Author: "Stéphan Rouzière" - Searchworks@Jio Institute Digital Library Search Results

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73 results on '"Stéphan Rouzière"'

1. Structural resolution of inorganic nanotubes with complex stoichiometry

Author: Geoffrey Monet, Mohamed S. Amara, Stéphan Rouzière, Erwan Paineau, Ziwei Chai, Joshua D. Elliott, Emiliano Poli, Li-Min Liu, Gilberto Teobaldi, and Pascale Launois
Subjects: Science
Abstract: Structural determination of inorganic nanotubes has lagged far behind that of their carbon-based counterparts. Here, the authors present a transferable methodology, combining wide angle X-ray scattering and computation, to quantitatively resolve the atomic structure of inorganic nanotubes with complex stoichiometry.
Published: 2018
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2. A liquid-crystalline hexagonal columnar phase in highly-dilute suspensions of imogolite nanotubes

Author: Erwan Paineau, Marie-Eve M. Krapf, Mohamed-Salah Amara, Natalia V. Matskova, Ivan Dozov, Stéphan Rouzière, Antoine Thill, Pascale Launois, and Patrick Davidson
Subjects: Science
Abstract: Liquid crystals are grouped into four main classes—nematic, lamellar, cubic and columnar—depending on their symmetries. Here, the authors show for the first time that a columnar phase can form in suspensions of imogolite nanotubes at very low concentrations.
Published: 2016
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3. Ti-modified imogolite nanotubes: highly photoactive nanoreactors for H2 production

Author: Pablo Jimenéz-Calvo, Anna Sobolewska, Mark Isaacs, Yu Zhang, Amélie Leforestier, Jéril Degrouard, Stéphan Rouzière, Claire Goldmann, Delphine Vantelon, Pascale Launois, Mohamed Nawfal Ghazzal, and Erwan Paineau
Abstract: Imogolite nanotubes present a unique spatial separation of conduction and valence bands but the large bandgap inhibits potential application as a photocatalyst. The first step toward using these well-defined nanotubes in photocatalysis and exploiting their natural polarization-promoting charge separation across the nanotubes wall, is to tune their bandgap energy. Here, titanium modified double walled aluminogermanate imogolite nanotubes are prepared to overcome this limitation. Structural and optical properties are determined at different scales and the photocatalytic performance is evaluated for H2 production under UV-visible light irradiation. Although the incorporation of Ti atoms into the structure remains limited, the resulting nanotubes reveal a remarkable hydrogen evolution rate of ~1500 µmol g-1 h-1, corresponding to a 65-fold increase relative to a reference TiO2P25 photocatalyst. These results confirm the theoretical predictions regarding the untapped potential of modified imogolite nanotubes as promising 1D photoactive polarized nanoreactors.
Published: 2023
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4. Crystalline structures of l-cysteine and l-cystine

Author: Yangyang Su, Etienne P. Hessou, Estefania Colombo, Gustavo Belletti, Ali Moussadik, Ivan T. Lucas, Vincent Frochot, Michel Daudon, Stéphan Rouzière, Dominique Bazin, Kezhi Li, Paola Quaino, Frederik Tielens, Chemistry, Faculty of Sciences and Bioengineering Sciences, General Chemistry, General Chemistry [Brussel] (ALGC), Vrije Universiteit Brussel [Bruxelles] (VUB), State Key Laboratory of Solidification Processing, Northwestern Polytechnical University [Xi'an] (NPU), Instituto de Matemática Aplicada del Litoral (IMAL-CONICET-UNL). Santa Fe, Laboratoire Interfaces et Systèmes Electrochimiques (LISE), Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Maladies rénales fréquentes et rares : des mécanismes moléculaires à la médecine personnalisée (CoRaKID), Institut National de la Santé et de la Recherche Médicale (INSERM)-Sorbonne Université (SU), Laboratoire de Physique des Solides (LPS), Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie Physique (ICP), Institut de Chimie du CNRS (INC)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), and Martin, Véronique
Subjects: Cystinuria, [SDV]Life Sciences [q-bio], Cystinosis, Organic Chemistry, Clinical Biochemistry, L-cystine, l-cysteine, l-cystine, [SDV.SP]Life Sciences [q-bio]/Pharmaceutical sciences, Biochemistry, [PHYS.PHYS.PHYS-CHEM-PH] Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph], [SDV.SP] Life Sciences [q-bio]/Pharmaceutical sciences, [SDV] Life Sciences [q-bio], Biominerals, Cystine, Humans, characterization, [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph], Cysteine, Disulfides, Crystalline structure, Computer simulations
Abstract: International audience; It is assumed that genetic diseases affecting the metabolism of cysteine and the kidney function lead to two different kinds of pathologies, namely cystinuria and cystinosis whereby generate L-cystine crystals. Recently, the presence of L-cysteine crystal has been underlined in the case of cystinosis. Interestingly, it can be strikingly seen that cystine ([-S-CH2-CH-(NH2)-COOH]2) consists of two cysteine (C3H7NO2S) molecules connected by a disulfide (S-S) bond. Therefore, the study of cystine and cysteine is important for providing a better understanding of cystinuria and cystinosis. In this paper, we elucidate the discrepancy between L-cystine and L-cysteine by investigating the theoretical and experimental infrared spectra (IR), X-ray diffraction (XRD) as well as Raman spectra aiming to obtain a better characterization of abnormal deposits related to these two genetic pathologies.
Published: 2022
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5. Molecular-Scale Understanding of the Embrittlement in Polyethylene Ocean Debris

Author: Olivier Boyron, Laura Rowenczyk, Christopher J. Garvey, Gwénaël Gouadec, Alexandra Ter Halle, Stéphan Rouzière, Marianne Impéror-Clerc, Anne Françoise Mingotaud, Laboratoire de Physique des Solides (LPS), Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), De la Molécule aux Nanos-objets : Réactivité, Interactions et Spectroscopies (MONARIS), Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Chimie, Catalyse, Polymères et Procédés, R 5265 (C2P2), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-École supérieure de Chimie Physique Electronique de Lyon (CPE)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Interactions moléculaires et réactivité chimique et photochimique (IMRCP), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-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), Université de Lyon-Université de Lyon-École Supérieure de Chimie Physique Électronique de Lyon (CPE)-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)-Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Fédération de Recherche Fluides, Energie, Réacteurs, Matériaux et Transferts (FERMAT), 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)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), IDeAS - Interfaces Dynamiques et Assemblages Stimulables (IDeAS), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie de Toulouse (ICT), SMODD - Systèmes Moléculaires Organisés et Développement Durable (SMODD), Australian Nuclear Science and Technology Organisation [Australie] (ANSTO), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Lund Institute for Advances Neutron and X-ray Scattering, Biofilm — Research Center for Biointerfaces and Biomedical Science Department, Malmø University, Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Université de Lyon-Université de Lyon-École supérieure de Chimie Physique Electronique de Lyon (CPE)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie de Toulouse (ICT-FR 2599), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut de Recherche pour le Développement (IRD)-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 National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, Centre National de la Recherche Scientifique (CNRS)-École supérieure de Chimie Physique Electronique de Lyon (CPE)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon
Subjects: polyethylene, Materials science, polymer, 010501 environmental sciences, 01 natural sciences, Crystallinity, chemistry.chemical_compound, Differential scanning calorimetry, [CHIM.ANAL]Chemical Sciences/Analytical chemistry, Environmental Chemistry, Lamellar structure, 14. Life underwater, Composite material, Atlantic Ocean, Embrittlement, ComputingMilieux_MISCELLANEOUS, 0105 earth and related environmental sciences, chemistry.chemical_classification, size exclusion chromatography, General Chemistry, Environmental exposure, Polymer, X-ray scattering, Polyethylene, [CHIM.POLY]Chemical Sciences/Polymers, chemistry, Raman spectroscopy, weathering, Molar mass distribution, plastics, differential scanning calorimetry, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, Water Pollutants, Chemical, Environmental Monitoring
Abstract: International audience; The fate of plastic waste is a pressing issue since it forms a visible and long-lived reminder of the environmental impact of consumer habits. In this study, we examine the structural changes in the lamellar arrangements of semicrystalline poly-ethylene (PE) packaging waste with the aim of understanding the physical mechanisms of embrittlement in PE exposed to the marine environment. PE microplastics and macroplastics from identifiable PE packaging were collected in the Atlantic Ocean and compared to new PE boxes. Several experimental techniques interrogate the effects of environmental exposure on their bulk and surface properties. Size exclusion chromatography determines the molecular weight distribution of the PE polymer chains and differential scanning calorimetry gives the crystallinity. Small-and wide-angle X-ray scattering examines the packing of PE chains into semicrystalline lamellae. Longitudinal acoustic mode Raman spectroscopy provides a complementary measurement of the length of PE polymer chains extending through the crystalline lamellar domains. While there is a high degree of uncertainty in the time scale for the changes, the overall picture at the molecular scale is that although PE becomes more crystalline with environmental exposure, the lamellar order present in new packing boxes is disrupted by the weathering process. This process has important implications for embrittlement and subsequent degradation.
Published: 2020
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6. Solid wetting-layers in inorganic nano-reactors: The water in imogolite nanotube case

Author: Lucas Fine, Ziwei Chai, M. Amara, Andrea Orecchini, Erwan Paineau, Gilberto Teobaldi, Li-Min Liu, Alicia Ruiz-Caridad, Geoffrey Monet, Stéphan Rouzière, Stéphane Rols, Pascale Launois, Mónica Jiménez-Ruiz, Laboratoire de Physique des Solides (LPS), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), Beijing Computational Science Research Center [Beijing] (CSRC), Dipartimento di Fisica e Geologia [Perugia], Università degli Studi di Perugia (UNIPG), Institut Laue-Langevin (ILL), ILL, School of Physics, Beihang University, and Scientific Computing Department, STFC
Subjects: Nanotube, Materials science, Scattering, General Engineering, Bioengineering, Imogolite, 02 engineering and technology, General Chemistry, [CHIM.MATE]Chemical Sciences/Material chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, Electrostatics, 01 natural sciences, Atomic and Molecular Physics, and Optics, 0104 chemical sciences, [PHYS.PHYS.PHYS-COMP-PH]Physics [physics]/Physics [physics]/Computational Physics [physics.comp-ph], Molecular dynamics, Chemical physics, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Molecule, General Materials Science, Density functional theory, Wetting, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], 0210 nano-technology
Abstract: International audience; Solid wetting-layers in inorganic nano-reactors: the water in imogolite nanotube case In 2016, 'isolated' water molecules trapped inside beryl nanochannels provided the fi rst fi rm experimental evidence of the dipole ordering of water molecules and a new 'quantum tunneling' state was evidenced. We have discovered a new phase of 'isolated' water molecules at the inner surface of inorganic nanotubes and we have investigated their associated dynamical properties. Our fi ndings are signifi cant to the emerging fi eld of 'isolated' nanoconfi ned water and to the areas of water science, nanoreactors and nanofl uidics. Inelastic neutron scattering and DFT-MD techniques are used in association with new methods of analysis which may be of interest to other fi elds of physics and nanosciences. By combined use of wide-angle X-ray scattering, thermo-gravimetric analysis, inelastic neutron scattering, density functional theory and density functional theory molecular dynamics simulations, we investigate the structure, dynamics and stability of the water wetting-layer in single-walled aluminogermanate imogolite nanotubes (SW Ge-INTs): an archetypal system for synthetically controllable and monodisperse nano-reactors. We demonstrate that the water wetting-layer is strongly bound and solid-like up to 300 K under atmospheric pressure, with dynamics markedly different from that of bulk water. Atomic-scale characterisation of the wetting-layer reveals organisation of the H 2 O molecules in a curved triangular sublattice stabilised by the formation of three H-bonds to the nanotube's inner surface, with covalent interactions sufficiently strong to promote energetically favourable decoupling of the H 2 O molecules in the adlayer. The evidenced changes in the local composition, structure, electrostatics and dynamics of the Ge-INT's inner surface upon the formation of the solid wetting-layer demonstrate solvent-mediated functionalisation of the nanotube's cavity at room temperature and pressure, suggesting new strategies for the design of nano-rectors towards potential control of chemical reactivity in nano-confined volumes.
Published: 2020
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7. Pathologies related to abnormal deposits in dermatology : a physico-chemical approach

