajejas, Viola Křižáková, Ruben Guerrero, Adrian Gudin, Universidad Autonoma de Madrid (UAM), Instituto IMDEA Nanociencia [Madrid], Instituto Imdea Nanociencia, Micro et NanoMagnétisme (MNM ), Institut Néel (NEEL), and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])
Subjects: Work (thermodynamics), Condensed Matter - Materials Science, Materials science, Physics and Astronomy (miscellaneous), Condensed matter physics, Spintronics, Materials Science (cond-mat.mtrl-sci), FOS: Physical sciences, 02 engineering and technology, 021001 nanoscience & nanotechnology, Epitaxy, 01 natural sciences, Metal, Domain wall (magnetism), visual_art, [PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other], 0103 physical sciences, visual_art.visual_art_medium, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Polar, 010306 general physics, 0210 nano-technology, Layer (electronics), Néel temperature, ComputingMilieux_MISCELLANEOUS
Abstract: We have studied a series of Pt/Co/M epitaxial trilayers, in which Co is sandwiched between Pt and a non magnetic layer M (Pt, Ir, Cu, Al). Using polar magneto-optical Kerr microscopy, we show that the field- induced domain wall speeds are strongly dependent on the nature of the top layer, they increase going from M=Pt to lighter top metallic overlayers, and can reach several 100 m/s for Pt/Co/Al. The DW dynamics is consistent with the presence of chiral N\'eel walls stabilized by interfacial Dzyaloshinskii-Moriya interaction (DMI) whose strength increases going from Pt to Al top layers. This is explained by the presence of DMI with opposite sign at the Pt/Co and Co/M interfaces, the latter increasing in strength going towards heavier atoms, possibly due to the increasing spin-orbit interaction. This work shows that in non-centrosymmetric trilayers the domain wall dynamics can be finely tuned by engineering the DMI strength, in view of efficient devices for logic and spitronics applications., Comment: 5 pages, 4 Figures
Published: 2017

31. Thickness and angular dependent magnetic anisotropy studies of bi-axially strained La0.7Sr0.3MnO3 thin films on LSAT (001) by Magneto-Optical Kerr Magnetometry

Author: Chaluvadi, Sandeep-Kumar, Perna, Paolo, Ajejas, Fernando, Vinai, Giovanni, Petrov, Alexander Yu, Cano, Daniel, Camarero, Julio, Torelli, Piero, Méchin, Laurence, Equipe Electronique - Laboratoire GREYC - UMR6072, Groupe de Recherche en Informatique, Image et Instrumentation de Caen (GREYC), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU), Instituto IMDEA Nanociencia [Madrid], Instituto Imdea Nanociencia, Universidad Autonoma de Madrid (UAM), Laboratorio TASC (IOM CNR), Consiglio Nazionale delle Ricerche (CNR), Departamento de Fisica de la Materia Condensada [Madrid] (FMC), Facultad de Ciencas [Madrid], Universidad Autonoma de Madrid (UAM)-Universidad Autonoma de Madrid (UAM), and Méchin, Laurence
Subjects: [SPI.NANO] Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, ComputingMilieux_MISCELLANEOUS
Abstract: International audience
Published: 2017

32. Engineering Large Anisotropic Magnetoresistance in La0.7Sr0.3MnO3Films at Room Temperature

Author: Ajejas, Fernando, Maccariello, Davide, Gudin, Adrian, Guerrero, Ruben, Méchin, Laurence, Flament, Stéphane, Santamaria, Jacobo, Camarero, Julio, Miranda, Rodolfo, Perna, Paolo, Universidad Autonoma de Madrid (UAM), IMDEA Nanociencia (IMDEA), Instituto IMDEA Nanociencia [Madrid], Instituto Imdea Nanociencia, Equipe Electronique - Laboratoire GREYC - UMR6072, Groupe de Recherche en Informatique, Image et Instrumentation de Caen (GREYC), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU), Universidad Complutense de Madrid = Complutense University of Madrid [Madrid] (UCM), Departamento de Fisica de la Materia Condensada [Madrid] (FMC), Facultad de Ciencas [Madrid], Universidad Autonoma de Madrid (UAM)-Universidad Autonoma de Madrid (UAM), and Méchin, Laurence
Subjects: [SPI.NANO] Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, ComputingMilieux_MISCELLANEOUS
Abstract: International audience
Published: 2017

33. Disentangling low field Anisotropic Magnetoresistance in La0.7Sr0.3MnO3 Films

Author: Ajejas, Fernando, Maccariello, Davide, Guerrero, Ruben, Méchin, Laurence, Flament, Stéphane, Santamaria, Jacobo, Camarero, Julio, Miranda, Rodolfo, Perna, Paolo, Universidad Autonoma de Madrid (UAM), IMDEA Nanociencia (IMDEA), Instituto IMDEA Nanociencia [Madrid], Instituto Imdea Nanociencia, Equipe Electronique - Laboratoire GREYC - UMR6072, Groupe de Recherche en Informatique, Image et Instrumentation de Caen (GREYC), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU), Universidad Complutense de Madrid = Complutense University of Madrid [Madrid] (UCM), Departamento de Fisica de la Materia Condensada [Madrid] (FMC), Facultad de Ciencas [Madrid], Universidad Autonoma de Madrid (UAM)-Universidad Autonoma de Madrid (UAM), and Méchin, Laurence
Subjects: [SPI.NANO] Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, ComputingMilieux_MISCELLANEOUS
Abstract: International audience
Published: 2017

34. In-plane magnetic anisotropy studies of bi-axially strained La0.7Sr0.3MnO3 thin films by Magneto-Optical Kerr Magnetometry

