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27 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. Deep‐UV Lithography of Nanocomposite Thin Films into Magnetooptical Gratings with Submicron Periodicity

Author

Francois Royer, Dominique Berling, Damien Jamon, Sophie Neveu, Olivier Soppera, Loïc Vidal, Clémentine Bidaud, Emilie Gamet, Institut de Science des Matériaux de Mulhouse (IS2M), 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), 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), Institut de Chimie des Sufaces et Interfaces (ICSI), 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)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), 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), Institut d'Optique Graduate School (IOGS)-Université Jean Monnet - Saint-Étienne (UJM)-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 Jamon, Damien

Subjects
Materials science, 02 engineering and technology, 01 natural sciences, [PHYS] Physics [physics], Analytical Chemistry, law.invention, symbols.namesake, law, [CHIM] Chemical Sciences, 0103 physical sciences, Faraday effect, [CHIM]Chemical Sciences, Physical and Theoretical Chemistry, Lithography, ComputingMilieux_MISCELLANEOUS, [PHYS]Physics [physics], 010302 applied physics, Nanocomposite, business.industry, Organic Chemistry, Nanocomposite thin films, 021001 nanoscience & nanotechnology, symbols, Optoelectronics, Photolithography, 0210 nano-technology, business
Abstract

International audience

Published
2020

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. Enhanced magneto-optical response with a 1D resonant grating for sensing applications

Author

Laure Bsawmaii, François Royer, Sophie Neveu, Emilie Gamet, Damien Jamon, 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 Telecom Claude Chappe (LT2C), Université Jean Monnet [Saint-Étienne] (UJM)-Ecole d'ingenieurs Telecom Saint Etienne, 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), 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
[PHYS]Physics [physics], Waveguide (electromagnetism), Materials science, Sensing applications, business.industry, Physics::Optics, 02 engineering and technology, Dielectric, Grating, 021001 nanoscience & nanotechnology, 01 natural sciences, Magneto optical, Magnetic field, 010309 optics, High transmission, 0103 physical sciences, Optoelectronics, Physics::Atomic Physics, 0210 nano-technology, business, ComputingMilieux_MISCELLANEOUS
Abstract

Significant enhancement of the longitudinal magneto-optical effect accompanied with high transmission was demonstrated by experimental measurements and confirmed by numerical simulations for small angles of incidence. The work was led with a subwavelength resonant structure consisting of a 1D dielectric grating structured on top of a magneto-optical waveguide. The simplicity of the fabricated structure associated to the significant achieved magneto-optical effect, make the structure a promising tool for applications like magnetic field sensors or in non-destructive testing.

Published
2020

5. Longitudinal magneto-optical effect enhancement with high transmission through a 1D all-dielectric resonant guided mode grating

Author

Sophie Neveu, Emilie Gamet, Francois Royer, Damien Jamon, Laure Bsawmaii, 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
[PHYS]Physics [physics], Materials science, business.industry, Guided-mode resonance, Physics::Optics, 02 engineering and technology, Dielectric, Grating, 021001 nanoscience & nanotechnology, Polarization (waves), 01 natural sciences, Surface plasmon polariton, Atomic and Molecular Physics, and Optics, Magneto optical, Magnetic field, 010309 optics, Optics, 0103 physical sciences, Transmittance, 0210 nano-technology, business, ComputingMilieux_MISCELLANEOUS
Abstract

A significant enhancement of the longitudinal magneto-optical effect is demonstrated numerically and experimentally in transmission, and for small angles of incidence, through a subwavelength resonant structure consisting of a dielectric grating on top of a magneto-optical waveguide. The enhanced polarization rotation is associated with a high transmittance. These low footprint devices may thus be suitable for applications like magnetic field sensors or in non-destructive testing.

Published
2020

6. Micro-structured optical fiber functionalization with magnetic nanoparticles doped sol-gel matrix: application to an all-fiber magnetic field sensor

Author

Sylvain Girard, Frédéric Royer, A. Dufour, L. Bsawmaii, Sophie Neveu, Emmanuel Marin, Stéphanie Reynaud, Damien Jamon, 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
Optical fiber, Materials science, Physics::Optics, 02 engineering and technology, engineering.material, 01 natural sciences, law.invention, 010309 optics, Condensed Matter::Materials Science, symbols.namesake, Coating, law, 0103 physical sciences, Faraday effect, Fiber, Thin film, ComputingMilieux_MISCELLANEOUS, [PHYS]Physics [physics], business.industry, 021001 nanoscience & nanotechnology, Condensed Matter::Soft Condensed Matter, Core (optical fiber), engineering, symbols, Optoelectronics, Surface modification, Magnetic nanoparticles, 0210 nano-technology, business
Abstract

The functionalization of micro-structured optical fibers can bring new applications for conventional fibers. We present a magneto-optic sensor based on the Faraday effect, through magnetic nanoparticles doped sol-gel thin film coating the fiber core.

