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163 results on '"Amiens C"'

1. Tailoring the Magnetic Anisotropy in CoRh Nanoalloys: Experiment and Theory

Author

Muñoz-Navia, M., Dorantes-Dávila, J., Zitoun, D., Amiens, C., Jaouen, N., Rogalev, A., Respaud, M., and Pastor, G. M.

Subjects
Condensed Matter - Materials Science
Abstract

The magnetic moments and magnetic anisotropy energy (MAE) of CoRh alloy nanoparticles are determined experimentally and theoretically. Non-trivial correlations between chemical order, magnetic order and MAE are revealed. A remarkable non-monotonous dependence of the MAE as a function of composition and chemical order is observed that opens novel possibilities of tuning the magnetic properties of nanoalloys. The observations are successfully compared and analyzed with our electronic calculations. In this way we clearly demonstrate that the induced 4d moments and the 3d-4d interfaces are the key parameters controlling the magneto-anisotropic behavior., Comment: 4 pages, 3 figures

Published
2008
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4. Hydrogenation in water of mono- and disaccharides to polyols using Ni-Fe/SiO2 catalysts: optimization of the reaction conditions and beneficial effects of Fe

Author

Sadier, Achraf, Robert, F., Amiens, C., Philippot, K., Wojcieszak, Robert, Marceau, Eric, Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), and Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)

Subjects
[CHIM]Chemical Sciences
Abstract

International audience

Published
2021

5. Synthèse de nanocatalyseurs Fe-Ni supportés sur SiO2 par voie organométallique

Author

Robert, F., Lecante, P., Moreau, A., Collière, V., Meunier, J.-F., Sadier, A., Wojcieszak, Robert, Marceau, Eric, Amiens, C., Philippot, K., Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), and Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)

Subjects
[CHIM]Chemical Sciences
Abstract

National audience

Published
2021

6. Organometallic synthesis of FeNi nanocatalysts for the hydrogenation of sugars

Author

Robert, F., Lecante, P., Collière, V., Sadier, Achraf, Wojcieszak, Robert, Girardon, Jean-Sébastien, Marceau, Eric, Amiens, C., Philippot, K., Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), and Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)

Subjects
[CHIM]Chemical Sciences
Abstract

International audience

Published
2021

7. Supported FeNi nanocatalysts : an organometallic route for a diversity of systems

Author

Robert, F., Lecante, P., Collière, V., Sadier, Achraf, Wojcieszak, Robert, Girardon, Jean-Sébastien, Marceau, Eric, Amiens, C., Philippot, K., Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), and Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)

Subjects
[CHIM]Chemical Sciences
Abstract

International audience

Published
2021

8. X-Ray magnetic circular dichroism studies of FeRh nanoparticles

Author

Smekhova, A., Ciuculescu, D., Lecante, P., Wilhelm, F., Amiens, C., Rogalev, A., and Chaudret, B.

Subjects
Magnetic moment -- Analysis, Nanoparticles -- Analysis, Business, Electronics, Electronics and electrical industries
Abstract

[Fe.sub.x][Rh.sub.100-x] (x = 50, 80) nanoparticles (NPs) with an average diameter of ~2 nm were prepared by simultaneous decomposition of stoichiometric quantities of Fe[[N[(Si[([CH.sub.3]).sub.3]).sub.2])].sub.2] and Rh[([C.sub.3][H.sub.5]).sub.3] using two different routes: 1) a standard hydrogenation procedure and 2) a new one based on use of amino-borane as a reducing agent. All samples were found to be superparamagnetic with a blocking temperature below 10 K. Results of X-Ray magnetic circular dichroism (XMCD) experiments at the Fe K-edge and the Rh [L.sub.2,3] edges have shown that not only iron but also rhodium atoms are magnetic as a result of hybridization of Fe 3d states with 4d states of Rh. The total induced magnetic moment of Rh atoms as well as its spin and orbital contributions are shown to depend on chemical composition of [NP.sub.S] and the preparation method. Index Terms--Induced magnetic moment, magnetic nanoparticles, X-ray magnetic circular dichroism.

Published
2008

9. Chemisorption on nickel nanoparticles of various shapes: lnfluence on magnetism

Author

Cordente, N., Amiens, C., Chaudret, B., Respaud, M., Senocq, F., and Casanove, M.-J.

Subjects
Ligands -- Magnetic properties, Organometallic chemistry -- Research, Nickel -- Magnetic properties, Physics
Abstract

Nanoparticles of nickel have been obtained in solution through reaction of an organometallic precursor, Ni(COD)(sub 2) (COD=cycloocta-1, 5-diene), with dihydrogen, in the presence of various stabilizing agents. This stabilizing agent was selected for the production of nickel anorods, and the influence of ligands on the effective anisotropy is discussed.

Published
2003

10. Synthesis and magnetism of CoxRh(sub 1-x) and CoxRu(sub 1-x) nanoparticles

Author

Zitoun, D., Amiens, C., Chaudret, B., Fromen, M.-C., Lecante, P., Casanove, M.-J., and Respaud, M.

Subjects
Ruthenium -- Research, Ruthenium -- Magnetic properties, Chemistry, Physical and theoretical -- Research, Chemicals, plastics and rubber industries
Abstract

The synthesis of CoxRh(sub 1-x) and CoxRu(sub 1-x) alloys of nanometric size dispersed in a polymer matrix through the simultaneous decomposition of the organometallic precursors in solution in mild conditions is described. These structural studies enable to find some analogies between three CoM systems (M= Ru, Rh, Pt).