Author: Chaluvadi, Sandeep-Kumar, Perna, Paolo, Ajejas, Fernando, Camarero, Julio, Flament, Stéphane, Méchin, Laurence, Méchin, Laurence, Equipe Electronique - Laboratoire GREYC - UMR6072, Groupe de Recherche en Informatique, Image et Instrumentation de Caen (GREYC), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU), Instituto IMDEA Nanociencia [Madrid], Instituto Imdea Nanociencia, Universidad Autonoma de Madrid (UAM), Departamento de Fisica de la Materia Condensada [Madrid] (FMC), Facultad de Ciencas [Madrid], and Universidad Autonoma de Madrid (UAM)-Universidad Autonoma de Madrid (UAM)
Subjects: [SPI.NANO] Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, ComputingMilieux_MISCELLANEOUS
Abstract: International audience
Published: 2017

35. Hexakis [60]Fullerene Adduct-Mediated Covalent Assembly of Ruthenium Nanoparticles and Their Catalytic Properties

Author: M. Rosa Axet, Antonio Muñoz, Hervé Martinez, Georgian Melinte, Iann C. Gerber, Ahmed Bentaleb, Pierre Lecante, Beatriz M. Illescas, Ovidiu Ersen, Nazario Martín, Philippe Serp, Faqiang Leng, Laboratoire de chimie de coordination (LCC), Institut de Chimie de Toulouse (ICT-FR 2599), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS), Laboratoire de physique et chimie des nano-objets (LPCNO), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées (INSA)-Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie de Toulouse (ICT-FR 2599), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Institut de Recherche sur les Systèmes Atomiques et Moléculaires Complexes (IRSAMC), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Surfaces, Interfaces et Nano-Objets (CEMES-SINanO), Centre d'élaboration de matériaux et d'études structurales (CEMES), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Centre de Recherche Paul Pascal (CRPP), Université de Bordeaux (UB)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Departamento de Química Orgánica I, Facultad de Química, Universidad Complutense, Universidad Complutense de Madrid = Complutense University of Madrid [Madrid] (UCM), Instituto IMDEA Nanociencia [Madrid], Instituto Imdea Nanociencia, Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et Nanosciences Grand-Est (MNGE), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Institut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux (IPREM), Université de Pau et des Pays de l'Adour (UPPA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Blanc, Sylvie, Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie de Toulouse (ICT-FR 2599), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche sur les Systèmes Atomiques et Moléculaires Complexes (IRSAMC), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie de Toulouse (ICT-FR 2599), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie de Toulouse (ICT-FR 2599), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA), Université de Strasbourg (UNISTRA)-Matériaux et nanosciences d'Alsace (FMNGE), Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut de Chimie de Toulouse (ICT-FR 2599), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Institut de Recherche sur les Systèmes Atomiques et Moléculaires Complexes (IRSAMC), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et nanosciences d'Alsace (FMNGE), Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UPS), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UPS), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Université Fédérale Toulouse Midi-Pyrénées-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UPS), Centre National de la Recherche Scientifique (CNRS)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UPS), Université de Bordeaux (UB)-Centre National de la Recherche Scientifique (CNRS), Computer Science Department of University of Malaga, Universidad de Málaga [Málaga], Complutense University of Madrid (UCM), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et nanosciences d'Alsace, Centre National de la Recherche Scientifique (CNRS)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Université de Strasbourg (UNISTRA)-Réseau nanophotonique et optique, Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA), Université de Pau et des Pays de l'Adour (UPPA)-Centre National de la Recherche Scientifique (CNRS), departament de quimica fisica i quimica inorganica i quimica analitica i quimica organica, Universitat Rovira i Virgili, Institut de Chimie de Toulouse (ICT), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut de Chimie de Toulouse (ICT), Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche sur les Systèmes Atomiques et Moléculaires Complexes (IRSAMC), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), and Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse)
Subjects: Fullerene, chemistry.chemical_element, Nanoparticle, 02 engineering and technology, 010402 general chemistry, Photochemistry, 01 natural sciences, Catalysis, Ruthenium, Adduct, Nitrobenzene, chemistry.chemical_compound, c60, Polymer chemistry, [CHIM] Chemical Sciences, [CHIM]Chemical Sciences, [CHIM.COOR]Chemical Sciences/Coordination chemistry, Carboxylate, ComputingMilieux_MISCELLANEOUS, nanomaterials, Organic Chemistry, Química orgánica, [CHIM.CATA] Chemical Sciences/Catalysis, [CHIM.MATE]Chemical Sciences/Material chemistry, General Chemistry, [CHIM.CATA]Chemical Sciences/Catalysis, 021001 nanoscience & nanotechnology, 0104 chemical sciences, chemistry, Covalent bond, Fullerenes, Hydrogenation, 0210 nano-technology
Abstract: International audience; The C66(COOH)12 hexa-adduct has been successfully used as a building block to construct carboxylate bridged 3D networks with very homogeneous sub-1.8 nm ruthenium nanoparticles. The obtained nanostructures are active in nitrobenzene selective hydrogenation.
Published: 2017

36. Thickness and angular dependent magnetic anisotropy of La 0.67 Sr 0.33 MnO 3 thin films by Vectorial Magneto Optical Kerr Magnetometry

