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24 results on '"Sophie Neveu"'

1. All-Fiber Magneto-Optical Effect Using Nanoparticles Doped Sol-Gel Thin Film Deposited Within Microstructured Fibers

Author

Alexis Dufour, Stéphanie Reynaud, Sylvain Girard, Damien Jamon, Sophie Neveu, Laure Bsawmaii, Emmanuel Marin, Francois Royer, Laboratoire Hubert Curien [Saint Etienne] (LHC), Université Jean Monnet [Saint-Étienne] (UJM)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS), 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
Materials science, Optical fiber, Physics::Optics, Nanoparticle, 02 engineering and technology, engineering.material, 7. Clean energy, law.invention, symbols.namesake, 020210 optoelectronics & photonics, Coating, law, Faraday effect, 0202 electrical engineering, electronic engineering, information engineering, Fiber, Thin film, ComputingMilieux_MISCELLANEOUS, Sol-gel, [PHYS]Physics [physics], business.industry, Atomic and Molecular Physics, and Optics, Core (optical fiber), engineering, symbols, Optoelectronics, business
Abstract

An innovative functionalization method allowing to greatly increase the Faraday effect of microstructured silica-based optical fibers is described. This method relies on the coating of a sol-gel thin film doped with magnetic field sensitive cobalt ferrite nanoparticles around the suspended core of the fiber. By varying the functionalization process parameters, both the film thickness and nanoparticle concentrations can be tailored to optimize the fiber magneto-optical response by a proper adjustment the interaction between the guided mode and the composite film. Experimental measurements in an all-fiber configuration on several samples diversely functionalized show a significant polar magneto-optical effect. A polarization rotation as large as 10° has been measured at 1550 nm when the most efficiently functionalized fiber is located inside a 0.7 cm air gap electromagnet at 1 Tesla. The present method and the developed all-fiber components are very promising candidates for the design of fiber-based sensors of magnetic fields.

Published
2021

2. Small CoFe2O4 magnetic nanoparticles in ferrofluids, influence of the synthesis on the magnetic anisotropies

Author

Marie-Anne Arrio, Sophie Neveu, Philippe Ohresser, Véronica Gavrilov, Amélie Juhin, Philippe Sainctavit, Niéli Daffé, Fadi Choueikani, Vincent Dupuis, Institut de minéralogie, de physique des matériaux et de cosmochimie (IMPMC), Muséum national d'Histoire naturelle (MNHN)-Institut de recherche pour le développement [IRD] : UR206-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), 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
[PHYS]Physics [physics], 010302 applied physics, Ferrofluid, Materials science, Absorption spectroscopy, Magnetic circular dichroism, chemistry.chemical_element, Nanoparticle, 02 engineering and technology, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Electronic, Optical and Magnetic Materials, Magnetic anisotropy, chemistry, Interstitial defect, 0103 physical sciences, Physical chemistry, Magnetic nanoparticles, 0210 nano-technology, Cobalt
Abstract

The magnetic properties of cobalt ferrites nanoparticles prepared using three different processes (thermal decomposition, polyol and co-precipitation synthesis routes) are investigated by X-ray Absorption Spectroscopy and X-ray Magnetic Circular Dichroism. The repartition of cobalt and iron ions amongst the interstitial sites of the spinel structure is determined and correlated with their magnetic properties. The study reports on the influence of the synthesis method on the crystallographic order within a nanoparticle, and hence, on the magnetic anisotropy.

Published
2019

3. Self-biased magneto-optical films based on CoFe 2 O 4 –silica nanocomposite

Author

M.-F. Blanc-Mignon, Y. Lefkir, Sophie Neveu, Francois Royer, Damien Jamon, Fadi Choueikani, Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Laboratoire Hubert Curien [Saint Etienne] (LHC), Institut d'Optique Graduate School (IOGS)-Université Jean Monnet [Saint-Étienne] (UJM)-Centre National de la Recherche Scientifique (CNRS), PHysicochimie des Electrolytes et Nanosystèmes InterfaciauX (PHENIX), Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), and Université Jean Monnet [Saint-Étienne] (UJM)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)

Subjects
Materials science, Physics::Optics, General Physics and Astronomy, Nanoparticle, 02 engineering and technology, Substrate (electronics), engineering.material, 7. Clean energy, 01 natural sciences, Condensed Matter::Materials Science, symbols.namesake, Coating, 0103 physical sciences, Faraday effect, Figure of merit, Thin film, ComputingMilieux_MISCELLANEOUS, 010302 applied physics, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Birefringence, business.industry, 021001 nanoscience & nanotechnology, Magnetic anisotropy, engineering, symbols, Optoelectronics, 0210 nano-technology, business
Abstract

Composite thin films made of cobalt ferrite nanoparticles embedded in silica/zirconia sol-gel matrix are presented, and their versatility is illustrated through the impact of the nanoparticle features on the films’ final properties. The intrinsic magneto-optical potentiality of the nanoparticles is especially given by a peak around 1550 nm in the spectra of both the Faraday rotation and the magneto-optical figure of merit. These nanoparticles are inserted in the liquid preparation of a sol-gel host matrix, which is coated on a glass substrate at soft temperature. SEM and optical analysis show the absence of nanoparticle aggregates and defects into thin films and prove the ability of these films to be used as a guiding layer for photonic integration. The dispersion in the host matrix and the integration on a substrate do not affect the merit factor of the material. The specific Faraday rotation of the films is about 300 ° / cm for a volume fraction of nanoparticles of 1.5%, and it possesses a hysteresis loop. Its dependence on the nanoparticle mean size offers the possibility to achieve self-biased behavior. In addition, a magnetic field applied during the coating promotes an alignment of the magnetic easy axis of the nanoparticles along a preferential direction. It allows increasing even more the remanent magneto-optical effect and also reducing the birefringence and reaching a TE/TM phase matching of the film guided modes. It gives a way to tune these two parameters that play a crucial role in magneto-optical devices.