Author: Hester Colboc, Philippe Moguelet, Emmanuel Letavernier, Vincent Frochot, Jean-François Bernaudin, Raphaël Weil, Stéphan Rouzière, Patricia Senet, Claude Bachmeyer, Naomi Laporte, Ivan Lucas, Vincent Descamps, Reyhan Amode, Florence Brunet-Possenti, Nicolas Kluger, Lydia Deschamps, Arnaud Dubois, Solenn Reguer, Andrea Somogyi, Kadda Medjoubi, Matthieu Refregiers, Michel Daudon, Dominique Bazin, Clinicum, Department of Dermatology, Allergology and Venereology, Helsinki University Hospital Area, HUS Inflammation Center, Refregiers, Matthieu, Hôpital Rothschild [AP-HP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP), Sorbonne Université (SU), Service d'Anatomie et cytologie pathologiques [CHU Tenon], CHU Tenon [AP-HP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU), Service d'Explorations fonctionnelles multidisciplinaires [CHU Tenon], Maladies rénales fréquentes et rares : des mécanismes moléculaires à la médecine personnalisée (CoRaKID), Institut National de la Santé et de la Recherche Médicale (INSERM)-Sorbonne Université (SU), Sorbonne Université - Faculté de Médecine (SU FM), Laboratoire de Physique des Solides (LPS), Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Service de dermatologie et allergologie [CHU Tenon], Service de Médecine Interne = Hôpital de jour de médecine [CHU Tenon], Laboratoire Interfaces et Systèmes Electrochimiques (LISE), Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Service de Dermatologie [Hôpital Bichat – Claude-Bernard - APHP], AP-HP - Hôpital Bichat - Claude Bernard [Paris], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP), Helsinki University Central Hospital, University of Helsinki, Hôpital Xavier Bichat, Service d'anatomie et cytologie pathologiques, Assistance Publique - Hôpitaux de Paris, Laboratoire Charles Fabry / Biophotonique, Laboratoire Charles Fabry (LCF), Institut d'Optique Graduate School (IOGS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Centre de biophysique moléculaire (CBM), Université d'Orléans (UO)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie Physique (ICP), and Institut de Chimie du CNRS (INC)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)
Subjects: OPTICAL COHERENCE TOMOGRAPHY, TITANIUM-DIOXIDE NANOPARTICLES, X-RAY-FLUORESCENCE, [SDV.BBM.BP] Life Sciences [q-bio]/Biochemistry, Molecular Biology/Biophysics, Building and Construction, Dermatology, [SDV.MHEP.DERM] Life Sciences [q-bio]/Human health and pathology/Dermatology, Syn-chrotron radiation, TRANSFORM-INFRARED-SPECTROSCOPY, SCANNING-ELECTRON-MICROSCOPY, Calcification, COMBINING MU-XRF, [SDV.BBM.BP]Life Sciences [q-bio]/Biochemistry, Molecular Biology/Biophysics, DENSITY-FUNCTIONAL THEORY, SYNCHROTRON-RADIATION TECHNIQUES, Vibrational spectroscopies, Electronic microscopy, 3121 General medicine, internal medicine and other clinical medicine, Electrical and Electronic Engineering, ComputingMilieux_MISCELLANEOUS, [SDV.MHEP.DERM]Life Sciences [q-bio]/Human health and pathology/Dermatology, FRONTAL FIBROSING ALOPECIA, IN-VIVO
Abstract: Although numerous pathologies are associated with abnormal skin deposits, these remain poorly described, as accurate characterization continues to present a challenge for dermatologists. Their submicrometer size as well as their diverse chemistry require various characterization tools. We aim to exemplify characterization of endogenous and exogenous skin deposits in some selected skin diseases using different physico-chemical techniques. We begin with a presentation of selected dis-eases associated with skin deposits. We then present those of our results which show their variety of structure, location and chemical composition, obtained with various tools: Field Emission Scanning Electron Microscopy coupled with Energy Dispersive X-ray Spectroscopy, X-ray fluorescence, vibra-tional spectroscopies, as well as techniques specific to synchrotron radiation. Our results constitute a real opportunity to improve diagnosis, and to understand the pathogenesis of many skin diseases, and opportunities for therapeutic intervention.
Published: 2022
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8. Acetic Acid-Modulated Room Temperature Synthesis of MIL-100 (Fe) Nanoparticles for Drug Delivery Applications

Author: Mengli Ding, Jingwen Qiu, Stéphan Rouzière, Christophe Rihouey, Luc Picton, and Ruxandra Gref
Subjects: Inorganic Chemistry, room temperature synthesis, metal organic frameworks (MOFs) nanoparticles, acetic acid modulator, cyclodextrin polymers, drug delivery system, Organic Chemistry, General Medicine, Physical and Theoretical Chemistry, Molecular Biology, Spectroscopy, Catalysis, Computer Science Applications
Abstract: Due to their flexible composition, large surface areas, versatile surface properties, and degradability, nanoscale metal organic frameworks (nano MOFs) are drawing significant attention in nanomedicine. In particular, iron trimesate MIL-100 (Fe) is studied extensively in the drug delivery field. Nanosized MIL-100 (Fe) are obtained mostly by microwave-assisted synthesis. Simpler, room-temperature (RT) synthesis methods attract growing interest and have scale-up potential. However, the preparation of RT MIL100 is still very challenging because of the high tendency of the nanoparticles to aggregate during their synthesis, purification and storage. To address this issue, we prepared RT MIL100 using acetic acid as a modulator and used non-toxic cyclodextrin-based coatings to ensure stability upon storage. Hydrodynamic diameters less than 100 nm were obtained after RT synthesis, however, ultrasonication was needed to disaggregate the nanoparticles after their purification by centrifugation. The model drug adenosine monophosphate (AMP) was successfully encapsulated in RT MIL100 obtained using acetic acid as a modulator. The coated RT MIL100 has CD-exhibited degradability, good colloidal stability, low cytotoxicity, as well as high drug payload efficiency. Further studies will focus on applications in the field of cancer therapy.
Published: 2023
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9. Calcified leg Ulcers in older patients: clinical description, morphology and chemical characterization

Author: Michel Daudon, Dominique Bazin, Michael Reby, Naomi Laporte, Stéphan Rouzière, Juliette Fontaine, Hester Colboc, Agnès Galezowski, Christine Forasassi, Emmanuel Letavernier, Sylvie Meaume, Vincent Frochot, Laboratoire de Chimie-Physique (LCP), and Université de Cocody
Subjects: Aging, medicine.medical_specialty, [SDV]Life Sciences [q-bio], 030232 urology & nephrology, Gastroenterology, Palpation, Varicose Ulcer, 030207 dermatology & venereal diseases, 03 medical and health sciences, 0302 clinical medicine, Dystrophic calcification, Bacterial colonization, Older patients, Internal medicine, medicine, Humans, Rothschild, Prospective Studies, Aged, medicine.diagnostic_test, business.industry, Field emission scanning electron microscopy, Leg Ulcer, medicine.disease, 3. Good health, Leg ulcer, Venous Insufficiency, Calcium, Geriatrics and Gerontology, business
Abstract: Chronic wounds, including leg ulcers, constitute an important medical problem among older patients. Dystrophic calcifications (DC) are associated with a variety of disorders, including leg ulcers. The aim of this study was to report the clinical and biological characteristics of older patients with DC in leg ulcers and to determine the morphology and chemical composition of these calcifications. We conducted a prospective monocentric study in our Geriatric-Wound and Healing ward, Rothschild Hospital, Paris, from January 2018 to December 2019. Patients with leg ulcers were screened for DC by palpation. Patients’ clinical, biological, and radiological findings were collected. DC morphology was analyzed using field-emission scanning electron microscopy and chemical composition was analyzed using µFourier transform infra-red spectroscopy and X-ray Fluorescence. Ten (7%) of the 143 patients hospitalized for leg ulcers presented DC. Older patients with DC were more likely to have leg ulcers with venous insufficiency (p = .015), colonized by Pseudomonas aeruginosa (p = .026), with a longer healing evolution (p = .0072) and hypercalcemia (p = .041). Five DC were extracted from ulcers: 2 presented 500 nm lacunar spheres and intermingled fibrils of about 10 nm in diameter, consistent with bacterial and biofilm imprints. DC were always composed of calcium–phosphate apatite and associated to the presence of zinc. Our analyses were consistent with the involvement of microorganisms and inflammatory process in DC formation. Early management of venous insufficiency, treatment of chronic bacterial colonization and use of calcium-solubilizing drugs seem to be rational strategies for calcified leg ulcer management in older patients.
Published: 2021
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10. Non‐spherical pearl layers in the Polynesian ‘black‐lipped’ Pinctada margaritifera : The non‐nacreous deposits compared to microstructure of the shell growing edge

Author: Marine Cotte, Cédrik Lo, Yannicke Dauphin, Denis Saulnier, Oulfa Belhadj, Stéphan Rouzière, Kadda Medjoubi, Murielle Salomé, Jean-Pierre Cuif, Andreas Somogyi, Gilles Luquet, Centre de Recherche en Paléontologie - Paris (CR2P), Muséum national d'Histoire naturelle (MNHN)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Institut de Systématique, Evolution, Biodiversité (ISYEB ), Muséum national d'Histoire naturelle (MNHN)-École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA), Department of Biomaterials [Potsdam], Max Planck Institute of Colloids and Interfaces, Max-Planck-Gesellschaft-Max-Planck-Gesellschaft, Biologie des Organismes et Ecosystèmes Aquatiques (BOREA), Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Sorbonne Université (SU)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU), Centre de Recherche sur la Conservation (CRC ), Muséum national d'Histoire naturelle (MNHN)-Ministère de la Culture et de la Communication (MCC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des Solides (LPS), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), European Synchrotron Radiation Facility (ESRF), Laboratoire d'Archéologie Moléculaire et Structurale (LAMS), Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Direction des Ressources Marines (DRM), Ministère de l'économie et des finances, Ecosystèmes Insulaires Océaniens (UMR 241) (EIO), Université de la Polynésie Française (UPF)-Institut Louis Malardé [Papeete] (ILM), and Institut de Recherche pour le Développement (IRD)-Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)
Subjects: pearl cultivation, calcium carbonate microstructures, [SDV]Life Sciences [q-bio], Shell (structure), Mineralogy, Shell theory, Aquatic Science, engineering.material, Biology, Edge (geometry), 03 medical and health sciences, 14. Life underwater, [SDV.IB.BIO]Life Sciences [q-bio]/Bioengineering/Biomaterials, 030304 developmental biology, 0303 health sciences, pearl layer development, Pinctada margaritifera, 04 agricultural and veterinary sciences, Mineral deposition, biomineralization, Microstructure, biology.organism_classification, eye diseases, 040102 fisheries, engineering, 0401 agriculture, forestry, and fisheries, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology, Pearl, Biomineralization
Abstract: International audience; Cultivated pearls frequently exhibit morphological irregularities making obvious that mineral deposition was irregularly distributed onto nucleus surface. Taking advantage of experimental cultivations with short durations (from 10 days to few months), these irregular deposits predating occurrence of the nacre were investigated in Polynesian pearls by biochemical characterizations and a series of physical methods. Diversity in the resulting data suggests that various in‐depth alterations of the biomineralization mechanism may have occurred during the grafting process, leading to diversity in the biochemical pathways to nacreous deposition. This allows a precise discussion of current views about pearl formation. The “reversed shell theory” is formally disproved through point to point comparison with development of the shell growing edge. Similarity of pearl formation with “regeneration” or “shell repair” is also discussed, emphasizing the differences between these concepts.
Published: 2019
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11. Colloidal Stability of Imogolite Nanotube Dispersions: A Phase Diagram Study

Author: Claire Goldmann, Véronique Peyre, Erwan Paineau, Pascale Launois, Stéphan Rouzière, Geoffrey Monet, Laboratoire de Physique des Solides (LPS), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), PHysicochimie des Electrolytes et Nanosystèmes InterfaciauX (PHENIX), and Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Nanotube, Materials science, Ionic bonding, Imogolite, 02 engineering and technology, [CHIM.INOR]Chemical Sciences/Inorganic chemistry, 010402 general chemistry, 01 natural sciences, Colloid, Phase (matter), Electrochemistry, General Materials Science, Surface charge, Spectroscopy, [CHIM.MATE]Chemical Sciences/Material chemistry, Surfaces and Interfaces, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 0104 chemical sciences, Condensed Matter::Soft Condensed Matter, Chemical engineering, Ionic strength, Volume fraction, [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph], 0210 nano-technology, [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft]
Abstract: International audience; In this article, we revisit the colloidal stability of clay imogolite nanotubes by studying the effect of electrostatic interactions on geo-inspired synthetic nanotubes in aqueous dispersions. The nanotubes in question are double-walled aluminogermanate imogolite nanotubes (Ge-DWINTs) with a well-defined diameter (4.3 nm) and with an aspect ratio around 4. Surface charge properties are assessed by electrophoretic measurements, revealing that the outer surfaces of Ge-DWINT are positively charged up to high pH values. Series of Ge-DWINT dispersions have been prepared by osmotic stress to control both ionic strength of the dispersion and the volume fraction in nanotubes. Optical observations coupled to Small and Wide-Angle X-ray Scattering (SAXS/WAXS) experiments allow us to unravel different nanotube organizations. At low ionic strength (IS < 10−2 mol.L−1), Ge-DWINTs are fully dispersed in water while they form an arrested gel phase above a given concentration threshold, which shifts towards higher volume fraction with increasing ionic strength. The swelling law, derived from the evolution of the mean intertube distance as a function of the nanotube concentration, evidences a transition from isotropic swelling at low volume fractions to one-dimensional swelling at higher volume fractions. These results show that the colloidal stability of Ge-DWINT is driven by repulsive interactions for ionic strengths lower than 10-2 mol.L-1. By contrast, higher salt concentrations lead to attractive interactions that destabilize the colloid suspension, inducing nanotube coagulation into larger structures that settle over time or form opaque gels. Detailed simulations of the WAXS diagram reveal that aggregates are mainly formed by an isotropic distribution of small bundles (less than 4 nanotubes) in which the nanotubes organized themselves in parallel orientation. Altogether, these measurements allow us to give the first overview of the phase diagram of colloidal dispersions based on geo-inspired imogolite-like nanotubes.
Published: 2019
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12. Mechanisms of Structural Reordering During Thermal Transformation of Aluminogermanate Imogolite Nanotubes

Author: Delphine Vantelon, David Maurin, Jean-Louis Bantignies, Pascale Launois, Cristina Coelho Diogo, Erwan Paineau, Geoffrey Monet, Stéphan Rouzière, Laboratoire de Physique des Solides (LPS), Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Institut des matériaux de Paris-Centre (IMPC), Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris sciences et lettres (PSL)-Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Charles Coulomb (L2C), and Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Materials science, Absorption spectroscopy, Oxide, chemistry.chemical_element, Imogolite, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, Metal, chemistry.chemical_compound, Condensed Matter::Materials Science, Aluminium, Aluminosilicate, Physical and Theoretical Chemistry, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Spectroscopy, Scattering, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, General Energy, chemistry, Chemical engineering, visual_art, visual_art.visual_art_medium, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 0210 nano-technology
Abstract: International audience; Metal oxide aluminosilicate and aluminogermanate nanotubes, called imogolite nanotubes, are custom made nanotubes with controlled diameter, morphology and organization. These nanotubes undergo major structural changes at high temperatures. Here, we report a complete analysis of the structural transformation of single and double-walled aluminogermanate nanotubes, organized or not in bundles, up to 800 • C. Complementary X-ray scattering and spectroscopy experiments were performed. The evolution of both Al and Ge atoms coordination during the transformation process was studied in-situ. Quantitative analysis of X-ray absorption spectra reveals that the dehydroxylation of nanotubes leads to intermediate stages of 'metaimogolite', which differ in the coordination of the aluminium atoms. A mechanism explaining the major structural reorganization is proposed based on atomic jump processes.
Published: 2021
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13. The crucial contribution of X-ray fluorescence spectroscopy in medicine