Published
2020

7. Enhancement of Both Faraday and Kerr Effects with an All-Dielectric Grating Based on a Magneto-Optical Nanocomposite Material

Author

Yves Jourlin, Damien Jamon, Emilie Gamet, Sophie Neveu, Francois Royer, Bobin Varghese, 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, General Chemical Engineering, Physics::Optics, 02 engineering and technology, Dielectric, Grating, 01 natural sciences, Article, law.invention, 010309 optics, symbols.namesake, law, 0103 physical sciences, Faraday effect, Faraday cage, QD1-999, ComputingMilieux_MISCELLANEOUS, Photonic crystal, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], business.industry, General Chemistry, 021001 nanoscience & nanotechnology, Polarization (waves), Magnetic field, Chemistry, symbols, Optoelectronics, 0210 nano-technology, business, Excitation
Abstract

We report on the design, fabrication, and characterization of an all-dielectric one-dimensional (1D) resonant device formed by a silicon nitride grating impregnated by a low-index magneto-optical silica-type matrix. This impregnation is realized through the dipping of the 966 nm periodic template in a sol–gel solution previously doped with CoFe2O4 nanoparticles, and able to fill the grating slits. By a proper adjustment of the geometrical parameters of such a photonic crystal membrane, simultaneous excitation of transverse electric (TE) and transverse magnetic (TM) polarization resonances is nearly achieved at 1570 nm. This TE/TM phase-matching situation leads to a fivefold enhancement of the Faraday effect in the resonance area with an increased merit factor of 0.32°. Moreover, the device demonstrates its ability to enhance longitudinal and transverse Kerr effects for the other directions of the applied magnetic field. Taking benefits from the ability of the nanocomposite material to be processed on photonic platforms, and despite its quite low magneto-optical activity compared to classical magnetic materials, this work proves that an all-dielectric 1D device can produce a high magneto-optical sensitivity to every magnetic field directions.

Published
2019

8. 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

9. Magneto-optical Faraday effect in suspended core micro-structured optical fiber filled with magnetic CoFe2O4 nanoparticles doped composite material

Author

Frédéric Royer, Emmanuel Marin, Marie-Françoise Blanc-Mignon, Damien Jamon, Sophie Neveu, 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), 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 d'Optique Graduate School (IOGS)-Université Jean Monnet [Saint-Étienne] (UJM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Hubert Curien (LHC), Institut d'Optique Graduate School (IOGS)-Université Jean Monnet - Saint-Étienne (UJM)-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
Optical fiber, Materials science, Optical isolator, Physics::Optics, 02 engineering and technology, 01 natural sciences, law.invention, symbols.namesake, law, 0103 physical sciences, Faraday effect, Fiber, Electrical and Electronic Engineering, Composite material, ComputingMilieux_MISCELLANEOUS, 010302 applied physics, Microstructured optical fiber, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Core (optical fiber), Hardware and Architecture, symbols, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, Magnetic nanoparticles, 0210 nano-technology, Hard-clad silica optical fiber
Abstract

This paper deals with the study of the magneto-optical Faraday effect of micro-structured optical fibers with suspended cores covered by a silica matrix doped by CoFe2O4 nanoparticles. Two different size distributions of nanoparticles originated from two magnetic fluids have been used to dope a sol-gel preparation later introduced in the fiber. Faraday rotation measurements were performed in liquid state, thin film and finally in the fiber in guided configuration. The two different magnetic behaviors of these nanoparticles collections allow us to evidence the Faraday effect of the micro-structured optical fiber.