Author: Laurence Méchin, Sandeep-Kumar Chaluvadi, Fernando Ajejas, Paolo Perna, Stéphane Flament, Alain Pautrat, Julio Camarero, Equipe Electronique - Laboratoire GREYC - UMR6072, Groupe de Recherche en Informatique, Image et Instrumentation de Caen (GREYC), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU), Instituto IMDEA Nanociencia [Madrid], Instituto Imdea Nanociencia, Institute IMDEA Materials [Madrid], Institute IMDEA Materials, Laboratoire de cristallographie et sciences des matériaux (CRISMAT), École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Institut de Chimie du CNRS (INC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS), Universidad Autónoma de Madrid (UAM), Normandie Université (NU)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), and Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)
Subjects: 010302 applied physics, History, Materials science, Condensed matter physics, Magnetometer, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, Computer Science Applications, Education, Magneto optical, law.invention, Magnetic anisotropy, law, 0103 physical sciences, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Thin film, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, 0210 nano-technology
Abstract: International audience; We investigate the in-plane magnetic anisotropy in La 0.67 Sr 0.33 MnO 3 thin films grown on SrTiO 3 (001) substrate using angular dependent room temperature Vectorial Magneto-Optical Kerr Magnetometry. The experimental data reveals that the magnetic anisotropy symmetry landscape significantly changes depending upon the strain and thickness. At low film thickness (12 and 25 nm) the dominant uniaxial anisotropy is due to interface effects, step edges due to mis-cut angle of SrTiO 3 substrate. At intermediate thickness, the magnetic anisotropy presents a competition between magnetocrystalline (biaxial) and substrate step induced (uniaxial) anisotropy. Depending upon their relative strengths, a profound biaxial or uniaxial or mixed anisotropy is favoured. Above the critical thickness, magnetocrystalline anisotropy dominates all other effects and shows a biaxial anisotropy.
Published: 2016

37. Effects of inter- and intra-aggregate magnetic dipolar interactions on the magnetic heating efficiency of iron oxide nanoparticles

Author: Francisco J. Teran, Gorka Salas, T. Valdivielso, David Cabrera, Jesus G. Ovejero, Julian Carrey, European Commission, Ministerio de Economía y Competitividad (España), Comunidad de Madrid, European Cooperation in Science and Technology, Instituts Thématiques Multi-organismes (France), Instituto de Ciencia de Materiales de Madrid (ICMM), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC), Instituto IMDEA Nanociencia [Madrid], Instituto Imdea Nanociencia, Laboratoire de physique et chimie des nano-objets (LPCNO), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut de Chimie de Toulouse (ICT), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche sur les Systèmes Atomiques et Moléculaires Complexes (IRSAMC), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche sur les Systèmes Atomiques et Moléculaires Complexes (IRSAMC), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie de Toulouse (ICT-FR 2599), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Institut National Polytechnique (Toulouse) (Toulouse INP), and Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)
Subjects: Work (thermodynamics), Materials science, Metal Nanoparticles, General Physics and Astronomy, Nanoparticle, Nanotechnology, 02 engineering and technology, Calorimetry, 010402 general chemistry, Ferric Compounds, 01 natural sciences, Magnetics, chemistry.chemical_compound, Microscopy, Electron, Transmission, Colloids, Physical and Theoretical Chemistry, Temperature, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Magnetic field, Dipole, Hysteresis, Magnetic hyperthermia, chemistry, Chemical physics, [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph], 0210 nano-technology, Iron oxide nanoparticles
Abstract: Iron oxide nanoparticles have found an increasing number of biomedical applications as sensing or trapping platforms and therapeutic and/or diagnostic agents. Most of these applications are based on their magnetic properties, which may vary depending on the nanoparticle aggregation state and/or concentration. In this work, we assess the effect of the inter- and intra-aggregate magnetic dipolar interactions on the heat dissipation power and AC hysteresis loops upon increasing the nanoparticle concentration and the hydrodynamic aggregate size. We observe different effects produced by inter- (long distance) and intra-aggregate (short distance) interactions, resulting in magnetizing and demagnetizing effects, respectively. Consequently, the heat dissipation power under alternating magnetic fields strongly reflects such different interacting phenomena. The intra-aggregate interaction results were successfully modeled by numerical simulations. A better understanding of magnetic dipolar interactions is mandatory for achieving a reliable magnetic hyperthermia response when nanoparticles are located into biological matrices., This work has been partially supported by the European Commission (MULTIFUN, no. 262943), Spanish Ministry of Economy and Competitiveness (MAT2013-47395-C4-3-R), and Madrid Regional Government (NANOFRONTMAG, S2013/MIT-2850). F. J. T acknowledges financial support from the Ramón y Cajal subprogram (RYC-2011-09617). J. C. and F. J. T. thank the European Cost Action TD1402 (RADIOMAG). J. C. thanks support by the ITMO Cancer during the “Plan cancer 2009–2013”.
Published: 2016

38. Anisotropic magnetoresistance in vicinal La0.7Sr0.3MnO3 thin films

Author: Méchin, Laurence, Flament, Stéphane, Perna, Paolo, Equipe Electronique - Laboratoire GREYC - UMR6072, Groupe de Recherche en Informatique, Image et Instrumentation de Caen (GREYC), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU), Instituto IMDEA Nanociencia [Madrid], Instituto Imdea Nanociencia, and Méchin, Laurence
Subjects: [SPI.NANO] Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, ComputingMilieux_MISCELLANEOUS
Abstract: International audience
Published: 2016