Author: Eddy Foy, Cristian Mocuta, Dominique Bazin, Jean-Philippe Haymann, Michel Daudon, Barbara Fayard, Hester Colboc, Solenn Reguer, Stéphan Rouzière, Laboratoire de Chimie Physique D'Orsay (LCPO), Université Paris-Sud - Paris 11 (UP11)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Chimie-Physique (LCP), Université de Cocody, Institut de Chimie Physique (ICP), Institut de Chimie du CNRS (INC)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des Solides (LPS), Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), IRAMAT - Laboratoire Métallurgies et Cultures (IRAMAT-LMC), Institut de Recherche sur les Archéomatériaux (IRAMAT), Université de Technologie de Belfort-Montbeliard (UTBM)-Université d'Orléans (UO)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Technologie de Belfort-Montbeliard (UTBM)-Université d'Orléans (UO)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Laboratoire Archéomatériaux et Prévision de l'Altération (LAPA - UMR 3685), Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M) (NIMBE UMR 3685), 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-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-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-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Synchrotron Radiation for Biomedicine = Rayonnement SynchroTROn pour la Recherche BiomédicalE (STROBE), Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Grenoble Alpes (UGA), CHU Rothschild [AP-HP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU), CHU Tenon [AP-HP], UMR S702 Remodelage et Réparation du Tissu Rénal, Institut National de la Santé et de la Recherche Médicale (INSERM), ANR-09-BLAN-0120,NANOSHAP,Hydroxyapatites substituées nanocristallisées et leurs interfaces avec les milieux biologiques(2009), ANR-12-BS08-0022,CAPYROSIS,Formation de cristaux de pyrophosphates de calcium et arthrose : études in vitro et in vivo(2012), and ANR-13-JSV1-0010,DRAPO,Identification des déterminants de la Plaque de Randall et de l'épidémie de lithiase urinaire: une approche multidisciplinaire.(2013)
Subjects: 0303 health sciences, Materials science, [SDV]Life Sciences [q-bio], 010401 analytical chemistry, Analytical chemistry, Building and Construction, 01 natural sciences, X-Ray Fluorescence Spectroscopy, 0104 chemical sciences, 03 medical and health sciences, [CHIM.ANAL]Chemical Sciences/Analytical chemistry, [CHIM]Chemical Sciences, Electrical and Electronic Engineering, [SDV.MHEP]Life Sciences [q-bio]/Human health and pathology, ComputingMilieux_MISCELLANEOUS, 030304 developmental biology
Abstract: International audience; This contribution tries to indicate to the clinician what kind of information can be investigated through X-ray fluorescence, what kind of information can be extracted from this spectroscopy and finally how it competes with other tools described in previous publications such as Fourier Transform Infrared or Raman spectroscopy, X-ray Absorption Near Edge Structure spectroscopy and X-ray diffraction. To attain this goal, several examples based on X-ray fluorescence experiments performed on biological samples namely concretions, medical devices, biological fluids as well as tissues are presented.
Published: 2021
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14. Role of initial precursors on the liquid-crystalline phase behavior of synthetic aluminogermanate imogolite nanotubes

Author: Stéphan Rouzière, Isabelle Morfin, Erwan Paineau, Geoffrey Monet, Pascale Launois, Cristina Coelho Diogo, Laboratoire de Physique des Solides (LPS), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), Institut des matériaux de Paris-Centre (IMPC), Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris sciences et lettres (PSL)-Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), MODI, Laboratoire Interdisciplinaire de Physique [Saint Martin d’Hères] (LIPhy), Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)
Subjects: Phase transition, Nanotube, Materials science, chemistry.chemical_element, Imogolite, Germanium, 02 engineering and technology, [CHIM.INOR]Chemical Sciences/Inorganic chemistry, 010402 general chemistry, 01 natural sciences, Biomaterials, Condensed Matter::Materials Science, Perchlorate, chemistry.chemical_compound, Colloid, Colloid and Surface Chemistry, Liquid crystal, Phase (matter), ComputingMilieux_MISCELLANEOUS, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Condensed Matter::Soft Condensed Matter, chemistry, Chemical engineering, 0210 nano-technology, [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft]
Abstract: Hypothesis Synthetic imogolite nanotubes form stable colloidal dispersions that may also exhibit a rich liquid-crystalline phase behavior according to the nanotube length to diameter ratio. Anisometric double-walled aluminogermanate nanotubes are now readily available through hydrothermal treatment of germanium and aluminum precursors. This work aims to assess how the self-organization behavior of these nanotubes is influenced by the nature of the precursors. Experiments Five different samples were synthesized by changing the precursors involved in the formation of either inner or outer walls, then fully characterized. From series of aqueous dispersions prepared by osmotic stress, we evaluated the phase behavior by coupling polarized optical observations and small-angle X-ray scattering. Findings The formation of anisometric nanotubes is achieved whatever the initial conditions. Their structural properties are however affected by the nature of the aluminum salt. For nanotubes synthesized with aluminum perchlorate, the dispersions present an isotropic-to-columnar phase transition with a self-organization of the nanotubes over large distances. By contrast, nanotubes synthesized with chloride and nitrate salts form only nematic or isotropic liquids and tend to group together in bi-dimensional rafts. We suggest that the different phase behaviors are related at the first order to the presence of structural vacancies in the nanotube walls.
Published: 2020
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15. Inorganic nanotube mesophases enable strong self-healing fibers

Author: Yulin Gao, Hannah S. Leese, Stéphan Rouzière, David B. Anthony, Pascale Launois, Won Jun Lee, Milo S. P. Shaffer, Erwan Paineau, Engineering & Physical Science Research Council (E, Department of Chemistry [Imperial College London], Imperial College London, Laboratoire de Physique des Solides (LPS), and Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Materials science, Composite number, General Physics and Astronomy, Imogolite, inorganic nanotubes, 02 engineering and technology, Carbon nanotube, 010402 general chemistry, 01 natural sciences, composites, Article, law.invention, Crystallinity, law, Ultimate tensile strength, Lyotropic, self-healing, General Materials Science, Fiber, Composite material, Nanoscience & Nanotechnology, Inorganic nanotube, General Engineering, polymer fibers, [CHIM.MATE]Chemical Sciences/Material chemistry, evaporation induced self-assembly, 021001 nanoscience & nanotechnology, 0104 chemical sciences, [CHIM.POLY]Chemical Sciences/Polymers, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 0210 nano-technology
Abstract: The assembly of one-dimensional nanomaterials into macroscopic fibers can improve mechanical as well as multifunctional performance. Double-walled aluminogermanate imogolite nanotubes are geo-inspired analogues of carbon nanotubes, synthesized at low temperature, with complementary properties. Here, continuous imogolite-based fibers are wet-spun within a poly(vinyl alcohol) matrix. The lyotropic liquid crystallinity of the system produces highly aligned fibers with tensile stiffness and strength up to 24.1 GPa (14.1 N tex–1) and 0.8 GPa (0.46 N tex–1), respectively. Significant enhancements over the pure polymer control are quantitatively attributed to both matrix refinement and direct nanoscale reinforcement, by fitting an analytical model. Most intriguingly, imogolite-based fibers show a high degree of healability via evaporation-induced self-assembly, recovering up to 44% and 19% of the original fiber tensile stiffness and strength, respectively. This recovery at high absolute strength highlights a general strategy for the development of high-performance healable fibers relevant to composite structures and other applications.
Published: 2020
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16. Nanostructural changes in commodity polyethylene during environmental exposure

Author: Christoper J. Garvey, Ron Demjaha, Michael P. Weir, Peter J. Halley, Bronwyn Laycock, Yu-Chieh Hsu, Marianne Impéror-Clerc, and Stéphan Rouzière
Subjects: Inorganic Chemistry, Structural Biology, General Materials Science, Physical and Theoretical Chemistry, Condensed Matter Physics, Biochemistry
Published: 2021
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17. Mechanisms of structural reordering during thermal transformation of aluminogermanate imogolite nanotubes

Author: Geoffrey Monet, Stéphan Rouzière, Delphine Vantelon, Pascale Launois, and Erwan Paineau
Subjects: Inorganic Chemistry, Structural Biology, General Materials Science, Physical and Theoretical Chemistry, Condensed Matter Physics, Biochemistry
Published: 2021
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18. Intercalated water in multi-layered graphene oxide paper: an X-ray scattering study

Author: Jesús David Núñez, Wolfgang K. Maser, Erwan Paineau, Ana M. Benito, Pascale Launois, Stéphan Rouzière, Agence Nationale de la Recherche (France), Ministerio de Economía y Competitividad (España), Gobierno de Aragón, European Commission, Paineau, Erwan [0000-0002-6776-7201], Benito, Ana M. [0000-0002-8654-7386], Maser, Wolfgang K. [0000-0003-4253-0758], Launois, Pascale [0000-0003-4314-1076], Paineau, Erwan, Benito, Ana M., Maser, Wolfgang K., Launois, Pascale, Laboratoire de Physique des Solides (LPS), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), Instituto de Carboquimica (CSIC), and Instituto de Carboquimica
Subjects: Materials science, Vapour pressure of water, Oxide, Analytical chemistry, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, General Biochemistry, Genetics and Molecular Biology, law.invention, chemistry.chemical_compound, law, Bound water, Wide-angle X-ray scattering, ComputingMilieux_MISCELLANEOUS, Graphene oxide, Graphene oxide paper, Scattering, Graphene, Water, [CHIM.MATE]Chemical Sciences/Material chemistry, Atmospheric temperature range, 021001 nanoscience & nanotechnology, 6. Clean water, 0104 chemical sciences, chemistry, WAXS, X-ray scattering modelling, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 0210 nano-technology
Abstract: X-ray scattering (XRS) experiments have been performed on multi-layered graphene oxide (GO) paper. GO can be easily hydrated as water naturally intercalates in the hydrophilic nanostructure. The effect of the intercalated water on the XRS signals is measured during dehydration under thermal treatment in the temperature range 298–473 K as well as during hydration under saturated water vapour pressure. A simple modelling of the XRS signals by taking into account the presence and the type of intercalated water (bound water or physisorbed water) is introduced. It allows an explanation of the variations of intensity and position of XRS reflections observed experimentally., EP, SR and PL benefited of a grant from the French Research National Agency under the program Investissements d’Avenir (SEDECO project, ANR-10-LABX-0035: Labex NanoSa-clay). AMB and WKM acknowledge funding from the Spanish Ministry MINECO under projects ENE2013-48816-C5-5-R and ENE2016-79282-C5-1-R with their associated European Regional Development Funds, and from the Government of Aragon under Consolidated Group programme DGA-T66-GCNN and the associated European Social Fund.
Published: 2017
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19. Graphene oxide–carbon nanotube hybrid assemblies: cooperatively strengthened OH⋯OC hydrogen bonds and the removal of chemisorbed water

Author: Wolfgang K. Maser, Stéphan Rouzière, Raul Arenal, Jesús David Núñez, Ana M. Benito, Pulickel M. Ajayan, Pascale Launois, Consejo Superior de Investigaciones Científicas (España), Ministerio de Economía y Competitividad (España), Gobierno de Aragón, and European Commission
Subjects: Nanotube, Materials science, Carbon nanotubes, Oxide, Chemisorbed water, Graphite oxide, Nanotechnology, 02 engineering and technology, Carbon nanotube, 010402 general chemistry, 01 natural sciences, law.invention, chemistry.chemical_compound, law, Supercapacitors, Graphene oxide, Graphene oxide paper, Graphene, General Chemistry, 021001 nanoscience & nanotechnology, Exfoliation joint, 0104 chemical sciences, chemistry, Chemical engineering, Hybrid materials, 0210 nano-technology, Hybrid material
Abstract: 6 Figuras, Owing to their great interest for energy storage and sensing applications, multi-layer papers consisting of graphene oxide – carbon nanotube (GO-CNT) hybrid sheets were prepared by in-situ exfoliation of graphite oxide in the presence of oxidized CNTs (oCNTs). For the first time we elucidate the influence of oCNTs on chemisorbed water (CW), i.e. water molecules inherently bound to oxygen functional groups (OFGs) of graphene oxide (GO) and responsible for irreversible structural damage upon thermal reduction processes. We show that oCNTs self-assemble onto GO sheets during the liquid phase processing steps by forming cooperatively strengthened OH···O=C hydrogen bonds between the carboxylic groups of oCNTs and OFGs of GO. At oCNT contents of about 10 to 15 wt. % this leads to the displacement of considerable amounts of CW without altering the original chemical composition of GO. Thermally reduced GO-CNT (rGO-CNT) papers reveal improved sp2 character and an enhancement of the specific capacitance by 75% with respect to thermally reduced GO (rGO), largely due to the effective removal of CW by oxidized CNTs. These findings disclose the relevance of cooperative hydrogen bonding phenomena in graphene oxide paper/film electrodes for the development of improved electrochemical energy storage and sensing devices., JDN is thankful for his CSIC PhD grant JAEPre09-01155 covering also his research stay at Rice University. WKM and AMB acknowledge financial support from Spanish MINECO and the European Regional Development Fund through project grants ENE2013-48816-C5-5-R, ENE2016-79282-C5-1-R and the Government of Aragon and the European Social Fund under project DGA-FSE-T66 CNN. RA gratefully acknowledges the support from MINECO through project grants FIS2013-46159- C3-3-P and MAT2016-79776-P. Some of the research has received funding from the European Union FP7 program under Grant Agreement 312483 ESTEEM2 (Integrated Infrastructure Initiative – I3) and from the European Union H2020 program under the grant 696656 Graphene Flagship, and H2020 Marie Skłodowska-Curie grant 642742.
Published: 2017
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20. Caractérisation clinique, chimique et morphologique des calcifications cutanées dans les ulcères de jambe