Published
2021

4. Photocrosslinking and photopatterning of magneto-optical nanocomposite sol-gel thin film under deep-UV irradiation

Author

C. Bidaud, Damien Jamon, Francois Royer, Dominique Berling, Sophie Neveu, Emilie Gamet, Olivier Soppera, Gestionnaire, Hal Sorbonne Université, Institut de Science des Matériaux de Mulhouse (IS2M), Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et Nanosciences Grand-Est (MNGE), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Hubert Curien [Saint Etienne] (LHC), Institut d'Optique Graduate School (IOGS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS), PHysicochimie des Electrolytes et Nanosystèmes InterfaciauX (PHENIX), Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Matériaux et nanosciences d'Alsace (FMNGE), Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA), and Université Jean Monnet [Saint-Étienne] (UJM)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)

Subjects
Materials science, Science, Radical polymerization, Nanoparticle, Nanotechnology, 02 engineering and technology, 010402 general chemistry, Methacrylate, 01 natural sciences, Article, [CHIM] Chemical Sciences, [CHIM]Chemical Sciences, Thin film, Sol-gel, Multidisciplinary, Nanocomposite, Synthesis and processing, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Photopolymer, Optical materials, Magnetic nanoparticles, Medicine, 0210 nano-technology, Materials for optics
Abstract

This paper is aimed at investigating the process of photocrosslinking under Deep-UV irradiation of nanocomposite thin films doped with cobalt ferrite magnetic nanoparticles (MNPs). This material is composed of a hybrid sol–gel matrix in which MNP can be introduced with high concentrations up to 20 vol%. Deep-UV (193 nm) is not only interesting for high-resolution patterning but we also show an efficient photopolymerization pathway even in the presence of high concentration of MNPs. In this study, we demonstrate that the photocrosslinking is based on the free radical polymerization of the methacrylate functions of the hybrid precursor. This process is initiated by Titanium-oxo clusters. The impact of the nanoparticles on the photopolymerization kinetic and photopatterning is investigated. We finally show that the photosensitive nanocomposite is suitable to obtain micropatterns with sub-micron resolution, with a simple and versatile process, which opens many opportunities for fabrication of miniaturized magneto-optical devices for photonic applications.

Published
2021

5. Bad neighbour, good neighbour: how magnetic dipole interactions between soft and hard ferrimagnetic nanoparticles affect macroscopic magnetic properties in ferrofluids

Author

Vincent Dupuis, Yohan Guyodo, Philippe Sainctavit, Véronica Gavrilov, Niéli Daffé, Jovana Zečević, Kalliopi N. Trohidou, Claire Carvallo, Dario Taverna, Nadejda Bouldi, M. Vasilakaki, Amélie Juhin, Marcin Sikora, Sophie Neveu, Fadi Choueikani, Mauro Rovezzi, Johannes D. Meeldijk, Institut de minéralogie, de physique des matériaux et de cosmochimie (IMPMC), Muséum national d'Histoire naturelle (MNHN)-Institut de recherche pour le développement [IRD] : UR206-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), PHysicochimie des Electrolytes et Nanosystèmes InterfaciauX (PHENIX), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Utrecht University [Utrecht], National Center for Scientific Research 'Demokritos' (NCSR), AGH University of Science and Technology [Krakow, PL] (AGH UST), Université Grenoble Alpes (UGA), Institut de Physique du Globe de Paris (IPGP), Institut national des sciences de l'Univers (INSU - CNRS)-IPG PARIS-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Institute of Nanoscience and Nanotechnology 'Demokritos' [Greece] (INN), Observatoire des Sciences de l'Univers de Grenoble (OSUG ), Institut national des sciences de l'Univers (INSU - CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Grenoble Alpes (UGA), FAME - Fermentation Advances and Microbial Engineering (TBI-FAME), Toulouse Biotechnology Institute (TBI), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), ANR-11-IDEX-0004,SUPER,Sorbonne Universités à Paris pour l'Enseignement et la Recherche(2011), European Project: 731976,Magenta, Minéralogie et magnétisme de basses dimensionnalités [IMPMC] (IMPMC_MIMABADI), Muséum national d'Histoire naturelle (MNHN)-Institut de recherche pour le développement [IRD] : UR206-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Muséum national d'Histoire naturelle (MNHN)-Institut de recherche pour le développement [IRD] : UR206-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Institut national des sciences de l'Univers (INSU - CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Grenoble Alpes (UGA)-Météo-France, Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-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)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Institut de Physique du Globe de Paris (IPGP (UMR_7154)), and Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)

Subjects
[PHYS]Physics [physics], Ferrofluid, Materials science, Condensed matter physics, Nanoparticle, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, Magnetic field, Physics::Fluid Dynamics, Ferrimagnetism, 0103 physical sciences, Magnetic nanoparticles, [CHIM]Chemical Sciences, General Materials Science, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], 010306 general physics, 0210 nano-technology, Spectroscopy, Nanoscopic scale, Magnetic dipole
Abstract

International audience; Fluids responding to magnetic fields (ferrofluids) offer a scene with no equivalent in nature to explore long-range magnetic dipole interactions. Here, we studied the very original class of binary ferrofluids, embedding soft and hard ferrimagnetic nanoparticles. We used a combination of x-ray magnetic spectroscopy measurements supported by multi-scale experimental techniques and Monte-Carlo simulations to unveil the origin of the emergent macroscopic magnetic properties of the binary mixture. We found that the association of soft and hard magnetic nanoparticles in the fluid has a considerable influence on their inherent magnetic properties. While the ferrofluid remains in a single phase, magnetic interactions at the nanoscale between both types of particles induce a modification of their respective coercive fields. By connecting the microscopic properties of binary ferrofluids containing small particles, our findings lay the groundwork for the manipulation of magnetic interactions between particles at the nanometer scale in magnetic liquids.