39. Fundamentals and advances in magnetic hyperthermia

Author: Gauvin Hemery, Francisco J. Teran, Daniel Ortega, Elio Alberto Perigo, Olivier Sandre, Eneko Garaio, Fernando Plazaola, Physics and Materials Science Research Unit, University of Luxembourg, University of Luxembourg [Luxembourg], Laboratoire de Chimie des Polymères Organiques (LCPO), Centre National de la Recherche Scientifique (CNRS)-Institut Polytechnique de Bordeaux-Ecole Nationale Supérieure de Chimie, de Biologie et de Physique (ENSCBP)-Université de Bordeaux (UB)-Institut de Chimie du CNRS (INC), Team 3 LCPO : Polymer Self-Assembly & Life Sciences, Centre National de la Recherche Scientifique (CNRS)-Institut Polytechnique de Bordeaux-Ecole Nationale Supérieure de Chimie, de Biologie et de Physique (ENSCBP)-Université de Bordeaux (UB)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Polytechnique de Bordeaux-Ecole Nationale Supérieure de Chimie, de Biologie et de Physique (ENSCBP)-Université de Bordeaux (UB)-Institut de Chimie du CNRS (INC), Instituto IMDEA Nanociencia [Madrid], Instituto Imdea Nanociencia, Ctr Nacl Biotecnol CSIC, Nanobiotecnol IMDEA Nanociencia, Unidad Asociada, Consejo Superior de Investigaciones Científicas [Madrid] (CSIC), UCL, Inst Biomed Engn, University College of London [London] (UCL), Univ Basque Country, Elekt & Elekt Saila, Bilbao, European Project: COST Action TD1402,RADIOMAG, Université de Bordeaux (UB)-Ecole Nationale Supérieure de Chimie, de Biologie et de Physique (ENSCBP)-Institut Polytechnique de Bordeaux-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and Université de Bordeaux (UB)-Ecole Nationale Supérieure de Chimie, de Biologie et de Physique (ENSCBP)-Institut Polytechnique de Bordeaux-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Bordeaux (UB)-Ecole Nationale Supérieure de Chimie, de Biologie et de Physique (ENSCBP)-Institut Polytechnique de Bordeaux-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)
Subjects: General Physics and Astronomy, FOS: Physical sciences, MAGNETIC FLUID HYPERTHERMIA, Nanotechnology, COBALT FERRITE NANOPARTICLES, Condensed Matter - Soft Condensed Matter, chemistry.chemical_compound, SPECIFIC ABSORPTION RATE, SUPERPARAMAGNETIC NANOPARTICLES, HEAT-TRANSFER, BIOMEDICAL APPLICATIONS, Physics - Biological Physics, Heating efficiency, IRON-OXIDE NANOPARTICLES, LATTICE BOLTZMANN METHOD, equipment and supplies, 3. Good health, Cancer treatment, Magnetic hyperthermia, [CHIM.POLY]Chemical Sciences/Polymers, chemistry, Biological Physics (physics.bio-ph), Nanomedicine, Magnetic nanoparticles, Soft Condensed Matter (cond-mat.soft), CORE-SHELL NANOPARTICLES, Magnetic heating, human activities, Iron oxide nanoparticles, PROTEIN CORONA, Superparamagnetism
Abstract: Nowadays, magnetic hyperthermia constitutes a complementary approach to cancer treatment. The use of magnetic particles as heating mediators, proposed in the 1950s, provides a novel strategy for improving tumor treatment and, consequently, patient quality of life. This review reports a broad overview about several aspects of magnetic hyperthermia addressing new perspectives and the progress on relevant features such as the ad hoc preparation of magnetic nanoparticles, physical modeling of magnetic heating, methods to determine the heat dissipation power of magnetic colloids including the development of experimental apparatus and the influence of biological matrices on the heating efficiency., Comment: 104 pages, 28 figures. Manuscript accepted for publication in Applied Physics Reviews
Published: 2015

40. Substrate induced strain effects in La0.7Sr0.3MnO3 thin films

Author: Chaluvadi, Sandeep-Kumar, Perna, P., Ajejas, F., Camarero, J., Méchin, Laurence, Equipe Electronique - Laboratoire GREYC - UMR6072, Groupe de Recherche en Informatique, Image et Instrumentation de Caen (GREYC), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU), Departamento de Fisica de la Materia Condensada [Madrid] (FMC), Facultad de Ciencas [Madrid], Universidad Autonoma de Madrid (UAM)-Universidad Autonoma de Madrid (UAM), Instituto IMDEA Nanociencia [Madrid], Instituto Imdea Nanociencia, and Référent, Greyc
Subjects: ComputingMethodologies_GENERAL, [SPI.TRON] Engineering Sciences [physics]/Electronics, ComputingMilieux_MISCELLANEOUS, [SPI.TRON]Engineering Sciences [physics]/Electronics
Abstract: Poster; International audience
Published: 2015