Author: H. Colboc, Stéphan Rouzière, J. Fontaine, S. Meaume, M. Daudon, C. Forasassi, M. Reby, V. Frochot, Dominique Bazin, N. Laporte, and E. Letavernier
Subjects: Dermatology
Abstract: Introduction Les ulceres de jambe concerne 4 % des patients de plus de 80 ans. Dans certains cas, ces ulceres sont associes a la presence de calcifications sous-cutanees limitant la cicatrisation. L’objectif de notre etude est de presenter les caracteristiques cliniques et biologiques des patients et de caracteriser ces calcifications sur le plan chimique et morphologique. Materiel et methodes Nous avons realise une etude retrospective (01/2018–12/2019) dans l’unite plaies et cicatrisation de l’hopital Rothschild, Paris, incluant tous les patients presentant des calcifications cliniques sur ulcere. Les parametres cliniques et biologiques etaient recueillis. Les calcifications issues de la detersion de la plaie etaient analysees en spectroscopie infrarouge (IR), microscopie electronique a balayage (MEB) et fluorescence X. Resultats Sept patients (6 F/1 H) ont ete inclus, d’âge moyen 87 ans. Les ulceres etaient d’origine mixte dans 4 cas et veineuse dans 3. La duree mediane d’evolution des ulceres etait de 2 ans. Six patients etaient hypertendus, 3 presentaient une insuffisance renale moderee, un etait diabetique et un, obese. Aucun patient n’etait traite par AVK. Six patients ont presente des episodes de colonisation a Pseudomonas aeruginosa et de dermo-hypodermite bacterienne. Les IPS etaient incompressibles dans 3 cas, montrant la presence de calcifications arterielles associees. Le bilan phosphocalcique etait normal pour tous les patients. Cinq patients ont eu une radiographie des jambes montrant systematiquement des calcifications sous-cutanees et pour 2 d’entre eux, des calcifications vasculaires associees. Pour 5 patients, des calcifications cutanees ont pu etre analysees. En IR, elles etaient constamment composees de carbapatite. L’etude en MEB montrait sur la surface de certaines un aspect crible, avec depressions d’environ un micron, evoquant des empreintes bacteriennes. La fluorescence X trouvait la presence de zinc associe au calcium et au phosphore de la calcification, traduisant l’existence de phenomenes inflammatoires associes a ces depots cutanes. Discussion Nous presentons la premiere etude chimique et morphologique de calcifications cutanees dans les ulceres. Ces ulceres etaient toujours associes a une insuffisance veineuse, probablement a l’origine d’une inflammation cutanee, comme le montre la richesse de ces depots en zinc. Cette inflammation pourrait causer une destruction des fibres elastiques les rendant propice a la calcification, comme rapporte dans d’autres dermatoses inflammatoires. Certaines bacteries pourraient egalement favoriser la formation de ces calcifications, comme observe au cours de la formation de lithiases urinaires. Ces elements orientent vers une etiologie « locale » de formation de ces calcifications, appuyee par la normalite de bilan phosphocalcique. De futures etudes structurelles, visant a etudier la degenerescence tissulaire dermique au cours de l’insuffisance veineuse, sont a prevoir.
Published: 2020
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21. Localization and characterization of thyroid microcalcifications: A histopathological study

Author: R. Weil, Stéphan Rouzière, Jean-Philippe Haymann, Sophie Périé, Emmanuel Letavernier, Dominique Bazin, Michel Daudon, Joëlle Perez, Vincent Frochot, Sophie Vandermeersch, Chantal Jouanneau, Joanne Guerlain, Marine Lefevre, Léa Huguet, Service d’Otorhino-laryngologie et de chirurgie cervicofaciale [CHU Tenon], Assistance publique - Hôpitaux de Paris (AP-HP) (APHP)-CHU Tenon [APHP], CHU Tenon [APHP], Service d’Anatomie et cytologie pathologiques [CHU Tenon], Des Maladies Rénales Rares aux Maladies Fréquentes, Remodelage et Réparation, Institut National de la Santé et de la Recherche Médicale (INSERM)-Sorbonne Université (SU), Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Pierre et Marie Curie - Paris 6 (UPMC), Remodelage et Reparation du Tissu Renal, Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de la Santé et de la Recherche Médicale (INSERM), Institut de psychiatrie et neurosciences (U894 / UMS 1266), Université Paris Descartes - Paris 5 (UPD5)-Institut National de la Santé et de la Recherche Médicale (INSERM), Service d'Explorations fonctionnelles multidisciplinaires [CHU Tenon], Laboratoire de Physique des Solides (LPS), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Chimie-Physique (LCP), Université de Cocody, Service de Néphrologie et Dialyses [CHU Tenon], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-CHU Tenon [AP-HP], Sorbonne Université (SU)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU), CHU Tenon [AP-HP], Sorbonne Université (SU)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP), Sorbonne Université (SU)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP), and Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Male, Pathology, Physiology, Molecular biology, Calcium oxalate, [CHIM.THER]Chemical Sciences/Medicinal Chemistry, 01 natural sciences, Biochemistry, chemistry.chemical_compound, 0302 clinical medicine, Medicine and Health Sciences, Thyroid Nodule, Polarized Light Microscopy, Materials, Thyroid, Oxalates, Microscopy, Multidisciplinary, Crystallography, Physics, Incidence, Light Microscopy, Calcinosis, Middle Aged, Condensed Matter Physics, 3. Good health, Nucleic acids, Chemistry, medicine.anatomical_structure, 030220 oncology & carcinogenesis, Physical Sciences, Crystal Structure, Medicine, Female, France, Anatomy, Research Article, Thyroid nodules, Adult, medicine.medical_specialty, endocrine system, Psammoma body, Adenoma, Science, Materials Science, chemistry.chemical_element, Endocrine System, Calcium, 010402 general chemistry, Research and Analysis Methods, Crystals, Calcification, 03 medical and health sciences, Sense Strands, medicine, Genetics, Solid State Physics, Humans, Colloids, Thyroid Neoplasms, Oxalate transport, Chemical Compounds, Biology and Life Sciences, DNA structure, DNA, medicine.disease, Carcinoma, Papillary, 0104 chemical sciences, Macromolecular structure analysis, chemistry, Mixtures, Case-Control Studies, Physiological Processes
Abstract: International audience; Thyroid calcification is frequent in thyroid nodules. The aim of our study was to evaluate the prevalence of calcifications in thyroid tissue samples of patients with various thyroid diseases , and to identify their composition according to their localization. Among 50 thyroid samples included, 56% were malignant (papillary carcinoma) and 44% were benign (ade-noma, multinodular goiter, Graves' disease, sarcoidosis). Calcifications were found in 95% of samples using polarised light microscopy, whereas only 12% were described in initial pathological reports. Three types were individualised and analyzed by infrared spectrometry (μFTIR): colloid calcifications composed of calcium oxalate, capsular calcifications and psammoma bodies, both composed of calcium phosphate. Of notice, psammoma bodies characterized by FE-SEM were composed of concentric structure suggesting a slow process for crystal deposition. Calcium phosphates were found only in malignant samples whereas calcium oxalate was not associated with a define pathology. Proliferation assessed by KI67 staining was high (33% of positive follicles), and RUNX2, OPN, and CD44 positive staining were detected in thyrocytes with a broad variation between samples. However, thyr-ocyte proliferation and differentiation markers were not associated with the number of crystals. TRPV5 and CaSR expression was also detected in thyrocytes. mRNA transcripts expression was confirmed in a subgroup of 10 patients, altogether with other calcium transporters such as PMCA1 or Cav1.3. Interestingly, TRPV5 mRNA expression was significantly associated with number of colloid calcifications (rho =-0.72; p = 0.02). The high prevalence of calcium oxalate crystals within colloid gel raises intriguing issues upon follicle physiology for calcium and oxalate transport.
Published: 2019
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22. How to assess the role of Pt and Zn in the nephrotoxicity of Pt anti-cancer drugs? An investigation combining μXRF and statistical analysis: Part I: On mice

Author: Alex Kellum, Christian Mocuta, Dominique Bazin, John J. Rehr, Chantal Jouanneau, Pierre Ronco, Solenn Reguer, Karine Provost, Emmanuel Esteve, Alexandre Hertig, Eric Rondeau, Dominique Thiaudière, Emmanuel Letavernier, Kris Jorissen, Stéphan Rouzière, Aurélien Bataille, and Michel Daudon
Subjects: 0301 basic medicine, Cisplatin, Chemistry(all), Chemistry, Pt anticancer drugs, General Chemical Engineering, General Chemistry, Pharmacology, New diagnosis, Carboplatin, Oxaliplatin, Nephrotoxicity, 03 medical and health sciences, chemistry.chemical_compound, 030104 developmental biology, 0302 clinical medicine, 030220 oncology & carcinogenesis, Anti cancer drugs, Chemical Engineering(all), medicine, Statistical analysis, Adverse effect, Cancer, medicine.drug
Abstract: Nephrotoxicity is a specific and serious adverse effect of cisplatin which limits its utilization. Here we present an experimental approach to decipher its mechanisms focusing on the renal distribution of Pt and Zn in cisplatin exposed mice kidneys. We combined Synchrotron Radiation (S.R.) μX-ray fluorescence with statistical treatments. μX-ray fluorescence data were collected on a set of mice biopsies after cisplatin, oxaliplatin and carboplatin injections. Even if this investigation is based on a limited number of samples, these preliminary data seem to reveal a stronger correlation between the spatial repartition of Pt and Zn for cisplatin than for the other Pt containing drugs. The cisplatin injection induced a redistribution of medullary Zn across the corticomedullary junction where histological lesions develop. These results were confirmed by evaluation of Pearson's and Manders' co-localization coefficients. These data suggest that Zn is involved in the nephrotoxicity of cisplatin. This could lead to new diagnosis, physiopathological and even therapeutical approaches.
Published: 2016
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23. Mineral studies in enamel, an exemplary model system at the interface between physics, chemistry and medical sciences

Author: Stéphan Rouzière, Lise Picaut, Arnaud Dessombz, Guilhem Lignon, and Ariane Berdal
Subjects: 0301 basic medicine, Dent, Chemistry(all), General Chemical Engineering, Mineralogy, Model system, 03 medical and health sciences, 0302 clinical medicine, stomatognathic system, Electron microscopy, Dental enamel, Microscopie électronique, Physics, Enamel paint, Diffraction des rayons X, 030206 dentistry, General Chemistry, Caractérisations physicochimiques, X-ray diffraction, stomatognathic diseases, 030104 developmental biology, visual_art, Physicochemical characterizations, visual_art.visual_art_medium, Chemical Engineering(all), Tooth, Émail dentaire, Humanities
Abstract: Resume L’email dentaire est un materiau modele pour appliquer une approche physicochimique. Des pathologies ou l’environnement peuvent induire une destruction, une degradation ou des malformations amelaires. Contrairement a la plupart des autres tissus biologiques mineralises, l’email est incapable de se regenerer naturellement. Comprendre les mecanismes de degradation de l'email presente un interet scientifique et economique. Cette revue se propose de donner un apercu bibliographique des travaux des dix dernieres annees. Les etudes de l'email par des techniques physiques ou chimiques classiques et disponibles ont ete presentees et commentees a la lumiere d'exemples recents. L'interface entre la physique, la chimie et la science orale est tres active depuis plusieurs decennies, avec un important regain au cours de ces dernieres annees en raison de l'acces a des techniques tres sensibles de la science des materiaux.
Published: 2016
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24. Structural elucidation of silica present in kidney stones coming from Burkina Faso

Author: Michel Daudon, Christian Bonhomme, Stéphan Rouzière, Richard W. Ouedraogo, Raphael Weil, Dominique Bazin, Brahima Kirakoya, G. Coulibaly, Adama Lengani, Florence Babonneau, Arnaud Dessombz, Lise Picaut, HAL-UPMC, Gestionnaire, Centre de Recherche des Cordeliers (CRC), Université Pierre et Marie Curie - Paris 6 (UPMC)-École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Université Paris Descartes - Paris 5 (UPD5)-Institut National de la Santé et de la Recherche Médicale (INSERM), Laboratoire de Physique des Solides (LPS), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Centre Hospitalier Universitaire Yalgado Ouédraogo (CHUYO), Spectroscopie, Modélisation, Interfaces pour L'Environnement et la Santé (SMiLES), Laboratoire de Chimie de la Matière Condensée de Paris (LCMCP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Collège de France (CdF (institution))-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Collège de France (CdF (institution))-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Service d'Explorations fonctionnelles multidisciplinaires [CHU Tenon], CHU Tenon [AP-HP], and Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU)
Subjects: Component, Chemistry(all), Kidney stones, General Chemical Engineering, 030232 urology & nephrology, Solid-state, Mineralogy, 010402 general chemistry, [SDV.MHEP.UN]Life Sciences [q-bio]/Human health and pathology/Urology and Nephrology, 01 natural sciences, 03 medical and health sciences, 0302 clinical medicine, Urolithiasis, Burkina Faso, medicine, Opaline silica, Lithiase urinaire, Mineral, Chemistry, Structure, General Chemistry, University hospital, medicine.disease, [SDV.MHEP.UN] Life Sciences [q-bio]/Human health and pathology/Urology and Nephrology, Silice opaline, Renal calcification, 0104 chemical sciences, Crystallography, Calcium Oxalate Crystals, Chemical Engineering(all), Amorphous silica, Calculs rénaux, Composant
Abstract: Hundred kidney stones obtained from the University Hospital of Ouagadougou (Burkina Faso) were finally characterized by a panel of complementary spectroscopic and diffraction tools. The most surprising result is the high occurrence of opaline silica as a component in these kidney stones. Opaline silica is a scarce mineral phase in renal calcification; however, we found that at least 48% of the stones had a detectable proportion of silica. SEM images demonstrate the presence of micrometric objects (of spheroidal shape) in close association with monohydrated calcium oxalate crystals. X-ray fluorescence, XRD and 29Si solid state MAS NMR demonstrate unambiguously the presence of amorphous silica, whose composition is comparable to that of natural opals. As NMR is a local spectroscopic probe, other nuclei can be probed. We demonstrate that traces of aluminium are present in the kidney stones by using 27Al solid state MAS NMR. These experiments may offer the first clues of pathological processes that are responsible for these stones., Cent calculs rénaux obtenus du CHU de Ouagadougou (Burkina Faso) ont été caractérisés par une série d'outils spectroscopiques et de diffraction complémentaires. Le résultat le plus marquant a été la très haute prévalence de la silice opaline comme composant de ces calculs. La silice opaline est un composant rare des calculs rénaux. Cependant, nous l'avons trouvée dans près de 48% des calculs, dans des proportions suffisantes pour être détectables par analyse infrarouge. Les images au MEB démontrent la présence d'objets micrométriques (de forme sphérique) en association intime avec des cristaux d'oxalate de calcium monohydraté. La fluorescence des rayons X, la diffraction des rayons X et la RMN du solide du 29Si démontrent sans ambiguïté la présence de silice amorphe, de manière comparable au cas des opales naturelles. Comme la RMN est une sonde spectroscopique locale, d'autres noyaux peuvent être détectés. Nous avons ainsi démontré que des traces d'aluminium sont présentes dans les calculs rénaux étudiés en utilisant la RMN du solide du noyau 27 Al. Ces expériences peuvent offrir les premiers éléments de réponse concernant le processus pathologique conduisant à la formation de ces calculs.
Published: 2016
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25. MOMAC: a SAXS/WAXS laboratory instrument dedicated to nanomaterials