Published
2020

6. Synthesis and study of γ-Fe 2 O 3 and CoFe 2 O 4 based ferrofluids by means of spectroscopic Mueller matrix ellipsometry

Author

Damien Jamon, Enric Garcia-Caurel, M. Stchakovsky, Yann Battie, Sophie Neveu, Laboratoire de Chimie et Physique - Approche Multi-échelle des Milieux Complexes (LCP-A2MC), Université de Lorraine (UL), HORIBA France SAS [Longjumeau], HORIBA Scientific [France], PHysicochimie des Electrolytes et Nanosystèmes InterfaciauX (PHENIX), Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Hubert Curien [Saint Etienne] (LHC), Université Jean Monnet [Saint-Étienne] (UJM)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS), Laboratoire de physique des interfaces et des couches minces [Palaiseau] (LPICM), and École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Ferrofluid, Materials science, Nanoparticle, Maghemite, 02 engineering and technology, engineering.material, 01 natural sciences, 010309 optics, Ferrimagnetism, 0103 physical sciences, Materials Chemistry, Mueller calculus, Electrical and Electronic Engineering, Anisotropy, Instrumentation, ComputingMilieux_MISCELLANEOUS, [PHYS]Physics [physics], Condensed matter physics, Process Chemistry and Technology, 021001 nanoscience & nanotechnology, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Ferromagnetism, Effective medium approximations, engineering, 0210 nano-technology
Abstract

Ferrofluids are colloidal suspensions generally composed of ferromagnetic or ferrimagnetic nanoparticles (NPs). In the present study, the authors have focused on the ellipsometric characterization of two types of ferrofluids: one constituting maghemite (γ-Fe2O3) NPs and the other cobalt ferrite (CoFe2O4) NPs. The optical properties of the NPs are extracted from the ellipsometric spectra by using the Maxwell–Garnett effective medium approximations. As expected, Mueller matrix measurements reveal that the ferrofluid becomes anisotropic under the influence of a magnetic field. The authors correlate this anisotropy to the preferential orientation of NPs along the magnetic field.Ferrofluids are colloidal suspensions generally composed of ferromagnetic or ferrimagnetic nanoparticles (NPs). In the present study, the authors have focused on the ellipsometric characterization of two types of ferrofluids: one constituting maghemite (γ-Fe2O3) NPs and the other cobalt ferrite (CoFe2O4) NPs. The optical properties of the NPs are extracted from the ellipsometric spectra by using the Maxwell–Garnett effective medium approximations. As expected, Mueller matrix measurements reveal that the ferrofluid becomes anisotropic under the influence of a magnetic field. The authors correlate this anisotropy to the preferential orientation of NPs along the magnetic field.

Published
2019

7. Magnetic anisotropies and cationic distribution in CoFe2O4 nanoparticles prepared by co-precipitation route: Influence of particle size and stoichiometry

Author

Niéli Daffé, Philippe Ohresser, Amélie Juhin, Philippe Sainctavit, Marie-Anne Arrio, Vincent Dupuis, Sophie Neveu, Fadi Choueikani, Institut de minéralogie, de physique des matériaux et de cosmochimie (IMPMC), Muséum national d'Histoire naturelle (MNHN)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de recherche pour le développement [IRD] : UR206-Centre National de la Recherche Scientifique (CNRS), Synchrotron SOLEIL (SSOLEIL), 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), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de recherche pour le développement [IRD] : UR206-Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS), 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
Materials science, Absorption spectroscopy, Coprecipitation, Magnetic circular dichroism, Nanoparticle, 02 engineering and technology, Magnetic anisotropies, 010402 general chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, 0104 chemical sciences, Electronic, Optical and Magnetic Materials, Spinels, Condensed Matter::Materials Science, Physical chemistry, [CHIM]Chemical Sciences, Particle size, 0210 nano-technology, Anisotropy, Chemical composition, Stoichiometry
Abstract

International audience; Magnetic anisotropies and crystallographic structures of iron-cobalt nanospinels obtained with the co-precipitation synthesis process are revealed using X-ray Absorption Spectroscopy and X-ray Magnetic Circular Dichroism. The chemical process allows to obtain nanoparticles of various sizes and chemical composition, but it is the site symmetry environment of Co2+ that is found to be the crucial parameter that governs the magnetic anisotropies of the nanospinels. The distribution of Co2+ among the crystallographic sites of the structure is directly linked to the temperature of the synthesis process. In parallel, the results also revealed that a superficial rich shell of iron is formed for the iron-cobalt nanospinels stable in acidic medium leading to chemically inhomogeneous nanoparticles.