Published
2017

10. 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

11. Rheological investigations on the theoretical predicted 'Poisoning' effect in bidisperse ferrofluids

Author

Sophie Neveu, E. Siebert, Vincent Dupuis, Stefan Odenbach, 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), 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
Ferrofluid, Materials science, Economies of agglomeration, Rheometer, Thermodynamics, Context (language use), 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, 0104 chemical sciences, Electronic, Optical and Magnetic Materials, Magnetic field, Condensed Matter::Soft Condensed Matter, Physics::Fluid Dynamics, Nuclear magnetic resonance, Rheology, Particle-size distribution, [CHIM]Chemical Sciences, Small particles, 0210 nano-technology, ComputingMilieux_MISCELLANEOUS
Abstract

Interparticle interactions in ferrofluids especially the influence of small particles on the agglomeration behaviour of large particles were the topic of numerous theoretical predictions and simulations as well as of experimental investigations. In this context the “Poisoning” effect describes the decrease of the magnetoviscous effect in the presence of small particles in a bidisperse model fluid. In order to examine this effect rheological experiments have been carried out by means of a specially designed rheometer, which allows measurements under the influence of an applied magnetic field. We were able to synthesize ferrofluids with a narrow particle size distribution containing only small or large cobalt ferrite nanoparticles, which were mixed to receive various bidisperse fluid samples. With these fluids changes of the viscous behaviour in a magnetic field have been measured and compared according to their individual compositions.

Published
2015

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. Surface waves in ferrofluids under vertical magnetic field

Author

Sophie Neveu, Julien Browaeys, Jean-Claude Bacri, C. Flament, Régine Perzynski, Laboratoire des Milieux Désordonnés et Hétérogènes (LMDH), Université Pierre et Marie Curie - Paris 6 (UPMC)-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), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Ferrofluid, Condensed matter physics, Mechanics, Condensed Matter Physics, 01 natural sciences, 010305 fluids & plasmas, Electronic, Optical and Magnetic Materials, Magnetic field, Surface wave, Inviscid flow, Free surface, Dispersion relation, 0103 physical sciences, Shadowgraph, 010306 general physics, Critical field, ComputingMilieux_MISCELLANEOUS
Abstract

We present here new experimental results about the waves at the horizontal free surface of a magnetic fluid submitted to a normal magnetic field. The waves are generated by a small modulation at frequency of the vertical field . Using a shadowgraph method, we are able to measure the wavevector k of the 2D waves for a given value of and . The dispersion relation of the surface waves is established experimentally. On the other hand, we propose a theoretical derivation of the dispersion equation which includes a more complete treatment of the magnetic term than the previous works. Finally, we conclude that a linear and inviscid analysis is sufficient to fit well the experimental data, except in the vicinity of the critical field where a surface instability occurs.

Published
1999

15. Monodisperse magnetic nanoparticles: Preparation and dispersion in water and oils

Author

Emmanuelle Dubois, R. Massart, Sandrine Lefebure, Sophie Neveu, 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), and Neveu, Sophie

Subjects
Phase transition, Materials science, Dispersity, Maghemite, 02 engineering and technology, engineering.material, 010402 general chemistry, 01 natural sciences, law.invention, Magazine, law, General Materials Science, ComputingMilieux_MISCELLANEOUS, [CHIM.MATE] Chemical Sciences/Material chemistry, Range (particle radiation), Aqueous solution, Mechanical Engineering, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 0104 chemical sciences, Chemical engineering, Mechanics of Materials, engineering, Magnetic nanoparticles, 0210 nano-technology, Dispersion (chemistry)
Abstract

Nanometric maghemite and cobalt ferrite particles are chemically synthesized. The process produces particles polydisperse in size. The positive charges of their surface allow one to disperse them in aqueous acidic solutions and to obtain dispersions stabilized through electrostatic repulsions. Increasing acid concentration (in the range 0.1 to 0.5 mol.L−1), interparticles repulsions are screened and phase transitions are induced. Using this phenomenon, we describe a two-step size sorting process, in order to get significant amounts of nanometric monosized particles (with diameters monitored between typically 6 and 13 nm). As the surface of the latter is not modified by the size sorting process, usual procedures are used to disperse them in several aqueous or oily media.