Author: M. Amara, Benjamin Abécassis, Olivier Spalla, Blaise Fleury, Stéphan Rouzière, Olivier Taché, Philippe Joly, Antoine Thill, Pascale Launois, Laboratoire Interdisciplinaire sur l'Organisation Nanométrique et Supramoléculaire (LIONS), Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M) (NIMBE UMR 3685), 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-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-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-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des Solides (LPS), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), ANR-07-NANO-0014,ALUCINAN,Utilisation de faisceaux de lumière pour l'analyse in-situ de la croissance par CVD de nanotubes de carbone multi-feuillets(2007), and Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Materials science, 02 engineering and technology, Carbon nanotube, 010402 general chemistry, 01 natural sciences, General Biochemistry, Genetics and Molecular Biology, Nanomaterials, law.invention, Optics, law, Wide-angle X-ray scattering, Small-angle X-ray scattering, business.industry, Scattering, Detector, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Characterization (materials science), small-angle X-ray scattering, SAXS/WAXS, laboratory instruments, nanoparticles, Vacuum chamber, 0210 nano-technology, business, wide-angle X-ray scattering
Abstract: This article presents the technical characteristics of a newly built small- and wide-angle X-ray scattering (SAXS/WAXS) apparatus dedicated to structural characterization of a wide range of nanomaterials in the powder or dispersion form. The instrument is based on a high-flux rotating anode generator with a molybdenum target, enabling the assessment of highly absorbing samples containing heavy elements. The SAXS part is composed of a collimation system including a multilayer optic and scatterless slits, a motorized sample holder, a vacuum chamber, and a two-dimensional image-plate detector. All the control command is done through a TANGO interface. Normalization and data correction yield scattering patterns at the absolute scale automatically with a q range from 0.03 to 3.2 Å−1. The WAXS part features a multilayer collimating optic and a two-dimensional image-plate detector with variable sample-to-detector distances. The accessible q range is 0.4–9 Å−1, ensuring a large overlap in q range between the two instruments. A few examples of applications are also presented, namely coupled SAXS/WAXS structure and symmetry determination of gold nanocrystals in solution and characterization of imogolite nanotubes and iron-filled carbon nanotube samples.
Published: 2016
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26. Water in Carbon Nanotubes: The Peculiar Hydrogen Bond Network Revealed by Infrared Spectroscopy

Author: Erwan Paineau, J.-B. Brubach, Stéphan Rouzière, Pascale Roy, Pascale Launois, Simona Dalla Bernardina, Patrick Judeinstein, Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des Solides (LPS), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), Laboratoire Léon Brillouin (LLB - UMR 12), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Saclay, Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)
Subjects: Nanotube, water, Selective chemistry of single-walled nanotubes, Infrared spectroscopy, Nanotechnology, Nanofluidics, 02 engineering and technology, Carbon nanotube, 010402 general chemistry, 01 natural sciences, Biochemistry, Catalysis, law.invention, Colloid and Surface Chemistry, law, Molecule, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], infrared spectroscopy, hydrogen bond, [PHYS.PHYS]Physics [physics]/Physics [physics], Hydrogen bond, Chemistry, [CHIM.MATE]Chemical Sciences/Material chemistry, General Chemistry, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Optical properties of carbon nanotubes, Chemical physics, confinement, 0210 nano-technology
Abstract: International audience; A groundbreaking discovery in nanofluidics was the observation of the tremendously enhanced water permeability of carbon nanotubes, those iconic objects of nanosciences. The origin of this phenomenon is still a subject of controversy. One of the proposed explanations involves dramatic modifications of the H-bond network of nanoconfined water with respect to that of bulk water. Infrared spectroscopy is an ideal technique to follow modifications of this network through the inter- and intramolecular bonds of water molecules. Here we report the first infrared study of water uptake at controlled vapor pressure in single walled carbon nanotubes with diameters ranging from 0.7 to 2.1 nm. It reveals a predominant contribution of loose H bonds even for fully hydrated states, irrespective of the nanotube size. Our results show that, while the dominating loosely bond signature is attributed to a one-dimensional chain structure for small diameter nanotubes, this feature also results from a water layer with “free” OH (dangling) bonds facing the nanotube wall for larger diameter nanotubes. These experimental findings provide a solid reference for further modeling of water behavior in hydrophobic nanochannels.
Published: 2016
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27. Rapid and reliable diagnosis of Wilson disease using X‐ray fluorescence

Author: Jean-Charles Duclos-Vallée, Françoise Schmitt, Catherine Guettier, Slavka Kascakova, Tuan Huy Nguyen, Andrea Somogyi, Cameron M. Kewish, Christophe Sandt, Didier Samuel, Joël Poupon, Emmanuel Jacquemin, Dominique Bazin, Bruno Francou, François Le Naour, Stéphan Rouzière, Rodolphe Sobesky, Anne Dubart-Kupperschmitt, Physiopathologie et traitement des maladies du foie, Université Paris-Sud - Paris 11 (UP11)-Hôpital Paul Brousse-Institut National de la Santé et de la Recherche Médicale (INSERM), Hepatinov (DHU), Université Paris-Sud - Paris 11 (UP11)-Centre Hépato-Biliaire Paul Brousse, Ligne de lumière NANOSCOPIUM, Synchrotron SOLEIL, Laboratoire de Physique des Solides (LPS), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), Centre de Recherche en Transplantation et Immunologie (U1064 Inserm - CRTI), Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Nantes - UFR de Médecine et des Techniques Médicales (UFR MEDECINE), Université de Nantes (UN)-Université de Nantes (UN), Hémodynamique, Interaction Fibrose et Invasivité tumorales Hépatiques (HIFIH), Université d'Angers (UA), Centre hépato-biliaire (CHB), Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Hôpital Paul Brousse-Institut National de la Santé et de la Recherche Médicale (INSERM), Centre National de Référence pour la maladie de Wilson (CNR wilson), CNR Wilson, Service de Neurologie, Hôpital Lariboisière, Laboratoire de toxicologie biologique [AP-HP], Hôpital Lariboisière-Fernand-Widal [APHP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP), Ligne de lumière SMIS, Service de Génétique Moléculaire Pharmacogénétique et Hormonologie, Hôpital Bicêtre, Service d’Hépatologie et de Transplantation Hépatique Pédiatriques, AP-HP Hôpital Bicêtre (Le Kremlin-Bicêtre), Spectroscopie, Modélisation, Interfaces pour L'Environnement et la Santé (SMiLES), Laboratoire de Chimie de la Matière Condensée de Paris (LCMCP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Collège de France (CdF (institution))-Institut de Chimie du CNRS (INC)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Collège de France (CdF (institution))-Institut de Chimie du CNRS (INC), Service d’Anatomo-Pathologie [AP-HP], Hôpital Paul Brousse, d'Eggis, Gilles, Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), and Université Pierre et Marie Curie - Paris 6 (UPMC)-Collège de France (CdF (institution))-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Collège de France (CdF (institution))-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)
Subjects: 0301 basic medicine, [SDV.MHEP.AHA] Life Sciences [q-bio]/Human health and pathology/Tissues and Organs [q-bio.TO], Pathology, medicine.medical_specialty, Cirrhosis, diagnosis, [SDV.NEU.NB]Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC]/Neurobiology, chemistry.chemical_element, X-ray fluorescence, Zinc, X‐ray fluorescence spectroscopy, Pathology and Forensic Medicine, 03 medical and health sciences, 0302 clinical medicine, Cholestasis, [SDV.MHEP.AHA]Life Sciences [q-bio]/Human health and pathology/Tissues and Organs [q-bio.TO], medicine, Wilson disease, [SDV.IB] Life Sciences [q-bio]/Bioengineering, Elemental composition, [SDV.NEU.NB] Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC]/Neurobiology, [SDV.MHEP.HEG]Life Sciences [q-bio]/Human health and pathology/Hépatology and Gastroenterology, Original Articles, Long evans, medicine.disease, Copper, [SDV.MHEP.HEG] Life Sciences [q-bio]/Human health and pathology/Hépatology and Gastroenterology, Paraffin embedded, 3. Good health, X-ray fluorescence spectroscopy, 030104 developmental biology, chemistry, copper, Original Article, [SDV.IB]Life Sciences [q-bio]/Bioengineering, 030217 neurology & neurosurgery
Abstract: International audience; Wilson's disease (WD) is a rare autosomal recessive disease due to mutations of the gene encoding the copper-transporter ATP7B. The diagnosis is hampered by the variability of symptoms induced by copper accumulation , the inconstancy of the pathognomonic signs and the absence of a reliable diagnostic test. We investigated the diagnostic potential of X-ray fluorescence (XRF) that allows quantitative analysis of multiple elements. Studies were performed on animal models using Wistar rats (n = 10) and Long Evans Cinnamon (LEC) rats (n = 11), and on human samples including normal livers (n = 10), alcohol cirrhosis (n = 8), haemo-chromatosis (n = 10), cholestasis (n = 6) and WD (n = 22). XRF experiments were first performed using synchrotron radiation to address the elemental composition at the cellular level. High-resolution mapping of tissue sections allowed measurement of the intensity and the distribution of copper, iron and zinc while preserving the morphology. Investigations were further conducted using a laboratory X-ray source for irradiating whole pieces of tissue. The sensitivity of XRF was highlighted by the discrimination of LEC rats from wild type even under a regimen using copper deficient food. XRF on whole formalin-fixed paraffin embedded needle biopsies allowed profiling of the elements in a few minutes. The intensity of copper related to iron and zinc significantly discriminated WD from other genetic or chronic liver diseases with 97.6% specificity and 100% sensitivity. This study established a definite diagnosis of Wilson's disease based on XRF. This rapid and versatile method can be easily implemented in a clinical setting.
Published: 2016
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28. Unravelling the hydration mechanism in a multi-layered graphene oxide paper by in-situ X-ray scattering

Author: Pascale Launois, Wolfgang K. Maser, Ana M. Benito, Stéphan Rouzière, Erwan Paineau, Ministerio de Economía y Competitividad (España), European Commission, Gobierno de Aragón, Agence Nationale de la Recherche (France), Laboratoire de Physique des Solides (LPS), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), Instituto de Carboquimica (CSIC), and Instituto de Carboquimica
Subjects: Materials science, Oxide, Hydration, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, law.invention, chemistry.chemical_compound, Adsorption, law, Monolayer, General Materials Science, Relative humidity, ComputingMilieux_MISCELLANEOUS, Graphene oxide paper, Graphene oxide, Graphene, Scattering, General Chemistry, [CHIM.MATE]Chemical Sciences/Material chemistry, X-ray scattering, 021001 nanoscience & nanotechnology, 0104 chemical sciences, chemistry, Chemical physics, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 0210 nano-technology, Water vapor
Abstract: © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/, Hydration of a multi-layered graphene oxide (GO) paper in water vapor atmosphere was studied by in-situ X-ray scattering over a wide range of relative humidity (RH). The intercalation of water molecules physically adsorbed between GO layers induces the expansion of the interlayer distance. Two regimes of adsorption are clearly evidenced according to the variation of the interlayer distance as a function of the relative humidity. The expansion of the interlayer distance is limited to ∼1 Å for RH ranging from 6 to 53%, whereas it is ∼3.5 Å for RH 75–100%. The hydration mechanism corresponds to the progressive adsorption of water molecules onto hydrophilic sites at the surface of GO layers in the low-RH regime, then an additional water monolayer is formed in the high-RH regime., EP, SR and PL benefited of a grant from the French Research National Agency under the program Investissements d’Avenir (SEDECO project, ANR-10-LABX-0035: Labex NanoSaclay). AMB and WKM acknowledge funding from the Spanish MINEICO (project ENE2016-79282-C5-1-R), the Gobierno de Aragón (Grupo Reconocido TO3_17R) and associated EU Regional Development Funds.
Published: 2018
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29. Physicochemical analysis of human pulpal mineralization secondary to FAM20A mutations

Author: Guilhem Lignon, Fleur Beres, Cédric Mauprivez, Stéphane Simon, Ariane Berdal, Arnaud Dessombz, and Stéphan Rouzière
Subjects: 0301 basic medicine, Adult, Male, Adolescent, Amelogenesis Imperfecta, Biochemistry, Mineralization (biology), 03 medical and health sciences, 0302 clinical medicine, Calcification, Physiologic, stomatognathic system, Rheumatology, Dental Enamel Proteins, Dentin, medicine, Humans, Orthopedics and Sports Medicine, Molecular Biology, Dental Pulp, Anatomical location, Chemistry, 030206 dentistry, Cell Biology, Nephrocalcinosis, 030104 developmental biology, medicine.anatomical_structure, Mutation, Dentinogenesis, Biophysics, Female
Abstract: Dentin differs in composition and morphology depending on its anatomical location and circumstances of formation (1). Circumpulpal dentinogenesis patterns, either in a physiological or reparative c...
Published: 2018

30. De la simple hélice aux nanostructures tubulaires

Author: Erwan Paineau, Pascale Launois, Mohamed-Salah Amara, Stéphan Rouzière, Denis Petermann, Mathieu Kociak, and Céline Mariette
Subjects: General Medicine
Abstract: Le meme formalisme est utilise pour expliquer la diffraction par l’ADN et par les nanotubes de carbone ou leurs analogues d’oxydes metalliques, les nanotubes d’imogolite.La diffraction permet a la fois de determiner la structure et l’organisation des nanotubes. De la diffraction electronique a celle des rayons X, nous discutons des proprietes individuelles et d’ensemble de ces nanostructures.
Published: 2015
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31. Hybrid, Tunable-Diameter, Metal Oxide Nanotubes for Trapping of Organic Molecules