Published
2018

8. Can magneto-plasmonic nanohybrids efficiently combine photothermia with magnetic hyperthermia?

Author

Guillaume Radtke, Gianluigi A. Botton, Sophie Neveu, Ana Espinosa, Ali Abou-Hassan, Mathieu Bugnet, Claire Wilhelm, IMIM-Hospital del Mar, Generalitat de Catalunya, Matière et Systèmes Complexes (MSC (UMR_7057)), Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Department of Materials Science and Engineering, McMaster University, McMaster University [Hamilton, Ontario], Institut de minéralogie, de physique des matériaux et de cosmochimie (IMPMC), Institut de recherche pour le développement [IRD] : UR206-Centre National de la Recherche Scientifique (CNRS)-Muséum national d'Histoire naturelle (MNHN)-Université Pierre et Marie Curie - Paris 6 (UPMC), PHysicochimie des Electrolytes et Nanosystèmes InterfaciauX (PHENIX), Centre National de la Recherche Scientifique (CNRS)-ESPCI ParisTech-Université Pierre et Marie Curie - Paris 6 (UPMC), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de recherche pour le développement [IRD] : UR206-Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS), 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)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Matière et Systèmes Complexes (MSC), Muséum national d'Histoire naturelle (MNHN)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de recherche pour le développement [IRD] : UR206-Centre National de la Recherche Scientifique (CNRS), and 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)

Subjects
Materials science, Nanoparticle, Nanotechnology, Hyperthermia, Induced, 02 engineering and technology, Photothermal therapy, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, 3. Good health, Nanomaterials, Cancer treatment, Magnetic Fields, Magnetic hyperthermia, Heat generation, Animals, Humans, General Materials Science, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, Magnetite Nanoparticles, 0210 nano-technology, Magneto, Plasmon
Abstract

International audience; Multifunctional hybrid-design nanomaterials appear to be a promising route to meet the current therapeutics needs required for efficient cancer treatment. Herein, two efficient heat nano-generators were combined into a multifunctional single nanohybrid (a multi-core iron oxide nanoparticle optimized for magnetic hyperthermia, and a gold branched shell with tunable plasmonic properties in the NIR region, for photothermal therapy) which impressively enhanced heat generation, in suspension or in vivo in tumours, opening up exciting new therapeutic perspectives.s.

Published
2015

9. Preparation of Highly Anisotropic Cobalt Ferrite/Silica Microellipsoids Using an External Magnetic Field

Author

David Montero, Patricia Beaunier, Sébastien Abramson, Vincent Dupuis, Sophie Neveu, Physicochimie des Electrolytes, Colloïdes et Sciences Analytiques (PECSA), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-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)-Université Pierre et Marie Curie - Paris 6 (UPMC), 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)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Laboratoire de Réactivité de Surface (LRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and 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)

Subjects
Nanostructure, Materials science, Magnetic moment, Physics::Optics, Nanoparticle, 02 engineering and technology, Surfaces and Interfaces, 010402 general chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, 0104 chemical sciences, Magnetic field, Dipole, Magnetic anisotropy, Nuclear magnetic resonance, Chemical engineering, Electrochemistry, [CHIM]Chemical Sciences, Magnetic nanoparticles, General Materials Science, 0210 nano-technology, Anisotropy, Spectroscopy
Abstract

International audience; Magnetic cobalt ferrite/silica microparticles having both an original morphology and an anisotropic nanostructure are synthesized through the use of an external magnetic field and nanoparticles characterized by a high magnetic anisotropy. The association of these two factors implies that the ESE (emulsion and solvent evaporation) sol-gel method employed here allows the preparation of silica microellipsoids containing magnetic nanoparticles aggregated in large chains. It is clearly shown that without this combination, microspheres characterized by an isotropic distribution of the magnetic nanoparticles are obtained. While the chaining of the cobalt ferrite nanoparticles inside the silica matrix is related to the increase of their magnetic dipolar interactions, the ellipsoidal shape of the microparticles may be explained by the elongation of the sol droplets in the direction of the external magnetic field during the synthesis. Because of their highly anisotropic structure, these microparticles exhibit permanent magnetic moments, which are responsible, at a larger scale, for the existence of strong magnetic dipolar interactions. Therefore, when they are dispersed in water, the microellipsoids self-assemble into large and irregular chains. These interactions can be reinforced by the use of external magnetic field, allowing the preparation of very large permanent chains. This research illustrates how nanostructured particles exhibiting complex architectures can be elaborated through simple, fast, and low-cost methods, such as the use of external fields in combination with soft chemistry.

Published
2014

10. Nanoscale distribution of magnetic anisotropies in bimagnetic soft core-hard shell MnFe$_2$O$_4$@CoFe$_2$O$_4$ nanoparticles

Author

Philippe Sainctavit, Niéli Daffé, Sophie Neveu, Marcin Sikora, Nadejda Bouldi, Véronica Gavrilov, Amélie Juhin, Dario Taverna, Fadi Choueikani, Vincent Dupuis, Mauro Rovezzi, Philippe Ohresser, Marie-Anne Arrio, Alexandre Gloter, Institut de minéralogie, de physique des matériaux et de cosmochimie (IMPMC), Muséum national d'Histoire naturelle (MNHN)-Institut de recherche pour le développement [IRD] : UR206-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Sorbonne Université (SU), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), AGH University of Science and Technology [Krakow, PL] (AGH UST), European Synchrotron Radiation Facility (ESRF), Dispositifs et Instrumentation en Optoélectronique et micro-ondes (DIOM), Université Jean Monnet [Saint-Étienne] (UJM), Laboratoire de Physique des Solides (LPS), and Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Materials science, RIXS, XAS, Nanoparticle, FOS: Physical sciences, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, Magnetization, RIXS‐MCD, [CHIM]Chemical Sciences, core–shell nanoparticles, Anisotropy, Saturation (magnetic), Nanoscopic scale, magnetic anisotropy, Condensed Matter - Materials Science, Condensed matter physics, XMCD, Mechanical Engineering, Inner core, Materials Science (cond-mat.mtrl-sci), [CHIM.MATE]Chemical Sciences/Material chemistry, Coercivity, spinel ferrites, 021001 nanoscience & nanotechnology, 3. Good health, 0104 chemical sciences, Magnetic anisotropy, Mechanics of Materials, 0210 nano-technology
Abstract