Published
1998

16. The magnetic fluid for heat transfer applications

Author

Sophie Neveu, Katsuto Nakatsuka, H. Koganezawa, B. Jeyadevan, 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), Graduate school of engineering, and Department of Geoscience and technology-Tohoku University [Sendai]

Subjects
Materials science, heat pipe, Ionic bonding, Thermodynamics, 02 engineering and technology, 01 natural sciences, [SPI.MAT]Engineering Sciences [physics]/Materials, Nuclear magnetic resonance, Boiling, heat transfer, 0103 physical sciences, ionic magnetic fluid, ComputingMilieux_MISCELLANEOUS, 010302 applied physics, Critical heat flux, Thermomagnetic convection, equipment and supplies, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Electronic, Optical and Magnetic Materials, Magnetic field, Heat pipe, Heat transfer, real-time visual observation, 0210 nano-technology, human activities, Nucleate boiling
Abstract

Real-time visual observation of boiling water-based and ionic magnetic fluids (MFs) and heat transfer characteristics in heat pipe using ionic MF stabilized by citrate ions (JC-1) as working liquid are reported. Irrespective of the presence or absence of magnetic field water-based MF degraded during boiling. However, the degradation of JC-1 was avoided by heating the fluid in magnetic field. Furthermore, the heat transfer capacity of JC-1 heat pipe under applied magnetic field was enhanced over the no field case.

Published
2002

17. A Nanoscale Hybrid System Based on Gold Nanoparticles and Heteropolyanions

Author

Valérie Cabuil, Cédric R. Mayer, Sophie Neveu, 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
Materials science, Colloidal gold, gold nanoparticles, Hybrid system, Nanotechnology, General Medicine, General Chemistry, heteropolyanions, [CHIM.INOR]Chemical Sciences/Inorganic chemistry, Nanoscopic scale, ComputingMilieux_MISCELLANEOUS, Catalysis
Abstract

International audience

Published
2002

18. Fully compatible magneto-optical sol-gel material with glass waveguides technologies : application to mode converters

Author

Renata Kekesi, Elise Ghibaudo, Jean-Emmanuel Broquin, Damien Jamon, Hadi Amata, Sophie Neveu, François Royer, Marie-Françoise Blanc-Mignon, 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), Institut de Microélectronique, Electromagnétisme et Photonique - Laboratoire d'Hyperfréquences et Caractérisation (IMEP-LAHC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National Polytechnique de Grenoble (INPG)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), 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 Hubert Curien (LHC), Institut d'Optique Graduate School (IOGS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS), and Université Jean Monnet - Saint-Étienne (UJM)

Subjects
010302 applied physics, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Magnetism, business.industry, Composite number, Physics::Optics, 02 engineering and technology, 7. Clean energy, 01 natural sciences, Condensed Matter::Soft Condensed Matter, symbols.namesake, 020210 optoelectronics & photonics, Optics, 0103 physical sciences, Faraday effect, 0202 electrical engineering, electronic engineering, information engineering, symbols, Transmittance, Magnetic nanoparticles, Optoelectronics, Thin film, business, ComputingMilieux_MISCELLANEOUS, Photonic crystal, Sol-gel
Abstract

To overcome the difficult problem of the integration of magneto-optical materials with classical technologies, our group has developped a composite magneto-optical material made of a hybrid organic-inorganic silica type matrix doped by magnetic nanoparticles. Thin films of this material are obtained through a soft chemistry sol-gel process which gives a full compatibility with an integration on glass substarte. Due to an interesting magneto optical activity (Faraday rotation of 310°/cm) several magneto-optical functionnalities have been realized. A thin film of such composite material coated on a pyrex™ substrate acts as non-reciprocal TE/TM mode converter. An hybrid stucture made of a composite film coated on an ion-exchanged glass waveguide has been realized with a good propagation of light through a hybrid mode. Finally, the sol gel process has been adapted in order to obtain 3D inverse opals which should behave as magnetophotonic crystals. Transmittance curves reveal the photonic band gap of such opals doped with magnetic nanoparticles.

Published
2011

19. Magnetic fiel effects on viscous fingering of a ferrofluid in a radial Hele-Shaw cell

Author

Sophie Neveu, Wietze Herreman, P. Molho, Laboratoire Louis Néel (LLN), 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), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Ferrofluid, Materials science, Field (physics), dendrites, Field effect, magnetic field, Viscous liquid, fractales, 01 natural sciences, 010305 fluids & plasmas, Physics::Fluid Dynamics, Viscous fingering, 0103 physical sciences, 010306 general physics, Anisotropy, Nonlinear Sciences::Pattern Formation and Solitons, ComputingMilieux_MISCELLANEOUS, viscous fingering, Condensed matter physics, equipment and supplies, Condensed Matter Physics, Electronic, Optical and Magnetic Materials, Magnetic field, Hele-Shaw flow, Ferrofluids, [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft]
Abstract

We have studied the effects of a magnetic field on viscous fingering when a ferrofluid is pushed in a more viscous liquid in a circular Hele–Shaw cell. The main effect of the magnetic field, as already known, is to stabilize interfaces parallel to the field and to destabilize interfaces normal to the field. Depending on the growth regime (quasi static, fingering, dendritic growth), which depends on parameters like the cell thickness and oil viscosity, the combination of field effect and anisotropy is analyzed through the various observed patterns.