Published
2003

11. Nanoscale bimetallic CoxPt1-x particles dispersed in poly(vinylpyrrolidone): synthesis from organometallic precursors and characterization

Author

Ely, T. Ould, Pan, Cheng, Amiens, C., Chaudret, B., Dassenoy, F., Lecante, P., Casanove, M.-J., Mosset, A., Broto, J.-M., and Respaud, M.

Subjects
Laminated metals -- Research, Organometallic chemistry -- Research, Chemicals, plastics and rubber industries
Abstract

It has been possible to demonstrate the synthesis of CoxPt1-x particles of nanometric size dispersed in an inert organic matrix through the simultaneous decomposition of the organometallic precursors Co(eta3-C8H13)(eta4-C8H12) and Pt2(dba)3 in solution in mild conditions.

Published
2000

19. Chemisorption on nickel nanoparticles of various shapes: Influence on magnetism.

Author

Cordente, N., Amiens, C., Chaudret, B., Respaud, M., Senocq, F., and Casanove, M.-J.

Subjects
*CHEMISORPTION, *NICKEL, *NANOPARTICLES, *SPECTRUM analysis, *X-ray diffraction
Abstract

Nanoparticles of nickel have been obtained in solution through reaction of an organometallic precursor, Ni(COD)[sub 2] (COD=cycloocta-1,5-diene), with dihydrogen, in the presence of various stabilizing agents. X-ray diffraction studies evidence a face-centered-cubic structure for all samples. Spherical isolated superparamagnetic nanoparticles (d∼4.5 nm) are produced in the presence of poly(N-vinylpyrrolid-2-one). They display a magnetization value comparable to that of bulk nickel, as determined from superconducting quantum iinterference device (SQUID) measurements. Exposure of the surface of the nanoparticles to CO, leading to CO coordination as monitored by infrared spectroscopy, or to methanol, strongly reduces their magnetization. This reduction corresponds respectively to one or two magnetically inactive layers of nickel atoms at the nanoparticles surface. The production of elongated nanoparticles was favored when either trioctylphosphineoxide or hexadecylamine (HDA) were used as stabilizing agents. In this case, SQUID measurements show that only HDA preserves the magnetization of the surface. This stabilizing agent was selected for the production of nickel nanorods. The influence of ligands on the effective anisotropy is discussed. © 2003 American Institute of Physics. [ABSTRACT FROM AUTHOR]

Published
2003
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20. Ultrasmall iron nanoparticles: effect of size reduction on anisotropy and magnetization

Author

Lacroix, L.-M., Lachaize, S., Falqui, A., Blon, T., Carrey, J., Respaud, M., Dumestre, F., Amiens, C., Margeat, O., Chaudret, B., Lecante, P., and Snoeck, E.

Subjects
Anisotropy -- Analysis, Iron -- Magnetic properties, Mossbauer spectroscopy -- Usage, Superconducting quantum interference devices -- Usage, Physics
Abstract

The synthesis and characterization of nanoparticles (NPs) with magnetic properties close to those of bulk are described by using superconducting quantum interference device (SQUID) and Mossbauer measurements. The magnetic anisotropy energy constant has increased up to ten times the bulk one.

Published
2008

21. Co nanocrystals engineering

Author

Fontaiña-Troitiño, N, primary, Ciuculescu-Pradines, D, additional, Correa-Duarte, M A, additional, Salgueiriño, V, additional, and Amiens, C, additional

Published
2017
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25. Tailoring the Magnetic Anisotropy in CoRh Nanoalloys: Experiment and Theory

Author

Mu��oz-Navia, M., Dorantes-D��vila, J., Zitoun, D., Amiens, C., Jaouen, N., Rogalev, A., Respaud, M., and Pastor, G. M.

Subjects
Condensed Matter - Materials Science, Materials Science (cond-mat.mtrl-sci), FOS: Physical sciences
Abstract

The magnetic moments and magnetic anisotropy energy (MAE) of CoRh alloy nanoparticles are determined experimentally and theoretically. Non-trivial correlations between chemical order, magnetic order and MAE are revealed. A remarkable non-monotonous dependence of the MAE as a function of composition and chemical order is observed that opens novel possibilities of tuning the magnetic properties of nanoalloys. The observations are successfully compared and analyzed with our electronic calculations. In this way we clearly demonstrate that the induced 4d moments and the 3d-4d interfaces are the key parameters controlling the magneto-anisotropic behavior., 4 pages, 3 figures

Published
2008

26. Comparison of l a Hydroxyvitamin D3 and 25 Hydroxyvitamin D3 in the Treatment of Renal Osteodystrophy. Greater Effect of 25 Hydroxyvitamin D3 in Mineralizing Bone

Author

Fournier, A., primary, Bordier, P., additional, Gueris, J., additional, Ferriere, C., additional, Chanard, J., additional, Marie, P., additional, Sebert, J. L., additional, Bedrossian, J., additional, DeLuca, H. J., additional, Amiens, C. H. U., additional, and Lichwitz, A., additional

Published
1977
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28. Design of FeBi nanoparticles for imaging applications

Author

Branca, M., primary, Pelletier, F., additional, Cottin, B., additional, Ciuculescu, D., additional, Lin, C.-C., additional, Serra, R., additional, Mattei, J.-G., additional, Casanove, M.-J., additional, Tan, R., additional, Respaud, M., additional, and Amiens, C., additional

Published
2014
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37. Magnetic properties of CoNRhMnanoparticles: experiment and theory

Author

Muñoz-Navia, M., primary, Dorantes-Dávila, J., additional, Zitoun, D., additional, Amiens, C., additional, Chaudret, B., additional, Casanove, M.-J., additional, Lecante, P., additional, Jaouen, N., additional, Rogalev, A., additional, Respaud, M., additional, and Pastor, G. M., additional

Published
2008
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