The nanoscale distribution of magnetic anisotropies was measured in core@shell MnFe$_2$O$_4$@CoFe$_2$O$_4$ 7.0 nm particles using a combination of element selective magnetic spectroscopies with different probing depths. As this picture is not accessible by any other technique, emergent magnetic properties were revealed. The coercive field is not constant in a whole nanospinel. The very thin (0.5 nm) CoFe$_2$O$_4$ hard shell imposes a strong magnetic anisotropy to the otherwise very soft MnFe$_2$O$_4$ core: a large gradient in coercivity was measured inside the MnFe$_2$O$_4$ core with lower values close to the interface region, while the inner core presents a substantial coercive field (0.54 T) and a very high remnant magnetization (90% of the magnetization at saturation)., Comment: 27 pages (including supporting information)

Published
2016
Full Text
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11. Mercury-based cobalt magnetic fluids and cobalt nanoparticles

Author

Valérie Cabuil, Sophie Neveu, R. Massart, B. Rasolonjatovo, Liquides Ioniques et Interfaces Chargées (LI2C), 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)-Centre National de la Recherche Scientifique (CNRS), and Cabuil, Valérie

Subjects
inorganic chemicals, MERCURE, Ferrofluid, Materials science, Inorganic chemistry, chemistry.chemical_element, Nanoparticle, One-Step, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, Nuclear magnetic resonance, Pulmonary surfactant, ComputingMilieux_MISCELLANEOUS, [CHIM.MATE] Chemical Sciences/Material chemistry, [CHIM.MATE]Chemical Sciences/Material chemistry, equipment and supplies, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 0104 chemical sciences, Electronic, Optical and Magnetic Materials, Mercury (element), chemistry, Magnetic nanoparticles, 0210 nano-technology, human activities, Cobalt
Abstract

This paper describes the synthesis of a magnetic and conducting liquid consisting of cobalt nanoparticles dispersed in mercury. The magnetic nanoparticles are obtained in one step by the electroreduction of a cobalt(II) solution on mercury. These particles are then extracted using an organic solution of surfactant in order to obtain a ferrofluid based on cobalt nanoparticles.

Published
2007

12. Synthesis of Trimagnetic Multishell MnFe2O4@CoFe2O4@NiFe2O4 Nanoparticles

Author

Valérie Cabuil, Vincent Dupuis, Alexandre Gloter, Véronica Gavrilov-Isaac, Dario Taverna, Sophie Neveu, 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)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Institut de minéralogie et de physique des milieux condensés (IMPMC), Université Pierre et Marie Curie - Paris 6 (UPMC)-IPG PARIS-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), 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), and Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, Nanoparticle, 02 engineering and technology, General Chemistry, Manganese ferrite, Coercivity, [CHIM.INOR]Chemical Sciences/Inorganic chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, Biomaterials, Soft core, Cobalt ferrite, Ferrite (magnet), Magnetic nanoparticles, [CHIM]Chemical Sciences, General Materials Science, Composite material, 0210 nano-technology, Nickel ferrite, ComputingMilieux_MISCELLANEOUS, Biotechnology
Abstract

The synthesis and characterization of original ferrite multishell magnetic nanoparticles made of a soft core (manganese ferrite) covered with two successive shells, a hard one (cobalt ferrite) and then a soft one (nickel ferrite), are described. The results demonstrate the modulation of the coercivity when new magnetic shells are added.

Published
2014

13. Self-biased cobalt ferrite nanocomposites for microwave applications

Author

Sophie Neveu, Faouzi Kahlouche, Ardaches Tchangoulian, Didier Vincent, A. Hannour, Vincent Dupuis, Laboratoire Telecom Claude Chappe (LT2C), Université Jean Monnet [Saint-Étienne] (UJM)-Ecole d'ingenieurs Telecom Saint Etienne, Laboratoire Hubert Curien [Saint Etienne] (LHC), Institut d'Optique Graduate School (IOGS)-Université Jean Monnet [Saint-Étienne] (UJM)-Centre National de la Recherche Scientifique (CNRS), Liquides Ioniques et Interfaces Chargées (LI2C), 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)-Centre National de la Recherche Scientifique (CNRS), Université Jean Monnet - Saint-Étienne (UJM)-Ecole d'ingénieurs Télécom Saint-Etienne (TSE), Laboratoire Hubert Curien (LHC), and Institut d'Optique Graduate School (IOGS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, Nanocomposite, HFSS, Circulator, Nanoparticle, Condensed Matter Physics, 7. Clean energy, Ferromagnetic resonance, Electronic, Optical and Magnetic Materials, [SPI.TRON]Engineering Sciences [physics]/Electronics, Magnetic anisotropy, [SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, Nuclear magnetic resonance, Remanence, Composite material, Microwave, ComputingMilieux_MISCELLANEOUS
Abstract

Oriented CoFe2O4 nanoparticles, dispersed in polymethyl methacrylate (PMMA) matrix, were fabricated by magnetophoretic deposition of functionalized nanocolloidal cobalt ferrite particles into porous alumina membrane. Their magnetic behavior exhibits an out-of-plane easy axis with a large remanent magnetization and coercitivity. This orientation allows high effective internal magnetic anisotropy that contributes to the permanent bias along the wire axis. The microwave studies reveal a ferromagnetic resonance at 46.5 and 49.5 GHz, depending on the filling ratio of the membrane. Ansoft High Frequency Structure Simulator (Ansoft HFSS) simulations are in good agreement with experimental results. Such nanocomposite is presented as one of the promising candidates for microwave devices (circulators, isolators, noise suppressors etc.).