Published
2005

20. 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

21. 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

22. 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

23. 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

24. 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

25. 3D Hybrid nanonetworks from gold-functionalized nanoparticles

Author

Sophie Neveu, Valérie Cabuil, Cédric R. Mayer, Neveu, Sophie, 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
[CHIM.INOR] Chemical Sciences/Inorganic chemistry, Materials science, Functionalized nanoparticles, Mechanics of Materials, Mechanical Engineering, gold nanoparticles, General Materials Science, Nanotechnology, Self-assembly, Nanonetwork, [CHIM.INOR]Chemical Sciences/Inorganic chemistry, Hybrid material, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2002

26. Photonic Hall effect in ferrofluids: theory and experiments

Author

B. A. van Tiggelen, F. Donatini, David Lacoste, J.A. Serughetti, Sophie Neveu, Department of Physics, University of Pennsylvania [Philadelphia], Laboratoire de Recherche sur les capteurs à colloides et l'instrumentation (LRCCI), Université Jean Monnet [Saint-Étienne] (UJM), Laboratoire de Physicochimie Inorganique, Université Pierre et Marie Curie - Paris 6 (UPMC), 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, Laboratoire de physique et modélisation des milieux condensés (LPM2C), Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), University of Pennsylvania, 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
Ferrofluid, Materials science, FOS: Physical sciences, 02 engineering and technology, Condensed Matter - Soft Condensed Matter, 01 natural sciences, Physics::Fluid Dynamics, symbols.namesake, Hall effect, 0103 physical sciences, Faraday effect, Rayleigh scattering, 010306 general physics, Anisotropy, ComputingMilieux_MISCELLANEOUS, [PHYS]Physics [physics], Condensed matter physics, Scattering, Disordered Systems and Neural Networks (cond-mat.dis-nn), Condensed Matter - Disordered Systems and Neural Networks, 021001 nanoscience & nanotechnology, Polarization (waves), Magnetic field, Condensed Matter::Soft Condensed Matter, symbols, Soft Condensed Matter (cond-mat.soft), 0210 nano-technology
Abstract

An experimental and theoretical study on the Photonic Hall Effect (PHE) in liquid and gelled samples of ferrofluids is presented. The ferrofluids are aqueous colloidal suspensions of Fe(_{2})CoO(_{4}) particles, which can be considered as anisotropic and absorbing Rayleigh scatterers. The PHE is found to be produced by the orientation of the magnetic moments of the particles, as is also the case for the Faraday effect. The dependence of the PHE with respect to the concentration of the scatterers, the magnetic field and the polarization of the incident light is measured in liquid and in gelled samples and is compared to a simple model based on the use of a scattering matrix and the single scattering approximation., Comment: 20 pages, 11 figures, submitted

Published
2000

27. Synthesis of very fine maghemite particles

Author

R. Massart, A. Bee, Sophie Neveu, Laboratoire de Physicochimie Inorganique (URA 1662), Université Pierre et Marie Curie - Paris 6 (UPMC), and Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Diffraction, Magnetic measurements, Materials science, Analytical chemistry, ferrofluid, Maghemite, 02 engineering and technology, engineering.material, 010402 general chemistry, 01 natural sciences, Ion, chemistry.chemical_compound, Nuclear magnetic resonance, Ultrafine particle, ComputingMilieux_MISCELLANEOUS, Magnetite, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 0104 chemical sciences, Electronic, Optical and Magnetic Materials, maghemite, chemistry, Transmission electron microscopy, engineering, nanoparticles, 0210 nano-technology
Abstract

The effect of citrate ions on the growth of magnetite particles is investigated. ‘Ultrafine’ particles have been obtained (diameter of the order of 20 A) that were converted to maghemite. The characterisation of the maghemite particles by various techniques (X-ray diffraction, transmission electron microscopy, magnetic measurements) is described.

Published
1995

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