41. Vibrationally resolved B 1s photoionization cross section of BF 3

Author: Ayuso D1, Kimura M2, Kooser K3, Patanen M4, Plésiat E1, Argenti L1, Mondal S2, Travnikova O4, Sakai K2, Palacios A1, Kukk E3, Decleva P5, Ueda K2, Martín F1, 6, 7, Miron C4, Universidad Autonoma de Madrid (UAM), Institute of Multidisciplinary Research for Advanced Materials, Tohoku University [Sendai], Department of Physics and Astronomy [Turku], University of Turku, Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Humboldt-Universität zu Berlin, Laboratoire de Chimie Physique - Matière et Rayonnement (LCPMR), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université Pierre et Marie Curie - Paris 6 (UPMC), Dipartimento di Scienze Chimiche, Università degli studi di Trieste, Instituto IMDEA Nanociencia [Madrid], Instituto Imdea Nanociencia, UAM. Departamento de Química, Universidad Autónoma de Madrid (UAM), Humboldt University Of Berlin, Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Università degli studi di Trieste = University of Trieste, Ayuso, D, Kimura, M., Kooser, K., Patanen, M., Plésiat, E., Argenti, L., Mondal, S., Travnikova, O., Sakai, K., Palacios, A., Kukk, E., Decleva, Pietro, Ueda, K., Martín, F., Miron, C., Institut fur Physik [Berlin], Diaz, C, Rabadan, I, Garcia, G, Mendez, L, Martin, F, Ayuso, D., and Plesiat, E.
Subjects: Diffraction, History, Ionization, Materials science, High resolution photoelectron spectroscopy, Photoionization, Photon energy, Neutral molecules, 01 natural sciences, 7. Clean energy, Molecular physics, Electron spectroscopy, Photoionization cross section, Negative ions, Education, Physics and Astronomy (all), Cross section (physics), X-ray photoelectron spectroscopy, 0103 physical sciences, Physics::Atomic and Molecular Clusters, Intramolecular scattering, ddc:530, Physics::Atomic Physics, Physical and Theoretical Chemistry, 010306 general physics, Spectroscopy, Vibrationally resolved B 1s photoionization cross section of BF3, [PHYS]Physics [physics], ta114, 010304 chemical physics, Chemistry, Scattering, Química, Molecules, 530 Physik, Computer Science Applications, Photoelectron spectroscopy, Electron diffraction, Orders of magnitude (time), Intramolecular force, Atomic physics
Abstract: Photoelectron diffraction is a well-established technique for structural characterization of solids, based on the interference of the native photoelectron wave with those scattered from the neighboring atoms. For isolated systems in the gas phase similar studies suffer from orders of magnitude lower signals due to the very small sample density. Here we present a detailed study of the vibrationally resolved B 1s photoionization cross section of BF3 molecule. A combination of high-resolution photoelectron spectroscopy measurements and of state-of-the-art static-exchange and time-dependent DFT calculations shows the evolution of the photon energy dependence of the cross section from a complete trapping of the photoelectron wave (low energies) to oscillations due to photoelectron diffraction phenomena. The diffraction pattern allows one to access structural information both for the ground neutral state of the molecule and for the core-ionized cation. Due to a significant change in geometry between the ground and the B 1s(-1) core-ionized state in the BF3 molecule, several vibrational final states of the cation are populated, allowing investigation of eight different relative vibrationally resolved photoionization cross sections. Effects due to recoil induced by the photoelectron emission are also discussed.
Published: 2015

42. The Brain’s Response to Reward Anticipation and Depression in Adolescence: Dimensionality, Specificity, and Longitudinal Predictions in a Community-Based Sample

Author: Stringaris, Argyris, Vidal-Ribas Belil, Pablo, Artiges , Eric, Lemaitre, Hervé, Gollier-Briant, Fanny, Wolke, Selina, Vulser, Hélène, Miranda, Ruben, Penttilä, Jani, Struve, Maren, Fadai, Tahmine, Kappel, Viola, Grimmer, Yvonne, Goodman, Robert, Poustka, Luise, Conrod, Patricia, Poline, Jean-Baptiste, Cattrell, Anna, Banaschewski, Tobias, Bokde, Arun L.W., Bromberg, Uli, Büchel, Christian, Flor, Herta, Frouin, Vincent, Gallinat, Juergen, Garavan, Hugh, Gowland, Penny, Heinz, Andreas, Ittermann, Bernd, Nees, Frauke, Papadopoulos, Dimitri, Paus, Tomas, Smolka, Michael N., Walter, Henrik, Whelan, Rob, Martinot, Jean-Luc, Schumann, Gunter, Paillère-Martinot, Marie-Laure, Consortium, The IMAGEN, Williams, Steven, Loth, Eva, Adolescent psychopathology and Medicine, Hôpital Cochin [AP-HP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP), Neuroimagerie en psychiatrie (U1000), Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Paris Descartes - Paris 5 (UPD5)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Sud - Paris 11 (UP11), Instituto IMDEA Nanociencia [Madrid], Instituto Imdea Nanociencia, Imagerie Cerebrale en Psychiatrie, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de la Santé et de la Recherche Médicale (INSERM), Department of Child and Adolescent Psychiatry, King's College London Institute of Psychiatry, Institute of Psychiatry, Psychology & Neuroscience, King's College London, King‘s College London, Department of Child and Adolescent Psychiatry and Psychotherapy [Mannheim], Universität Heidelberg [Heidelberg], Discipline of Psychiatry [Dublin], School of Medicine [Dublin], Trinity College Dublin-Trinity College Dublin, Universitaetsklinikum Hamburg-Eppendorf = University Medical Center Hamburg-Eppendorf [Hamburg] (UKE), Service NEUROSPIN (NEUROSPIN), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, University of Vermont [Burlington], Sir Peter Mansfield Magnetic Resonance Centre [Nottingham], University of Nottingham, UK (UON), McConnell Brain Imaging Centre (MNI), Montreal Neurological Institute and Hospital, McGill University = Université McGill [Montréal, Canada]-McGill University = Université McGill [Montréal, Canada], Technische Universität Dresden = Dresden University of Technology (TU Dresden), IMAGEN Consortium, CHU Cochin [AP-HP], Neuroimagerie en psychiatrie ( U1000 ), Université Paris-Sud - Paris 11 ( UP11 ) -Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Institut National de la Santé et de la Recherche Médicale ( INSERM ) -Université Paris Descartes - Paris 5 ( UPD5 ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Institut National de la Santé et de la Recherche Médicale ( INSERM ), King's College, Universitaetsklinikum Hamburg-Eppendorf = University Medical Center Hamburg-Eppendorf [Hamburg] ( UKE ), Service NEUROSPIN ( NEUROSPIN ), Direction de Recherche Fondamentale (CEA) ( DRF (CEA) ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay, University of Nottingham, UK ( UON ), McConnell Brain Imaging Centre ( MNI ), Montreal Neurological Institute [Montréal], McGill University-McGill University, Technische Universität Dresden ( TUD ), Université Paris-Sud - Paris 11 (UP11)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Descartes - Paris 5 (UPD5)-Institut National de la Santé et de la Recherche Médicale (INSERM), Universität Heidelberg [Heidelberg] = Heidelberg University, Université Paris-Saclay-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Université Paris-Sud - Paris 11 (UP11)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Paris Descartes - Paris 5 (UPD5), and Technische Universität Dresden (TUD)
Subjects: Male, medicine.medical_specialty, Adolescent, Anhedonia, behavioral disciplines and activities, Brain mapping, Article, 03 medical and health sciences, 0302 clinical medicine, Reward, Functional neuroimaging, medicine, [INFO.INFO-IM]Computer Science [cs]/Medical Imaging, Humans, Psychiatry, Depression (differential diagnoses), Brain Mapping, [ INFO.INFO-IM ] Computer Science [cs]/Medical Imaging, Depression, Subthreshold conduction, Functional Neuroimaging, Ventral striatum, Magnetic Resonance Imaging, Anticipation, 030227 psychiatry, Affect, Psychiatry and Mental health, medicine.anatomical_structure, Mood, nervous system, Ventral Striatum, Female, medicine.symptom, Psychology, 030217 neurology & neurosurgery, psychological phenomena and processes, Clinical psychology
Abstract: International audience; OBJECTIVE: The authors examined whether alterations in the brain's reward network operate as a mechanism across the spectrum of risk for depression. They then tested whether these alterations are specific to anhedonia as compared with low mood and whether they are predictive of depressive outcomes.METHOD: Functional MRI was used to collect blood-oxygen-level-dependent (BOLD) responses to anticipation of reward in the monetary incentive task in 1,576 adolescents in a community-based sample. Adolescents with current subthreshold depression and clinical depression were compared with matched healthy subjects. In addition, BOLD responses were compared across adolescents with anhedonia, low mood, or both symptoms, cross-sectionally and longitudinally.RESULTS: Activity in the ventral striatum was reduced in participants with subthreshold and clinical depression relative to healthy comparison subjects. Low ventral striatum activation predicted transition to subthreshold or clinical depression in previously healthy adolescents at 2-year follow-up. Brain responses during reward anticipation decreased in a graded manner between healthy adolescents, adolescents with current or future subthreshold depression, and adolescents with current or future clinical depression. Low ventral striatum activity was associated with anhedonia but not low mood; however, the combined presence of both symptoms showed the strongest reductions in the ventral striatum in all analyses.CONCLUSIONS: The findings suggest that reduced striatal activation operates as a mechanism across the risk spectrum for depression. It is associated with anhedonia in healthy adolescents and is a behavioral indicator of positive valence systems, consistent with predictions based on the Research Domain Criteria.
Published: 2015