Published
2014

14. Synthesis And Properties Of Magnetic Nanoparticles With Tunable Magnetic Anisotropy Energy

Author

Vincent Dupuis, Sophie Neveu, Véronica Gavrilov-Isaac, Sébastien Abramson, and Merwen Aouadi

Subjects
Magnetization, Magnetic anisotropy, Paramagnetism, Materials science, Anisotropy energy, Condensed matter physics, Nanoparticle, Magnetic nanoparticles, Coercivity, Magnetic susceptibility
Abstract

In this paper, we discuss several strategies to tailor magnetic properties related to the magnetic anisotropy energy, such as the blocking temperature or the low temperature coercivity, of magnetic nanoparticles or materials made with magnetic nanoparticles. We describe a first approach that consists in synthesizing and dispersing bi and tri-magnetic core-shell nanoparticles that include a core made of a material with a weak anisotropy energy density and a shell made with a material with a large anisotropy energy density. This approach is a promising route to tune the blocking temperature of low temperature coercivity of a particle without altering its magnetization and with a good control of its size. Additionally, we also explore another route for the control of the shape of the hysteresis loop of material made with magnetic nanoparticles that consists in the simple mixture of magnetically soft and hard magnetic nanoparticles to create binary mixtures. In this case, it is the mixing ratio that allows one to adjust the properties of the final material.

Published
2014

15. Synthesis of goethite by separation of the nucleation and growth processesof ferrihydrite nanoparticles using microfluidics

Author

Olivier Sandre, Valérie Cabuil, Ali Abou-Hassan, Sophie Neveu, Physicochimie des Electrolytes, Colloïdes et Sciences Analytiques (PECSA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), and 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)

Subjects
Goethite, Chemistry, Inorganic chemistry, Microfluidics, Nucleation, Nanoparticle, General Medicine, [CHIM.MATE]Chemical Sciences/Material chemistry, 02 engineering and technology, General Chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Catalysis, 0104 chemical sciences, Ferrihydrite, Chemical engineering, visual_art, visual_art.visual_art_medium, Microreactor, 0210 nano-technology, [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft]
Abstract

Eine mikrofluidische Synthese von Nanopartikeln nutzt getrennte Keimbildungs- und Wachstumsphasen in zwei Mikroreaktoren, die bei unterschiedlichen Temperaturen und Flussbedingungen arbeiten (siehe Bild). Ferrihydrit-Nanopartikel werden im ersten Mikroreaktor abgeschieden und in einem Mikrostromungsrohr unter kontinuierlichem Fluss gealtert, wodurch Goethit-Nanopartikel resultieren. TMAOH=Tetramethylammoniumhydroxid.

Published
2009
Full Text
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16. Multicolor Emission of Small Molecule-Based Amorphous Thin Films and Nanoparticles with a Single Excitation Wavelength

Author

Patric Tauc, Arnaud Brosseau, Céline Fiorini-Debuisschert, Anne Léaustic, Gilles Clavier, Olivier Sandre, Eléna Ishow, Sophie Neveu, Keitaro Nakatani, Laboratoire de Photophysique et Photochimie Supramoléculaires et Macromoléculaires (PPSM), École normale supérieure - Cachan (ENS Cachan)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Biologie et de Pharmacologie Appliquée (LBPA), École normale supérieure - Cachan (ENS Cachan)-Centre National de la Recherche Scientifique (CNRS), Département de Recherche sur l'Etat Condensé, les Atomes et les Molécules (DRECAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Physicochimie des Electrolytes, Colloïdes et Sciences Analytiques (PECSA), 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 inorganique (LCI), and Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Materials science, business.industry, General Chemical Engineering, Nanoparticle, 02 engineering and technology, General Chemistry, [CHIM.MATE]Chemical Sciences/Material chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, Single excitation, 01 natural sciences, Small molecule, 0104 chemical sciences, Amorphous solid, Wavelength, Optics, Intramolecular force, Materials Chemistry, Optoelectronics, Thin film, 0210 nano-technology, business, Excitation
Abstract

International audience; Fluorescent organic nanoparticles (FON) made of small molecules recently arouse considerable interest in biomedical imaging and opto-electronics as potential microlasers or emitting displays.2 Their collective emission largely enhanced with respect to dilute media and their reduced sensitivity to external bleaching and quenching effects make them very attractive when powerful excitation is required as in multiphoton fluorescence spectroscopy. Fluorescence in the solid state is however facing two deleterious effects: competitive non-radiative quenching processes caused by strong intermolecular aggregation, and emission reabsorption owing to the inherent high chromophore density. The main strategies consist in introducing bulky substituents to prevent the formation of non-emissive π−π stacked assemblies as well as elaborating materials with a large optical Stokes shift. Hydrophobic materials are often obtained and considered of little use in bioimaging. We want to report herein the synthesis and the properties of a new family of push-pull amorphous compounds which form strong one-and two-photon emitting nanoparticles that can efficiently be utilized to image lipophilic cell membranes despite their water insolubility.The present series of fluorescent compounds consists in polar triphenylamino derivatives substituted by bulky tert-butylphenyl groups following a Suzuki aromatic cross coupling reaction as a final step. Both the twisted star-shaped triphenylamino-core and peripheral hindered substituents prevent deleterious π−π stacking and ensure high solubility in polar and apolar organic solvents.