Author: Stéphan Rouzière, Olivier Taché, Marie-Eve M. Krapf, Pascale Launois, M. Amara, Antoine Thill, Erwan Paineau, Béatrice Guiose, Laboratoire de Physique des Solides (LPS), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Interdisciplinaire sur l'Organisation Nanométrique et Supramoléculaire (LIONS), Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M) (NIMBE UMR 3685), 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-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-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-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Nanotube, Materials science, General Chemical Engineering, Oxide, Selective chemistry of single-walled nanotubes, Infrared spectroscopy, Nanotechnology, Imogolite, 02 engineering and technology, General Chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, Optical properties of carbon nanotubes, chemistry.chemical_compound, Nanopore, chemistry, Materials Chemistry, [CHIM]Chemical Sciences, Molecule, 0210 nano-technology
Abstract: International audience; New developments in nanosciences and nanotechnologies are strongly dependent on our ability to synthesize well-controlled nanobuilding units, with specific properties. We report in this paper the first synthesis of hybrid single-walled imogolite nanotubes (OH)3Al2O3SixGe1?xCH3 with diameter-controlled hydrophobic nanopores varying from 1.8 to 2.4 nm. Methylation and nanotube dimensions are studied by combining infrared spectroscopy, cryo-TEM observations, and X-ray scattering measurements. We show that, in solution, the water density inside methylated nanotubes is decreased by a factor of 3 compared to the bulk value. Spontaneous confinement of bromopropanol molecules inside the nanotubes, when added to the solution, is demonstrated. These newly synthesized nanotubes may open up possibilities for water filtration or water decontamination.
Published: 2015
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32. Nature et rôle des éléments traces dans les calculs urinaires

Author: Michel Daudon, A. Dahdouh, Dominique Bazin, Stéphan Rouzière, A. Boutefnouchet, B. Hannache, and Eddy Foy
Subjects: business.industry, Urology, Whewellite, Inorganic chemistry, Cystine, Calcium oxalate, chemistry.chemical_element, Calcium, engineering.material, chemistry.chemical_compound, Adsorption, chemistry, engineering, Uric acid, Medicine, Fourier transform infrared spectroscopy, business, Weddellite
Abstract: Aim. - To assess the possible nature and role of trace elements in the pathogenesis of urinary stones. Material and method. - A series of 76 calculi from the East-Algerian region has been investigated through Fourier transform infrared spectroscopy for chemical analysis and X-ray fluorescence for detecting trace elements. Results. - Among the detected trace elements, Zn, Sr, Pb, Cu, Rb and Se, only the first three had significant values. Overall, the calcium components, namely calcium oxalate and calcium phosphate, were the most loaded by these elements contrary to organic components such as uric acid and cystine, which had low contents. Conclusion. - The correlation of contents of Zn and Sr with the stone components (carbapatite, weddellite and whewellite) suggests an adsorption of these trace elements in the case of calcium stones rather than a catalytic process. (C) 2014 Elsevier Masson SAS. All rights reserved.
Published: 2015
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33. Effect of Ionic Strength on the Bundling of Metal Oxide Imogolite Nanotubes

Author: M. Amara, Geoffrey Monet, Erwan Paineau, Véronique Peyre, Pascale Launois, Stéphan Rouzière, Laboratoire de Physique des Solides (LPS), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Interdisciplinaire sur l'Organisation Nanométrique et Supramoléculaire (LIONS), Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M) (NIMBE UMR 3685), 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-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-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-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), PHysicochimie des Electrolytes et Nanosystèmes InterfaciauX (PHENIX), Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), M.S.A. benefited of a grant from the Domaine d’Intérêt Majeur (DIM) Nano’K under thenetwork C’Nano Ile de France, Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), 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-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-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-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)
Subjects: Nanotube, Materials science, Oxide, Nanotechnology, Imogolite, Mechanical properties of carbon nanotubes, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, Metal, chemistry.chemical_compound, Condensed Matter::Materials Science, Aluminosilicate, Physical and Theoretical Chemistry, Aqueous solution, [CHIM.MATE]Chemical Sciences/Material chemistry, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Condensed Matter::Soft Condensed Matter, General Energy, Chemical engineering, chemistry, Ionic strength, visual_art, visual_art.visual_art_medium, 0210 nano-technology
Abstract: International audience; Significant developments have been proposed over the last decade in the synthesis of aluminosilicate and aluminogermanate imogolite-like nanotubes. But while liquid phase synthesis is well controlled, it is not the case for imogolite or imogolite-like nanotube arrangement in dry state. In particular, nanotubes are found to self-assemble in bundles of various sizes, which may impact the properties of the final product. Here, we investigate the effect of ionic strength on bundling of aluminogermanate single-walled imogolite nanotubes (Ge-SWINT) in aqueous suspensions and in the resulting powders after solvent evaporation. The nanotube arrangement as a function of salt concentration was studied by X-ray scattering experiments and simulations. In aqueous suspension, nanotubes bundling occurs only at high ionic strength (IS > 8 × 10$^{-2}$ mol.L$^{-1}$) while beyond this threshold, the increase of electrostatic repulsions induces a complete stabilization of individual nanotubes. After solvent evaporation, nanotube arrangement is shown to be dictated principally by the initial concentration of salt. Beyond an ionic strength of ~ 10$^{-3}$ mol.L$^{-1}$ in the starting suspension, all Ge-SWINT samples tend to form large bundles in powder, whose lattice parameter are independent of the initial salt concentrations. These experimental results clearly show that the positive surface charge of imogolite can be used to control nanotubes bundling by anion condensation.
Published: 2017
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34. Foams Stabilized by Surfactant Precipitates: Criteria for Ultrastability

Author: Anniina Salonen, Nan Wang, Huiling Du, Stéphan Rouzière, Li Zhang, and Lili Tian
Subjects: Dodecyl sulfate, Chromatography, Materials science, Bubble, Potassium, chemistry.chemical_element, 02 engineering and technology, Surfaces and Interfaces, 010402 general chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, 0104 chemical sciences, chemistry.chemical_compound, Adsorption, chemistry, Chemical engineering, Pulmonary surfactant, Electrochemistry, General Materials Science, Sodium dodecyl sulfate, 0210 nano-technology, Spectroscopy
Abstract: Foams are ultrastable when all the aging processes arrest. We make such foams by precipitating sodium dodecyl sulfate with potassium chloride during the foaming process. The precipitate crystals adsorb onto the bubble surfaces to arrest coarsening and stop drainage by blocking in the interstices around the bubbles. However, if the concentration of SDS is too high, the foams are no longer ultrastable. The transition is sudden and corresponds to the point at which significant dodecyl sulfate remains in solution. The presence of the noncrystallized surfactant allows the foam to coarsen leading to the eventual disappearance of the foams, even if the crystals in the continuous phase can still block drainage. The transition occurs as the concentration of nonsolubilized KCl becomes higher than the concentration of SDS, giving us a linear stability boundary. The system offers an interesting alternative to other types of particles because the surfactant crystals break and reform as the temperature is cycled, which makes for reusable solutions and stimulable foams.
Published: 2017

35. In-lab X-ray fluorescence and diffraction techniques for pathological calcifications

Author: Michel Daudon, Dominique Bazin, Stéphan Rouzière, Laboratoire de Physique des Solides (LPS), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), Spectroscopie, Modélisation, Interfaces pour L'Environnement et la Santé (SMiLES), Laboratoire de Chimie de la Matière Condensée de Paris (LCMCP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Collège de France (CdF (institution))-Institut de Chimie du CNRS (INC)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Collège de France (CdF (institution))-Institut de Chimie du CNRS (INC), Service d'Explorations fonctionnelles multidisciplinaires [CHU Tenon], CHU Tenon [AP-HP], Sorbonne Université (SU)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP), Des Maladies Rénales Rares aux Maladies Fréquentes, Remodelage et Réparation, Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de la Santé et de la Recherche Médicale (INSERM), HAL-UPMC, Gestionnaire, Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Collège de France (CdF (institution))-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Collège de France (CdF (institution))-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU), and Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU)
Subjects: Chemistry(all), General Chemical Engineering, 030232 urology & nephrology, X-ray fluorescence, 02 engineering and technology, engineering.material, [PHYS] Physics [physics], 03 medical and health sciences, 0302 clinical medicine, Mineral deposit, Nuclear magnetic resonance, Urolithiasis, Diagnosis, medicine, Brushite, Pathological, In-lab X-ray fluorescence, [PHYS]Physics [physics], Chemistry, Whewellite, General Chemistry, 021001 nanoscience & nanotechnology, medicine.disease, In-lab X-ray diffraction, 3. Good health, Inflammation Process, Crystallography, Chemical Engineering(all), engineering, Kidney stones, 0210 nano-technology, Weddellite
Abstract: International audience; If imaging by physical methods is probably the best well-known link between physics and medicine, other ways such as X-ray fluorescence and diffraction techniques give significant information to clinicians. In this contribution, we would like to assess different results obtained through such techniques on three main problems in urology namely Randall's plaque, brushite kidney stones and phase conversion between weddellite and whewellite. Randall's plaque is a mineral deposit at the surface of the renal papilla which is responsible for the prevalence increase of kidney stones among young people. X-ray fluorescence suggests that an inflammation process is related to Randall's plaque. X-ray fluorescence shows that brushite stones, well known to be related to some pathologies or biochemical disorders, could also be related to unexpected conditions as suggested, for example, by the high content of Br found in several brushite stones. Such results deserve further investigations to explain the origin of that element in the stones. Regarding the phase conversion from weddellite to whewellite, X-ray fluorescence data suggest that trace elements initially present in the stone remain for the major part in situ during the conversion process, which may be clinically relevant to relate the crystalline phase and etiology. X-ray fluorescence and diffraction experiments can thus give significant clues to the clinicians. These examples as well as other investigations assessed in this contribution underline a typical scientific transfer between a physics laboratory and hospital.
Published: 2016
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36. A liquid-crystalline hexagonal columnar phase in highly-dilute suspensions of imogolite nanotubes

Author: Patrick Davidson, Natalia V. Matskova, Stéphan Rouzière, Antoine Thill, Ivan Dozov, Marie-Eve M. Krapf, Erwan Paineau, Pascale Launois, Mohamed-Salah Amara, Laboratoire de Physique des Solides (LPS), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), Laboratoire Interdisciplinaire sur l'Organisation Nanométrique et Supramoléculaire (LIONS), Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M) (NIMBE UMR 3685), 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-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-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-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), ANR-11-BS08-0002,HIMO2,Imogolites hybrides et fabrication de membranes ayant une nanostructuration optimisée.(2011), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), 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-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Rayonnement Matière de Saclay (IRAMIS), and 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-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Materials science, Science, General Physics and Astronomy, Imogolite, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, Article, General Biochemistry, Genetics and Molecular Biology, Liquid crystal, Condensed Matter::Superconductivity, Electric field, Phase (matter), Lyotropic, Multidisciplinary, Aqueous solution, Nanocomposite, General Chemistry, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, 3. Good health, 0104 chemical sciences, Condensed Matter::Soft Condensed Matter, Chemical engineering, 0210 nano-technology, Columnar phase
Abstract: Liquid crystals have found wide applications in many fields ranging from detergents to information displays and they are also increasingly being used in the ‘bottom-up' self-assembly approach of material nano-structuration. Moreover, liquid-crystalline organizations are frequently observed by biologists. Here we show that one of the four major lyotropic liquid-crystal phases, the columnar one, is much more stable on dilution than reported so far in literature. Indeed, aqueous suspensions of imogolite nanotubes, at low ionic strength, display the columnar liquid-crystal phase at volume fractions as low as ∼0.2%. Consequently, due to its low visco-elasticity, this columnar phase is easily aligned in an alternating current electric field, in contrast with usual columnar liquid-crystal phases. These findings should have important implications for the statistical physics of the suspensions of charged rods and could also be exploited in materials science to prepare ordered nanocomposites and in biophysics to better understand solutions of rod-like biopolymers., Liquid crystals are grouped into four main classes—nematic, lamellar, cubic and columnar—depending on their symmetries. Here, the authors show for the first time that a columnar phase can form in suspensions of imogolite nanotubes at very low concentrations.
Published: 2016
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37. Comparative Physicochemical Analysis of Pulp Stone and Dentin