43. Phase Measurement of a Fano Resonance Using Tunable Attosecond Pulses

Author: David Kroon, Jan Marcus Dahlström, Fernando Martín, Esben Witting Larsen, Mathieu Gisselbrecht, Sophie E. Canton, Luca Argenti, Miguel Miranda, Eva Lindroth, Thomas Carette, Cord L. Arnold, Johan Mauritsson, Alfred Maquet, A Jiménez-Galánz, Diego Guenot, Marija Kotur, Maite Louisy, Samuel Bengtsson, Anne L'Huillier, UAM. Departamento de Química, Universidad Autonoma de Madrid (UAM), Department of Physics, Lund University, Lund, Sweden, Department of Synchrotron Radiation Research, University of Lund-Czech Academy of Sciences [Prague] (CAS), Stockholm University, Atomic Physics (APSU), Laboratoire de Chimie Physique - Matière et Rayonnement (LCPMR), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Condensed Matter Physics Center (IFIMAC), Instituto IMDEA Nanociencia [Madrid], Instituto Imdea Nanociencia, Universidad Autónoma de Madrid (UAM), Lund University [Lund], and Lund University [Lund]-Czech Academy of Sciences [Prague] (CAS)
Subjects: History, Ionization, Attosecond, chemistry.chemical_element, Physics::Optics, Photoionization, Fano plane, Photon energy, 01 natural sciences, 010305 fluids & plasmas, Education, 0103 physical sciences, Physics::Atomic and Molecular Clusters, Physics::Atomic Physics, 010306 general physics, Physics, [PHYS]Physics [physics], Argon, Attosecond pulse, Fano resonance, Química, Computer Science Applications, Interferometry, Amplitude, chemistry, Atomic physics
Abstract: International audience; We study photoionization of argon atoms close to the 3s23p6 → 3s13p64p Fano resonance using an attosecond pulse train and a weak infrared probe field. An interferometric technique combined with tunable attosecond pulses allows us to determine the phase of the photoionization amplitude as a function of photon energy. We interpret the experimental results using an analytical two-photon model based on the Fano formalism and obtain quantitative agreement.
Published: 2015

44. Efficient treatment of breast cancer xenografts with multifunctionalized iron oxide nanoparticles combining magnetic hyperthermia and anti-cancer drug delivery