Published
2008

17. Ferrofluids from Prism-Like Nanoparticles

Author

Valérie Cabuil, Y. Ramaye, Sophie Neveu, Cabuil, Valérie, Liquides Ioniques et Interfaces Chargées (LI2C), Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Ferrofluid, [CHIM.MATE] Chemical Sciences/Material chemistry, Materials science, Cyclohexane, Small-angle X-ray scattering, Dispersity, Nanoparticle, 02 engineering and technology, [CHIM.MATE]Chemical Sciences/Material chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, 3. Good health, 0104 chemical sciences, Electronic, Optical and Magnetic Materials, Iron pentacarbonyl, chemistry.chemical_compound, Nuclear magnetic resonance, chemistry, Chemical engineering, Magnetic nanoparticles, Prism, 0210 nano-technology, ComputingMilieux_MISCELLANEOUS
Abstract

Decomposition of iron pentacarbonyl in kerosene in the presence of octanoic acid and bis-2-ethylhexylamine leads to very monodisperse iron nanoparticles and thus to monodisperse magnetic nanoparticles. These latter can be spherical or appear as triangles on MET pictures. SAXS and AFM indicate that particles are more likely prisms. They can be dispersed in cyclohexane to produce ferrofluids.

Published
2005

18. Supramolecular assemblies of gold nanoparticles induced by hydrogen bond interactions

Author

Sophie Neveu, Valérie Cabuil, Cédric R. Mayer, Francis Sécheresse, Liquides Ioniques et Interfaces Chargées (LI2C), 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)-Centre National de la Recherche Scientifique (CNRS), Institut Lavoisier de Versailles (ILV), and Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Hydrogen, Inorganic chemistry, Supramolecular chemistry, chemistry.chemical_element, Nanoparticle, 02 engineering and technology, [CHIM.INOR]Chemical Sciences/Inorganic chemistry, 010402 general chemistry, 01 natural sciences, Biomaterials, Colloid, Colloid and Surface Chemistry, ComputingMilieux_MISCELLANEOUS, Hydrogen bond, Ligand, self assembly, 021001 nanoscience & nanotechnology, hydrogen bonding, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, chemistry, Chemical engineering, Colloidal gold, gold nanoparticles, Self-assembly, 0210 nano-technology
Abstract

The formation of two-dimensional self-assemblies of ordered, packed gold nanoparticles is described. The nanoparticles were coated by a diamide thiol ligand (DASH) that ensured the connection of the nanoparticles through hydrogen bonds. The stability of the colloidal solutions is discussed with respect to the stability of the normal dodecanethiol-coated particles.

Published
2004

19. Magneto-optical properties of CoFe2O4 ferrofluids : Influence of the nanoparticles size distribution

Author

Francois Royer, Sophie Neveu, D. Zins, Damien Jamon, Jean Jacques Rousseau, Valérie Cabuil, H. Roux, Dispositifs et Instrumentation en Optoélectronique et micro-ondes (DIOM), Université Jean Monnet [Saint-Étienne] (UJM), Liquides Ioniques et Interfaces Chargées (LI2C), 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)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique de la Matière Condensée et Nanostructures (LPMCN), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon, Université Jean Monnet - Saint-Étienne (UJM), Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS]Physics [physics], Ferrofluid, Materials science, Condensed matter physics, Nanoparticle, Transmittance spectrum, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, Magneto optical, Particles size sorting, symbols.namesake, Ellipsometry, Faraday effect, symbols, Sample preparation, Magneto-optical effects, Small particles, 0210 nano-technology, ComputingMilieux_MISCELLANEOUS, Transmittance spectra
Abstract

This paper reports an experimental investigation on size-sorted cobalt ferrite (CoFe2O4) ferrofluids. The sample preparation and the size-sorting process are exposed. Faraday rotation measurements, performed with a null ellipsometer, and transmittance spectra are discussed using the size of the nanoparticles and the Co-to-Fe ratio. Comparison with the properties of γ-Fe2O3 particles is made. Finally the study shows that the ferrofluid factor of merit is enhanced by small particles.

Published
2004

20. Nanocomposite systems based on gold nanoparticles and thiometalates. From colloids to networks

Author

Sophie Neveu, Corine Simonnet-Jégat, Cédric R. Mayer, Catherine Debiemme-Chouvy, Francis Sécheresse, Valérie Cabuil, Liquides Ioniques et Interfaces Chargées (LI2C), 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)-Centre National de la Recherche Scientifique (CNRS), Institut Lavoisier de Versailles (ILV), and Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nanocomposite, Materials science, Scanning electron microscope, Mineralogy, Nanoparticle, 02 engineering and technology, General Chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, Colloid, Chemical engineering, X-ray photoelectron spectroscopy, Colloidal gold, Transmission electron microscopy, Materials Chemistry, 0210 nano-technology, Spectroscopy, ComputingMilieux_MISCELLANEOUS
Abstract

A new nanocomposite system based on gold nanoparticles and thiometalates is described. According to the metalate species, WS42¬ or WS2O22¬, and to the experimental conditions, two sizes of particles are obtained (d = 2 or 5 nm). These particles lead either to stable colloidal solutions or irreversible micrometric spherical aggregates of nanoparticles cemented by WS42¬. Energy dispersive spectrometry (EDS), transmission electron microscopy (TEM), scanning electron microscopy (SEM), UV-vis spectroscopy and X-ray photoelectron spectroscopy (XPS) have been used to fully characterize the different composite systems.