Author: Fleur Beres, Ludovic Mouton, Stéphan Rouzière, Ariane Berdal, Stéphane Simon, Juliane Isaac, Arnaud Dessombz, Centre de Recherche des Cordeliers ( CRC ), Université Pierre et Marie Curie - Paris 6 ( UPMC ) -École pratique des hautes études ( EPHE ) -Université Paris Diderot - Paris 7 ( UPD7 ) -Université Paris Descartes - Paris 5 ( UPD5 ) -Institut National de la Santé et de la Recherche Médicale ( INSERM ), UFR d’Odontologie, Université Paris Descartes - Paris 5 ( UPD5 ), Université Paris Diderot - Paris 7 ( UPD7 ), Génétique Moléculaire de la Morphogénèse, Institut Pasteur [Paris]-Centre National de la Recherche Scientifique ( CNRS ), Interfaces, Traitements, Organisation et Dynamique des Systèmes ( ITODYS UMR7086 ), Université Paris Diderot - Paris 7 ( UPD7 ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de Physique des Solides ( LPS ), Université Paris-Sud - Paris 11 ( UP11 ) -Centre National de la Recherche Scientifique ( CNRS ), Service d’Odontologie [CHU Pitié-Salpêtrière], Assistance publique - Hôpitaux de Paris (AP-HP)-CHU Pitié-Salpêtrière [APHP], Centre de Recherche des Cordeliers (CRC), Université Pierre et Marie Curie - Paris 6 (UPMC)-École Pratique des Hautes Études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Université Paris Descartes - Paris 5 (UPD5)-Institut National de la Santé et de la Recherche Médicale (INSERM), Université Paris Descartes - Paris 5 (UPD5), Université Paris Diderot - Paris 7 (UPD7), Institut Pasteur [Paris] (IP)-Centre National de la Recherche Scientifique (CNRS), Interfaces, Traitements, Organisation et Dynamique des Systèmes (ITODYS (UMR_7086)), Université Paris Diderot - Paris 7 (UPD7)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des Solides (LPS), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), CHU Pitié-Salpêtrière [AP-HP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU), Université Paris Diderot - Paris 7 (UPD7)-École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Descartes - Paris 5 (UPD5)-Institut National de la Santé et de la Recherche Médicale (INSERM), Centre National de la Recherche Scientifique (CNRS)-Institut Pasteur [Paris], Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-CHU Pitié-Salpêtrière [AP-HP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU)-Sorbonne Université (SU), HAL-UPMC, Gestionnaire, Université Pierre et Marie Curie - Paris 6 (UPMC)-École pratique des hautes études (EPHE), Service d'Odontologie = Service de médecine Bucco-dentaire [CHU Pitié-Salpêtrière], and Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU)
Subjects: Adult, Male, 0301 basic medicine, Mineralized tissues, [SDV.MHEP.AHA] Life Sciences [q-bio]/Human health and pathology/Tissues and Organs [q-bio.TO], Materials science, [ SDV.MHEP.AHA ] Life Sciences [q-bio]/Human health and pathology/Tissues and Organs [q-bio.TO], Root canal, Carious Dentin, Dentistry, Mineralization (biology), Apatite, 03 medical and health sciences, 0302 clinical medicine, X-Ray Diffraction, stomatognathic system, Metals, Heavy, Dentin, medicine, [SDV.MHEP.AHA]Life Sciences [q-bio]/Human health and pathology/Tissues and Organs [q-bio.TO], Humans, Tooth Root, General Dentistry, Dental Pulp, Aged, Odontoblasts, business.industry, Spectrometry, X-Ray Emission, 030206 dentistry, Middle Aged, Pulp stone, Incisor, stomatognathic diseases, 030104 developmental biology, medicine.anatomical_structure, Odontoblast, visual_art, Microscopy, Electron, Scanning, visual_art.visual_art_medium, Dental Pulp Calcification, Female, Dental Pulp Cavity, business
Abstract: Introduction Odontoblasts are responsible for the synthesis of dentin throughout the life of the tooth. Tooth pulp tissue may undergo a pathologic process of mineralization, resulting in formation of pulp stones. Although the prevalence of pulp stones in dental caries is significant, their development and histopathology are poorly understood, and their precise composition has never been established. The aim of the present study was to investigate the physicochemical properties of the mineralized tissues of teeth to elucidate the pathologic origin of pulp stones. Methods Areas of carious and healthy dentin of 8 decayed teeth intended for extraction were analyzed and compared. In addition, 6 pulp stones were recovered from 5 teeth requiring root canal treatment. The samples were embedded in resin, sectioned, and observed by scanning electron microscopy and energy-dispersive spectroscopy. X-ray diffraction was performed to identify phases and crystallinity. X-ray fluorescence provided information on the elemental composition of the samples. Results Pulp stones showed heterogeneous structure and chemical composition. X-ray diffraction revealed partially carbonated apatite. X-ray fluorescence identified P, Ca, Cu, Zn, and Sr within dentin and pulp stones. Zn and Cu concentrations were higher in pulp stones and carious dentin compared with healthy dentin. Conclusions Pulpal cells produce unstructured apatitic mineralizations containing abnormally high Zn and Cu levels.
Published: 2016
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38. Calcium oxalate precipitation by diffusion using laminar microfluidics: toward a biomimetic model of pathological microcalcifications

Author: Laure Bonhomme-Coury, César Leroy, Michel Daudon, Dominique Bazin, Ivan T. Lucas, Stéphan Rouzière, G. Laffite, Christian Bonhomme, Ali Abou-Hassan, Vincent Frochot, Jean-Philippe Haymann, Emmanuel Letavernier, Florence Babonneau, PHysicochimie des Electrolytes et Nanosystèmes InterfaciauX (PHENIX), Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Chimie de la Matière Condensée de Paris (LCMCP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Collège de France (CdF (institution))-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Spectroscopie, Modélisation, Interfaces pour L'Environnement et la Santé (SMiLES), Université Pierre et Marie Curie - Paris 6 (UPMC)-Collège de France (CdF (institution))-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Collège de France (CdF (institution))-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), CHU Tenon [AP-HP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU), Laboratoire de Physique des Solides (LPS), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Interfaces et Systèmes Electrochimiques (LISE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Labex Matisse Labex MICHEM, ANR-11-IDEX-0004,SUPER,Sorbonne Universités à Paris pour l'Enseignement et la Recherche(2011), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Sorbonne Université (SU)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP), and Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Surface Properties, Microfluidics, 030232 urology & nephrology, Biomedical Engineering, Calcium oxalate, chemistry.chemical_element, Mineralogy, Bioengineering, 02 engineering and technology, Calcium, Kidney, Biochemistry, Oxalate, Diffusion, 03 medical and health sciences, chemistry.chemical_compound, 0302 clinical medicine, Biomimetics, Microfluidic channel, Chemical Precipitation, Humans, [CHIM]Chemical Sciences, Particle Size, Calcium Oxalate, Precipitation (chemistry), Calcinosis, [SPI.MECA.BIOM]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Biomechanics [physics.med-ph], Laminar flow, General Chemistry, [CHIM.MATE]Chemical Sciences/Material chemistry, Microfluidic Analytical Techniques, 021001 nanoscience & nanotechnology, chemistry, Chemical engineering, [SDV.IB]Life Sciences [q-bio]/Bioengineering, Particle size, 0210 nano-technology
Abstract: International audience; The effect of mixing calcium and oxalate precursors by diffusion at miscible liquid interfaces on calcium oxalate crystalline phases, and in physiological conditions (concentrations and flow rates), is studied using a microfluidic channel. This channel has similar dimensions as the collection duct in human kidneys and serves as a biomimetic model in order to understand the formation of pathological microcalcifications.
Published: 2016
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39. How to assess the role of Pt and Zn in the nephrotoxicity of Pt anti-cancer drugs?: An investigation combining mXRF and statistical analysis. Part II: Clinical application

Author: Emmanuel Esteve, Michel Daudon, John J. Rehr, Pierre Ronco, Alexandre Hertig, Christian Mocuta, Alex Kellum, Eric Rondeau, Emmanuel Letavernier, Dominique Bazin, Jean Philippe Haymann, Aurélien Bataille, Karine Provost, Kris Jorissen, Stéphan Rouzière, Solenn Reguer, Chantal Jouanneau, Des Maladies Rénales Rares aux Maladies Fréquentes, Remodelage et Réparation, Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de la Santé et de la Recherche Médicale (INSERM), Spectroscopie, Modélisation, Interfaces pour L'Environnement et la Santé (SMiLES), Laboratoire de Chimie de la Matière Condensée de Paris (LCMCP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Collège de France (CdF (institution))-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Collège de France (CdF (institution))-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des Solides (LPS), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Collège de France (CdF (institution))-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie et des Matériaux Paris-Est (ICMPE), Institut de Chimie du CNRS (INC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), University of Washington [Seattle], CHU Tenon [AP-HP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Collège de France (CdF (institution))-Institut de Chimie du CNRS (INC)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Collège de France (CdF (institution))-Institut de Chimie du CNRS (INC), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Collège de France (CdF (institution))-Institut de Chimie du CNRS (INC), Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Sorbonne Université (SU)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP), and HAL UPMC, Gestionnaire
Subjects: 0301 basic medicine, 030103 biophysics, Chemistry(all), General Chemical Engineering, Nanotechnology, Pt-based anti-cancer drugs X-ray fluorescence, Nephrotoxicity, Synchrotron, 03 medical and health sciences, 0302 clinical medicine, Ototoxicity, [CHIM] Chemical Sciences, Biopsy, Medicine, Distribution (pharmacology), [CHIM]Chemical Sciences, Statistical analysis, medicine.diagnostic_test, business.industry, Neurotoxicity, General Chemistry, medicine.disease, 3. Good health, Oxaliplatin, 030220 oncology & carcinogenesis, Toxicity, Chemical Engineering(all), Cancer research, business, medicine.drug
Abstract: International audience; In this contribution, an approach developed previously for mice is used for human biopsy. In the case of patient 1, Pt detection is performed 6 days after the last oxaliplatin infusion, while for patient 2, the biopsy was performed more than 15 days after his first platin infusion and several dialysis. Even for these biological samples, experiments show that synchrotron mediated mXRF is a suitable tool to detect Pt in kidney biopsy, and thus probably for any organ exposed to Pt. Therefore, mXRF could also be of major interest to decipher the mechanism beyond Pt induced neurotoxicity, ototoxicity on human biopsy. Pharmacoavailability of chemotherapies is a major concern because some treatment failures are explained by poor tumor penetration of the active molecule. mXRF could be an elegant way to map the distribution of Pt inside cancerous cells at the micrometer scale. Pt and Zn are only two of the numerous trace elements that mXRF can detect; heavy metal intoxication diagnosis and the toxicity mechanism probably could also benefit from this innovative technique.
Published: 2016
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40. Deformations and Thermal Modifications of Imogolite

Author: Stéphan Rouzière, Pascale Launois, Erwan Paineau, and M. Amara
Subjects: Materials science, Scattering, Nanotechnology, Imogolite, Mullite, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Structural transformation, 0104 chemical sciences, Aluminosilicate, Chemical physics, Thermal, Lamellar structure, Deformation (engineering), 0210 nano-technology
Abstract: Imogolites, which are aluminosilicate or aluminogermanate nanotubes, are usually known as cylindrical nanotubes. However, in powders, deformations or further structural modifications of these nanotubes occur due to intertube interactions or under the action of temperature. Depending on whether they are organised in bundles or not, ovalisation or hexagonalisation phenomena are reported, based on detailed X-ray scattering (XRS) studies. The basics of XRS and the specific models developed for investigating such structural modifications are presented. Finally, thermally induced structural transformations, from the dehydroxylation process to the lamellar and high-temperature mullite phases, are reviewed.
Published: 2016
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41. Tailoring Highly Oriented and Micropatterned Clay/Polymer Nanocomposites by Applying an a.c. Electric Field

Author: Marie-Eve M. Krapf, Adrian-Marie Philippe, Patrick Davidson, Ivan Dozov, Stéphan Rouzière, Isabelle Bihannic, Erwan Paineau, Christophe Baravian, and Laurent J. Michot
Subjects: chemistry.chemical_classification, Polarized light microscopy, Materials science, Nanocomposite, chemistry, Polymerization, Polymer nanocomposite, Electric field, Self-healing hydrogels, General Materials Science, Polymer, Composite material, Exfoliation joint
Abstract: Clay/polymer nanocomposites have recently raised much interest because of their widespread industrial applications. Nevertheless, controlling both clay platelet exfoliation and orientation during polymerization still remains challenging. Herein, we report the elaboration of clay/polymer nanocomposite hydrogels from aqueous suspensions of natural swelling clays submitted to high-frequency a.c. electric fields. X-ray scattering experiments have confirmed the complete exfoliation of the clay sheets in the polymer matrix, even after polymerization. Moreover, polarized light microscopy shows that the clay platelets were perfectly oriented by the electric field and that this field-induced alignment was frozen in by in situ photopolymerization. This procedure allowed us to not only produce uniformly aligned samples but also pattern platelet orientation, at length scales down to 20 μm. This straightforward and cheap nanocomposite patterning technique can be easily extended to a wide range of natural or synthetic inorganic anisotropic particles.
Published: 2012
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42. Diversité chimique des calculs prostatiques : une investigation par MEB et spectroscopie infrarouge

Author: Stéphan Rouzière, P. Méria, Eddy Foy, Dominique Bazin, Raphaël Weil, Michel Daudon, and Arnaud Dessombz
Subjects: business.industry, Urology, Medicine, business, Humanities
Abstract: Resume Objectif Donner une vue synthetique des phases cristallines existentes dans les calculs prostatiques, en insistant sur la diversite physico-chimique de ces phases. Materiel et methode Un ensemble de 32 calculs prostatiques provenant de patients traites dans differents hopitaux ont ete analyses par spectroscopie infrarouge a transformee de Fourier (IR-TF) et par microscopie electronique a balayage (MEB). Resultats L’analyse par infrarouge a permis de determiner les phases et leurs proportions au sein de chaque calcul prostatique. La topologie de ces phases a egalement ete etudiee par MEB. L’ensemble de ces donnees a mis en evidence la preponderance des phosphates calciques, majoritaires dans 90,7 % des cas, mais aussi l’existence de nouvelles phases chimiques jusqu’ici non-repertoriees dans la litterature, telles que la brushite ou le phosphate octocalcique pentahydrate. Conclusion L’analyse des calculs prostatiques a revele une diversite chimique et structurale plus grande que celle rapportee a ce jour. Comme pour les calculs urinaires, il pourrait etre interessant sur le plan clinique, de rechercher les correlations entre les caracteristiques morpho-constitutionnelles des calculs prostatiques et les facteurs etio-pathogeniques.
Published: 2011
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43. Is the pearl layer a reversed shell? A re-examination of the theory of pearl formation through physical characterizations of pearl and shell developmental stages inPinctada margaritifera

Author: Stéphan Rouzière, Julius Nouet, Murielle Salomé, Jean-Pierre Cuif, Yannicke Dauphin, and L. Howard
Subjects: Materials science, biology, Pearl oyster, Pinctada margaritifera, Shell (structure), Mineralogy, Anatomy, Aquatic Science, Backscattered electron, engineering.material, biology.organism_classification, eye diseases, Characterization methods, engineering, Pearl, Secretion Processes, PINCTADA MARGARITIFERA SHELL
Abstract: A series of physical characterization methods (UV fluorescence microscopy, X-ray microdiffraction, backscattered electron imaging and X-ray absorption spectroscopy) were applied to Polynesian pearls collected after different cultivation periods, varying from three weeks to eighteen months. Through this rigorous time-based sampling, 120 pearls produced by 20 different donor oysters were compared. Results show that the structure of the pearl layer can be understood as a sequence of distinct secretion processes whose progressive occurrence through time may lead to variously arranged and sometimes aberrant mineralized structures. By making comparisons with the structure and growth mode of the Pinctada margaritifera shell, this study shows that the currently accepted theory that views the pearl-bed as a "reversed shell" cannot account for the diversity of the microstructural patterns and mineralogical properties observed in the pearl layers. From a practical and economic view point, it appears that development of these pre-nacreous materials superposed onto a perfectly round-shaped nucleus is the main cause of shape irregularities in pearls and the consequent decrease in their value.
Published: 2011
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44. Structural resolution of inorganic nanotubes with complex stoichiometry