Author: Julia Grandke, Antonio Aires, Angeles Villanueva, Aitziber L. Cortajarena, Heidi Dähring, Volker Ettelt, Susanne Kossatz, Adriele Prina-Mello, Maha Sader, Robert Ludwig, Alfonso Latorre, Ana Lazaro-Carrillo, José Courty, Rodolfo Miranda, Yuri Volkov, Álvaro Somoza, Pierre Couleaud, Kieran Crosbie-Staunton, Macarena Calero, Ingrid Hilger, Institutfür DiagnostischeundInterventionelle RadiologieI, Friedrich-Schiller-Universität = Friedrich Schiller University Jena [Jena, Germany], Croissance cellulaire, réparation et régénération tissulaires (CRRET), Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), Laboratoire CRRET, EAC/CNRS-7149, Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12), Centre for Research on Adaptive Nanostructures and Nanodevices, Trinity College Dublin, Instituto IMDEA Nanociencia [Madrid], and Instituto Imdea Nanociencia
Subjects: Hyperthermia, Pathology, medicine.medical_specialty, medicine.medical_treatment, Metal Nanoparticles, Mice, Nude, Antineoplastic Agents, Apoptosis, Breast Neoplasms, [SDV.CAN]Life Sciences [q-bio]/Cancer, Ferric Compounds, Mice, chemistry.chemical_compound, Drug Delivery Systems, Breast cancer, In vivo, Cell Line, Tumor, medicine, Animals, Humans, Cytotoxic T cell, Doxorubicin, ComputingMilieux_MISCELLANEOUS, Medicine(all), Chemotherapy, Chemistry, Hyperthermia, Induced, X-Ray Microtomography, medicine.disease, Xenograft Model Antitumor Assays, 3. Good health, Disease Models, Animal, Drug Liberation, Magnetic hyperthermia, Cancer research, Female, Iron oxide nanoparticles, Research Article, medicine.drug
Abstract: Introduction Tumor cells can effectively be killed by heat, e.g. by using magnetic hyperthermia. The main challenge in the field, however, is the generation of therapeutic temperatures selectively in the whole tumor region. We aimed to improve magnetic hyperthermia of breast cancer by using innovative nanoparticles which display a high heating potential and are functionalized with a cell internalization and a chemotherapeutic agent to increase cell death. Methods The superparamagnetic iron oxide nanoparticles (MF66) were electrostatically functionalized with either Nucant multivalent pseudopeptide (N6L; MF66-N6L), doxorubicin (DOX; MF66-DOX) or both (MF66-N6LDOX). Their cytotoxic potential was assessed in a breast adenocarcinoma cell line MDA-MB-231. Therapeutic efficacy was analyzed on subcutaneous MDA-MB-231 tumor bearing female athymic nude mice. Results All nanoparticle variants showed an excellent heating potential around 500 W/g Fe in the alternating magnetic field (AMF, conditions: H = 15.4 kA/m, f = 435 kHz). We could show a gradual inter- and intracellular release of the ligands, and nanoparticle uptake in cells was increased by the N6L functionalization. MF66-DOX and MF66-N6LDOX in combination with hyperthermia were more cytotoxic to breast cancer cells than the respective free ligands. We observed a substantial tumor growth inhibition (to 40% of the initial tumor volume, complete tumor regression in many cases) after intratumoral injection of the nanoparticles in vivo. The proliferative activity of the remaining tumor tissue was distinctly reduced. Conclusion The therapeutic effects of breast cancer magnetic hyperthermia could be strongly enhanced by the combination of MF66 functionalized with N6L and DOX and magnetic hyperthermia. Our approach combines two ways of tumor cell killing (magnetic hyperthermia and chemotherapy) and represents a straightforward strategy for translation into the clinical practice when injecting nanoparticles intratumorally. Electronic supplementary material The online version of this article (doi:10.1186/s13058-015-0576-1) contains supplementary material, which is available to authorized users.
Published: 2015

45. Tuning positive and negative low-field anisotropic magnetoresistance in half-metallic epitaxial La0.7Sr0.3MnO3 thin films

Author: Perna, P., Ajejas, F., Maccariello, D., Guerrero, R., Méchin, Laurence, Flament, Stéphane, Camarero, J., Miranda, R., Référent, Greyc, Departamento de Fisica de la Materia Condensada [Madrid] (FMC), Facultad de Ciencas [Madrid], Universidad Autonoma de Madrid (UAM)-Universidad Autonoma de Madrid (UAM), Departamento de Física de Materiales [Madrid], Universidad Autonoma de Madrid (UAM), Equipe Electronique - Laboratoire GREYC - UMR6072, Groupe de Recherche en Informatique, Image et Instrumentation de Caen (GREYC), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU), Instituto IMDEA Nanociencia [Madrid], and Instituto Imdea Nanociencia
Subjects: ComputingMethodologies_GENERAL, ComputingMilieux_MISCELLANEOUS, [SPI.TRON] Engineering Sciences [physics]/Electronics, [SPI.TRON]Engineering Sciences [physics]/Electronics
Abstract: Poster; International audience
Published: 2015

46. Low field magnetoresistance at room temperature in La0.7Sr0.3MnO3 thin films

Author: Méchin, Laurence, Flament, Stéphane, Perna, Paolo, Equipe Electronique - Laboratoire GREYC - UMR6072, Groupe de Recherche en Informatique, Image et Instrumentation de Caen (GREYC), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU), Instituto IMDEA Nanociencia [Madrid], Instituto Imdea Nanociencia, and Référent, Greyc
Subjects: [SPI.TRON] Engineering Sciences [physics]/Electronics, ComputingMilieux_MISCELLANEOUS, [SPI.TRON]Engineering Sciences [physics]/Electronics
Abstract: International audience
Published: 2014

47. Tailoring magnetic anisotropy in half-metallic epitaxial La0.7Sr0.3MnO3 thin films

Author: Perna, Paolo, Maccariello, D., Méchin, Laurence, Camarero, J., Pereda-Miranda, R., Instituto IMDEA Nanociencia [Madrid], Instituto Imdea Nanociencia, Equipe Electronique - Laboratoire GREYC - UMR6072, Groupe de Recherche en Informatique, Image et Instrumentation de Caen (GREYC), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU), and Référent, Greyc
Subjects: [SPI.TRON] Engineering Sciences [physics]/Electronics, ComputingMilieux_MISCELLANEOUS, [SPI.TRON]Engineering Sciences [physics]/Electronics
Abstract: International audience
Published: 2014