Published
2002

21. Size-selective chemical chemical synthesis of tartrate stabilized cobalt ferrite ionic magnetic fluid

Author

Delphine Talbot, Sophie Neveu, Agnes Bee, Michel Robineau, Liquides Ioniques et Interfaces Chargées (LI2C), Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Ferrofluid, Inorganic chemistry, magnetic fluid, Nanoparticle, Ionic bonding, 02 engineering and technology, Tartrate, [CHIM.INOR]Chemical Sciences/Inorganic chemistry, 010402 general chemistry, 01 natural sciences, Ion, Physics::Fluid Dynamics, Biomaterials, chemistry.chemical_compound, Colloid and Surface Chemistry, cobalt ferrite, ComputingMilieux_MISCELLANEOUS, [CHIM.MATE]Chemical Sciences/Material chemistry, equipment and supplies, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, control of size, chemistry, adsorption, Ferrite (magnet), Magnetic nanoparticles, nanoparticles, Particle size, 0210 nano-technology, human activities
Abstract

Ionic magnetic fluid (ferrofluid) is a stable suspension of magnetic nanoparticles in water. Cobalt ferrite nanoparticles are interesting in view of high-density recording storage. The size of the magnetic particles strongly influences the physical properties of the ferrofluids. In this study, we describe the synthesis of ionic magnetic fluid in the presence of tartrate ions. By varying the amount of organic ligands, nanoparticles in a large range of size are obtained: the mean diameter varies from 3 to 10 nm. The effect of tartrate ions on the stability of the ionic magnetic fluid is also studied in relation with the size of the magnetic particles and the amount of adsorbed ligand.

Published
2002

22. Synthesis of cobalt ferrite nanoparticles in continuous-flow microreactors

Author

Vincent Dupuis, Sophie Neveu, Valérie Cabuil, and Ali Abou-Hassan

Subjects
Materials science, Chemical engineering, Continuous flow, General Chemical Engineering, Reagent, Nanoparticle, Cobalt ferrite nanoparticles, Nanotechnology, General Chemistry, Microreactor, Homogenization (chemistry), Amorphous solid
Abstract

High quality CoFe2O4 nanoparticles were synthesized only in 16 min, continuously in two coupled microreactors. The first microreactor induced the fast homogenization of the reagents mixture at ambient temperature so Fe3+ and Co2+ hydroxides precipitate, while a second microreactor heated at 98 °C allowed the fast aging and the evolution of amorphous hydroxides into faceted and crystalline CoFe2O4.

Published
2012

23. Different localizations of hydrophobic magnetic nanoparticles within vesicles trigger their efficiency as magnetic nano-heaters

Author

Sophie Neveu, Grégory Beaune, Claire Wilhelm, Michael Levy, Florence Gazeau, and Christine Ménager

Subjects
Liposome, Relaxometry, Membrane, Materials science, Chemical engineering, Transmission electron microscopy, Vesicle, Inner core, Magnetic nanoparticles, Nanoparticle, Nanotechnology, General Chemistry, Condensed Matter Physics
Abstract

The reverse phase evaporation (REV) and the multiple emulsion (ME) process are used to encapsulate hydrophobic magnetic nanoparticles (MNPs) within vesicles. The effect of the size distribution of the nanoparticles on their location in the liposomes has been observed by transmission electron microscopy: the small ones are in the inner core of the vesicles while the larger ones are found to be located at the membrane level. The influence of the confinement of hydrophobic nanoparticles inside vesicles on their subsequent magnetic properties (relaxometry, heating capacity) has been studied.

Published
2011

24. Magneto-optical waveguides made of cobalt ferrite nanoparticles embedded in silica/zirconia organic-inorganic matrix

Author

Damien Jamon, Sophie Neveu, A. Siblini, Jamal Charara, Francois Royer, Fadi Choueikani, Jean Jacques Rousseau, Dispositifs et Instrumentation en Optoélectronique et micro-ondes (DIOM), Université Jean Monnet [Saint-Étienne] (UJM), Laboratoire Hubert Curien [Saint Etienne] (LHC), Institut d'Optique Graduate School (IOGS)-Université Jean Monnet [Saint-Étienne] (UJM)-Centre National de la Recherche Scientifique (CNRS), Liquides Ioniques et Interfaces Chargées (LI2C), 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)-Centre National de la Recherche Scientifique (CNRS), Département de Physique, Faculté des sciences I, Université Libanaise, Université Jean Monnet - Saint-Étienne (UJM), Laboratoire Hubert Curien (LHC), and Institut d'Optique Graduate School (IOGS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
010302 applied physics, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Birefringence, Materials science, Physics and Astronomy (miscellaneous), business.industry, Annealing (metallurgy), Nanoparticle, 01 natural sciences, 010309 optics, symbols.namesake, Optics, Ellipsometry, 0103 physical sciences, Faraday effect, symbols, Optoelectronics, Magnetic nanoparticles, Cubic zirconia, business, Refractive index
Abstract

International audience; This paper describes a way to develop magneto-optical waveguides via sol-gel process. They are made of cobalt ferrite nanoparticles embedded in a silica/zirconia matrix. Thin films are coated on glass substrate using the dip-coating technique. Annealing and UV treatment are applied to finalize samples preparation. Therefore, planar waveguides combining magneto-optical properties with a low refractive index (~ 1, 5) are obtained. M-lines and free space ellipsometry measurements show a specific Faraday rotation of 250 °/cm and a modal birefringence of 1.10−4, at 820 nm. Thus, the mode conversion efficiency can reach a maximum value around 56 %.

Published
2009

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