Author: Pascale Launois, Geoffrey Monet, Amara, Erwan Paineau, and Stéphan Rouzière
Subjects: Inorganic Chemistry, Materials science, Structural Biology, Resolution (electron density), Analytical chemistry, General Materials Science, Physical and Theoretical Chemistry, Condensed Matter Physics, Biochemistry, Stoichiometry
Published: 2018
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45. In situ time resolved wide angle X-Ray diffraction study of nanotube carpet growth: nature of catalyst particles and progressive nanotube alignment

Author: Erik Elkaim, Pascale Launois, Martine Mayne-L’Hermite, Stéphan Rouzière, Dominique Porterat, Cristian Mocuta, Mathieu Pinault, Perine Landois, Laboratoire de Physique des Solides (LPS), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), Laboratoire Edifices Nanométriques (LEDNA), Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M) (NIMBE UMR 3685), 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-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-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-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), ANR-07-NANO-0014,ALUCINAN,Utilisation de faisceaux de lumière pour l'analyse in-situ de la croissance par CVD de nanotubes de carbone multi-feuillets(2007), 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-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Institut Rayonnement Matière de Saclay (IRAMIS), and 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-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)
Subjects: Nanotube, carbon nanotubes, XRD, in situ, Materials science, carbon nanotubes, XRD, in situ, Nanowire, Nucleation, Nanotechnology, General Chemistry, Carbon nanotube, [CHIM.MATE]Chemical Sciences/Material chemistry, Synchrotron, law.invention, law, Phase (matter), X-ray crystallography, General Materials Science, Orthorhombic crystal system
Abstract: International audience; Abstract Catalytic Chemical Vapor Deposition is the most promising process to obtain Vertically Aligned Carbon Nanotube (VACNT) carpets. Live analysis of growing VACNT is crucial to reveal their nucleation and growth mechanisms. We present novel time resolved in situ X-ray diffraction (XRD) analysis on growing macroscopic VACNT carpets enabling us to get statistical information on catalytic phase together with nanotube progressive alignment. A specific synthesis set-up has been developed to perform such in situ synchrotron XRD experiments. Nucleation kinetics of the different phases are evidenced: first, orthorhombic Fe3C crystalline phase is formed, followed by the formation of CNTs and finally of γ-Fe, demonstrating that Fe3C particles are the nucleation seeds for CNT growth. The additional formation of Fe3C or γ-Fe nanowires inside CNTs is associated with capillary forces and mobility of them at 850°C. Experiments also reveal the progressive formation and alignment of VACNT carpets during the continuous precursor injection. Quantification of the alignment degree allows one to get a better understanding of the effect of precursor injection rate and CNT length on VACNT alignment. The overall results are key issues for the scaling-up of VACNT synthesis and their applications towards commercialization.
Published: 2015
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46. Structure in Nascent Carbon Nanotubes Revealed by Spatially Resolved Raman Spectroscopy

Author: Pascale Launois, Valérie Reita, Perine Landois, Mickaël Huard, Nedjma Bendiab, Martine Mayne-L’Hermite, Stéphan Rouzière, Mathieu Pinault, Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Francis PERRIN (LFP - URA 2453), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Edifices Nanométriques (LEDNA), Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M) (NIMBE UMR 3685), 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-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-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-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Laboratoire de Physique des Solides (LPS), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), Optique et microscopies (POM), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF), Systèmes hybrides de basse dimensionnalité (HYBRID), ANR-07-NANO-0014,ALUCINAN,Utilisation de faisceaux de lumière pour l'analyse in-situ de la croissance par CVD de nanotubes de carbone multi-feuillets(2007), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS), 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-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-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-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Optique & Microscopies (NEEL - POM), and Systèmes hybrides de basse dimensionnalité (NEEL - HYBRID)
Subjects: Diffraction, Nanotube, Materials science, Analytical chemistry, Nucleation, chemistry.chemical_element, Aligned-MWNT, 02 engineering and technology, Carbon nanotube, 010402 general chemistry, 01 natural sciences, Catalysis, law.invention, symbols.namesake, Condensed Matter::Materials Science, law, Materials Chemistry, mapping, X-Ray microdiffraction, Metals and Alloys, spatially resolved Raman spectroscopy, Surfaces and Interfaces, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, chemistry, Chemical physics, symbols, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Particle, 0210 nano-technology, Raman spectroscopy, co-localisation, Carbon
Abstract: The understanding of carbon nanotube (CNT) growth is crucial for the control of their production. In particular, the identification of structural changes of carbon possibly occurring near the catalyst particle in the very early stages of their formation is of high interest. In this study, samples of nascent CNT obtained during nucleation step and samples of vertically aligned CNT obtained during growth step are analysed by combined spatially resolved Raman spectroscopy and X-ray diffraction measurements. Spatially resolved Raman spectroscopy reveals that iron-based phases and carbon phases are co-localized at the same position, and indicates that sp2 carbon nucleates preferentially on iron-based particles during this nucleation step. Depth scan Raman spectroscopy analysis, performed on nascent CNT, highlights that carbon structural organisation is significantly changing from defective graphene layers surrounding the iron-based particles at their base up to multi-walled nanotube structures in the upper part of iron-based particles.
Published: 2014
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47. Vertically aligned carbon nanotube-based composite: Elaboration and monitoring of the nanotubes alignment

Author: Pascale Launois, Stéphanie Patel, Mickaël Huard, Martine Mayne-L’Hermite, Mathieu Pinault, Florent Roussel, Stéphan Rouzière, Laboratoire de Physique des Solides (LPS), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Francis PERRIN (LFP - URA 2453), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Edifices Nanométriques (LEDNA), Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M) (NIMBE UMR 3685), 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-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-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-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), 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-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Institut Rayonnement Matière de Saclay (IRAMIS), and 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-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)
Subjects: Nanotube, Materials science, Polymers and Plastics, Composite number, Nanotechnology, Carbon nanotube, composites, law.invention, nanotubes, X-ray, law, graphene and fullerenes, Materials Chemistry, Composite material, Elaboration, chemistry.chemical_classification, General Chemistry, Polymer, Epoxy, Surfaces, Coatings and Films, Characterization (materials science), [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, Membrane, chemistry, membranes, visual_art, visual_art.visual_art_medium, microscopy
Abstract: We present the different elaboration steps of a composite formed of carbon nanotubes (CNT) carpet embedded in an epoxy polymer. Detailed characterization at each step of the elaboration process is performed. The good alignment of CNT in as-grown carpets is kept all along the elaboration process of the composite, as it is measured at both macro and microscopic scales by X-ray scattering. We also ensured by X-ray fluorescence measurements that the iron-based catalyst particles used for the synthesis were removed from the carpet after a high temperature post-annealing treatment. These measurements give valuable information for further applications involving unidirectional nanotube composites and membranes, where CNT alignment is a key parameter. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 39730.
Published: 2014
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48. The status of strontium in biological apatites: an XANES/EXAFS investigation

Author: Michel Daudon, Christelle Nguyen, Stéphan Rouzière, Frédéric Lioté, Dominique Thiaudière, John J. Rehr, Christine Chappard, Dominique Bazin, Solen Reguer, Hang-Korng Ea, Arnaud Dessombz, Bazin, Dominique, Laboratoire de Chimie de la Matière Condensée de Paris (LCMCP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Collège de France (CdF (institution))-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des Solides (LPS), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Os et articulations, Université Paris Diderot - Paris 7 (UPD7)-Institut National de la Santé et de la Recherche Médicale (INSERM), Service Rhumatologie, Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Hôpital Lariboisière-Fernand-Widal [APHP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Université Paris Diderot - Paris 7 (UPD7), Department of Physics [Seattle], University of Washington [Seattle], Bioingénierie et Bioimagerie Ostéo-articulaires, Biomécanique et Biomatériaux Ostéo-Articulaires (B2OA (UMR_7052)), École nationale vétérinaire - Alfort (ENVA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), CHU Tenon [AP-HP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Collège de France (CdF (institution))-Institut de Chimie du CNRS (INC), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), École nationale vétérinaire d'Alfort (ENVA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Sorbonne Université (SU)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP), and Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-École nationale vétérinaire d'Alfort (ENVA)
Subjects: Nuclear and High Energy Physics, Osteoporosis, Ab initio, chemistry.chemical_element, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, Apatite, Calcification, Physiologic, Nuclear magnetic resonance, Apatites, medicine, Humans, Instrumentation, X-ray absorption spectroscopy, Strontium, Radiation, [SDV.MHEP] Life Sciences [q-bio]/Human health and pathology, Extended X-ray absorption fine structure, Chemistry, Calcinosis, Spectrometry, X-Ray Emission, 021001 nanoscience & nanotechnology, medicine.disease, XANES, 3. Good health, 0104 chemical sciences, Crystallography, X-Ray Absorption Spectroscopy, visual_art, visual_art.visual_art_medium, 0210 nano-technology, [SDV.MHEP]Life Sciences [q-bio]/Human health and pathology, Calcification
Abstract: Osteoporosis represents a major public health problem through its association with fragility fractures. The public health burden of osteoporotic fractures will rise in future generations, due in part to an increase in life expectancy. Strontium-based drugs have been shown to increase bone mass in postmenopausal osteoporosis patients and to reduce fracture risk but the molecular mechanisms of the action of these Sr-based drugs are not totally elucidated. The local environment of Sr2+cations in biological apatites present in pathological and physiological calcifications in patients without such Sr-based drugs has been assessed. In this investigation, X-ray absorption spectra have been collected for 17 pathological and physiological calcifications. These experimental data have been combined with a set of numerical simulations using theab initioFEFF9X-ray spectroscopy program which takes into account possible distortion and Ca/Sr substitution in the environment of the Sr2+cations. For selected samples, Fourier transforms of the EXAFS modulations have been performed. The complete set of experimental data collected on 17 samples indicates that there is no relationship between the nature of the calcification (physiological and pathological) and the adsorption mode of Sr2+cations (simple adsorption or insertion). Such structural considerations have medical implications. Pathological and physiological calcifications correspond to two very different preparation procedures but are associated with the same localization of Sr2+versusapatite crystals. Based on this study, it seems that for supplementation of Sr at low concentration, Sr2+cations will be localized into the apatite network.
Published: 2014
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49. Imogolite nanotubes: a 2D x-ray scattering study of films of oriented samples

Author: Stéphan Rouzière, Antoine Thill, Erwan-Nicolas Paineau, Mohamed-Salah Amara, Pascale Launois, Céline Mariette, Laboratoire de Physique des Solides (LPS), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Interdisciplinaire sur l'Organisation Nanométrique et Supramoléculaire (LIONS), Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M) (NIMBE UMR 3685), 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-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-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-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), 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-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Institut Rayonnement Matière de Saclay (IRAMIS), and 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-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)
Subjects: Materials science, Mechanical properties of carbon nanotubes, inorganic nanotubes, 02 engineering and technology, Carbon nanotube, 010403 inorganic & nuclear chemistry, 01 natural sciences, Biochemistry, law.invention, Inorganic Chemistry, Optics, Structural Biology, law, [CHIM]Chemical Sciences, General Materials Science, Physical and Theoretical Chemistry, Nanoscopic scale, Condensed matter physics, business.industry, Scattering, 2D scattering, X-ray, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 0104 chemical sciences, Optical properties of carbon nanotubes, Reciprocal lattice, 0210 nano-technology, business, Powder diffraction
Abstract: International audience; Inorganic nanotubes represent an emerging class of nanobuilding blocks. Among them, imogolites are alumino-silicate or alumino-germanate nanotubes with well controlled diameter and helicity. As such, they constitute a model platform for the study of molecular interactions and confinement at the nanoscale, complementing the one constituted by carbon nanotubes. We focus here on double-walled alumino-germanate nanotubes, discovered very recently [1]. They are formed of two concentric tubes (figure inset), with respective internal diameters of 1.6 and 3.1nm and up to 1 micron in length [2]. We report the first experimental study, using wide angle x-ray scattering, performed on films of oriented nanotubes (figure). Structural changes of the nanotubes and behavior of the confined water under heating are investigated in-situ. The study of oriented samples gives new information that is not available with powder diffraction. Above all, the contribution to the scattering signal of internal and external tubes can be separated as well as the translational/rotational correlations. The use of wide image plate detectors allows one to access large area of the reciprocal space in a single image. Simulations of the two-dimensionnal scattering diagrams will be presented. A key question, the correlation between internal and external tube, which is of great interest for understanding friction properties at the nanoscale, will be discussed.
Published: 2014

50. Hexagonalization of Aluminogermanate Imogolite Nanotubes Organized into Closed-Packed Bundles

Author: Pascale Launois, M. Amara, Stéphan Rouzière, Maria Bacia-Verloop, Antoine Thill, Erwan Paineau, Laboratoire de Physique des Solides (LPS), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Interdisciplinaire sur l'Organisation Nanométrique et Supramoléculaire (LIONS), Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M) (NIMBE UMR 3685), 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-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-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-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut de biologie structurale (IBS - UMR 5075 ), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), 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)-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), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Nanotube, Thermogravimetric analysis, Materials science, Scattering, Hexagonal crystal system, Infrared spectroscopy, chemistry.chemical_element, Germanium, Imogolite, Nanotechnology, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Condensed Matter::Materials Science, General Energy, chemistry, Chemical engineering, [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph], Physical and Theoretical Chemistry
Abstract: International audience; Imogolite nanotubes are promising building blocks for nanotechnologies with potential applications in molecular separation, molecular storage, or catalysis. We present an experimental study of the structure of germanium-based imogolite nanotubes Al2O3Ge(OH)4 arranged in bundles. It combines cryo-transmission electron microscopy, infrared spectroscopy, thermogravimetric measurements, and X-ray scattering experiments. Thanks to a systematic method developed to analyze X-ray scattering diagrams as a function of the nanotube shape, single-walled germanium-based imogolite nanotubes, known as cylindrical for more than 30 years, are shown to take an hexagonal base shape when arranged in bundles. Physical and chemical properties of hexagonal imogolite nanotubes should markedly differ from those of cylindrical ones, making hexagonal basis nanotubes a ?new? member, of particular interest, of the rich family of imogolites.
Published: 2014
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