48. Three Peaks of 2011 Draconid Activity Including that Connected with Pre-1900 Material

Author: Solano, E., Rodrigo, C., Pulido, R., Carry, B., Koten, Pavel, Vaubaillon, Jeremie, Tóth, Juraj, Margonis, Anastasios, Ďuriš, František, Departamento de Astrofisica [Madrid], Centro de Astrobiologia [Madrid] (CAB), Instituto Nacional de Técnica Aeroespacial (INTA)-Consejo Superior de Investigaciones Científicas [Madrid] (CSIC)-Instituto Nacional de Técnica Aeroespacial (INTA)-Consejo Superior de Investigaciones Científicas [Madrid] (CSIC), Instituto IMDEA Nanociencia [Madrid], Instituto Imdea Nanociencia, Universidad Politécnica de Madrid (UPM), Joseph Louis LAGRANGE (LAGRANGE), Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), Institut de Mécanique Céleste et de Calcul des Ephémérides (IMCCE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université de Lille-Observatoire de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)
Subjects: Meteor (satellite), Physics, Orbital elements, [PHYS]Physics [physics], Mass distribution, Meteoroid, Comet, Astronomy, Astronomy and Astrophysics, Outgassing, Planetary science, Space and Planetary Science, Earth and Planetary Sciences (miscellaneous), Meteor shower, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], ComputingMilieux_MISCELLANEOUS
Abstract: A Draconid meteor shower outburst was observed from on board two scientific aircraft deployed above Northern Europe on 8th October 2011. The activity profile was measured using a set of photographic and video cameras. The main peak of the activity occurred around 20:15 ± 0:0.5 UT which is consistent with the model prediction as well as with the IMO network visual observations. The corrected hourly rates reached a value of almost 350. The brighter meteors peaked about 15–20 min earlier than the dimmer ones. This difference can be explained by different directions of the ejection of the meteoroids from the parent comet. One of the instruments was even able to detect meteors connected with the material ejected from the parent comet before 1900 and thus confirmed the prediction of the model, although it was based on uncertain pre-1900 cometary data. Another small peak of the activity, which was caused by material ejected during the 1926 perihelion passage of the parent comet, was detected around 21:10 UT. The mass distribution index determined using the narrow field-of-view video camera was 2.0 ± 0.1. This work shows that the observation of meteor outbursts can constrain the orbital elements, outgassing activity and existence of jets at the surface of a comet.
Published: 2014

49. MOKE Microscopy and low field domain magneteroresistance ofpatterned La0.7Sr0.3MnO3 thin films

Author: Flament, Stéphane, Fadil, Dalal, Perna, Paolo, Routoure, Jean-Marc, Guillet, Bruno, Wu, Sheng, Lebargy, Sylvain, Gasnier, Julien, Macariello, Davide, Camarero, Julio, Méchin, Laurence, Equipe Electronique - Laboratoire GREYC - UMR6072, Groupe de Recherche en Informatique, Image et Instrumentation de Caen (GREYC), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU), Instituto IMDEA Nanociencia [Madrid], Instituto Imdea Nanociencia, and Méchin, Laurence
Subjects: [SPI.TRON] Engineering Sciences [physics]/Electronics, [SPI.TRON]Engineering Sciences [physics]/Electronics
Abstract: International audience; The magnetization reversal in 16 nm and 70 nm thick La0.7Sr0.3MnO3 (LSMO) patterned films deposited on 10° vicinal SrTiO3 substrates were studied by longitudinal magneto-optical Kerr (MOKE) microscopy. MOKE microscopy showed that the vicinal substrate induces uniaxial anisotropy and that both domain arrangement and magnetization reversal process depend on this substrate induced anisotropy as well as on the shape induced anisotropy. This is consistent with recently published papers [1, 2].Based both on local magnetization loops and on the observed magnetic microstructure, we showed that the low field magnetoresistance originates from anisotropic magnetoresistance within domain walls during magnetization reversal that proceeds by nucleation and propagation when H was applied parallel to the step edge direction and from bulk anisotropic magnetoresistance during magnetization reversal that proceeds by coherent rotation of the magnetization when H was applied perpendicular to the step edge direction. It is proposed that magnetization reversal as sharp as possible occurring by nucleation/propagation of vortex type domain walls is favourable in order to induce high low field sensitivity.The resulting equivalent magnetic noise spectral density level was finally found minimum, about 1 - 2 nT·Hz-1/2 at 1 Hz and 0.3 - 0.4 nT·Hz-1/2 in the white noise frequency range, in the 100 μm wide strip patterned in the 16 nm thick LSMO film with H parallel to the step edge direction, whatever the orientation of H with I. These measured bn values of the order of few nT·Hz-1/2 at room temperature are very promising for future room temperature low field magnetic sensors based on LSMO thin films. Comparable to usual AMR sensors, the low frequency excess noise occurs at a much mower frequency which is also to be pointed out [3].[1] J. Heidler et al J. Appl. Phys. 112, 103921 (2012)[2] P. Wohlhüter et al J. Phys.: Condens. Matter. 25 176004 (2013)[3] Stutzke et al, Journal of Applied Physics 97, 10Q107 (2005)
Published: 2014

50. Low field magnetoresistance and magnetization reversal in vicinal La0.7Sr0.3MnO3 thin films at room temperature

Author: Méchin, Laurence, Flament, Stéphane, Perna, Paolo, Maccariello, D., Camarero, Julio, Miranda, Rodolfo, Référent, Greyc, Equipe Electronique - Laboratoire GREYC - UMR6072, Groupe de Recherche en Informatique, Image et Instrumentation de Caen (GREYC), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU), Instituto IMDEA Nanociencia [Madrid], and Instituto Imdea Nanociencia
Subjects: ComputingMilieux_MISCELLANEOUS, [SPI.TRON] Engineering Sciences [physics]/Electronics, [SPI.TRON]Engineering Sciences [physics]/Electronics
Abstract: International audience
Published: 2014

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