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Publications: Articles

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References

2016

Articles:

Turgis, R., Arrachart, G., Dubois, V., Dourdain, S., Virieux, D., Michel, S., Legeai, S., Lejeune, M., Draye, M. and Pellet-Rostaing, S.
Dalton Transactions, 45(Copyright (C) 2016 American Chemical Society (ACS). All Rights Reserved.):1259-1268
2016

Resume: The extn. of rare earth elements (REEs) from nitric acid soln. with a triphosphine trioxide (TPO) is presented. Performances of such a ligand in ionic liqs. vs. a classical solvent (benzyl ether) are compared. TPO seems to be 10 to 100 times more efficient when it is dissolved in ionic media whatever the concn. of nitric acid involved. Mechanistic investigations reveal that cation exchange classically obsd. in ionic liqs. is not consistent with the exptl. data. Moreover, clear differences in the TPO/Ln complexes between classical and ionic media are highlighted. A stable complex of 1 lanthanide for 3 TPO is formed in an ionic liq. whereas a complex of 1 lanthanide for 6 to 9 TPO is formed in benzyl ether. Back extn. is also studied and good recovery of REEs could be obtained. The TPO/ionic liq. system shows remarkable performances i.e. efficiency and selectivity towards lanthanides in a simulated leaching soln. of a Nd/Fe/B/Dy magnet. [on SciFinder(R)]

Equipe: Département CP2S : Chimie et électrochimie des matériaux

2014

Articles:

ZHOU, T., COLIN, M., CANDOLFI, C., Boulanger, C., DAUSCHER, A., Santava, E., HEJTMANEK, J., BARANEK, P., AL RAHAL AL ORABI, R., POTEL, M., Fontaine, B., GOUGEON, P., Gautier, R. and LENOIR, B.
Chemistry of Materials, 26(16):4765-4775
2014

Resume: We present a detailed study of the evolution of the electrical, galvanomagnetic, and thermodynamic properties of polycrystalline AgxMo9Se11 compounds for 3.4 ? x ? 3.8 at low temperatures (2?350 K). In agreement with density functional theory calculations, the collected data show an overall gradual variation in the transport properties from metallic to semiconducting behavior on going from x = 3.4 to 3.8. The results evidence subtle variations in the electronic properties with the Ag content, typified by both positive and negative phonon-drag effects together with thermopower and Hall coefficient of opposite signs. Analysis of the data suggests that these features may be due to peculiarities of the dispersion of the valence bands in the vicinity of the chemical potential. A drastic influence of the Ag content on the thermal transport was evidenced by a pronounced change in the temperature dependence of the specific heat below 10 K. Nonlinearities in the Cp(T3) data are correlated to the concentration of Ag atoms, with an increase in x resulting in a more pronounced departure from a Debye law. The observed behavior mirrors that of ionic conductors, suggesting that AgxMo9Se11 for x ? 3.6 might belong to this class of compounds.

Equipe: Département CP2S : Chimie et électrochimie des matériaux

Samih, Y., Marcos, G., Stein, N., Allain, N., Fleury, E., Dong, C. and Grosdidier, T.
Surface and Coatings Technology,
2014

Mots clefs: High Current Pulsed Electron Beam Treatment (HCPEB) Surface hardening Corrosion Phase selection Phase transformation Martensitic steel

Resume: Abstract The surface of the AISI 420 martensitic stainless steel was subjected to High Current Pulsed Electron Beam (HCPEB) treatment. The microstructure in the melted layer consisted of a three phase mixture: (i) fine ?-Fe grains formed via epitaxial growth from the substrate, (ii) larger ?–grains nucleated from the top surface of the melt and (iii) some needles-like variants issued from the solid state martenitic transformation. Despite this complex multi-phase microstructure, the corrosion performance, tested in a sulfuric acid solution, was significantly enhanced by the HCPEB treatment. The increase in corrosion potential and delayed pitting are essentially attributed to an increase in Cr content, rising from 13.3 wt. % in the bulk to about 14 wt. % at the surface, together with a very limited amount of surface craters. This low density of craters did not give rise to significant deep hardening in the sub-surface but the top surface melted layer hardness was increased by more than 50% because of the triggering of the martensitic transformation.

Equipe: Département CP2S : Chimie et électrochimie des matériaux

Maas, M., Diliberto, S., de Vaulx, C., Azzouz, K. and Boulanger, C.
Journal Electronic Materials, 43(10):3857-3862
2014

Mots clefs: Bismuth telluride thick films soluble anode thermoelectric

Equipe: Département CP2S : Chimie et électrochimie des matériaux

2013

Articles:

Guyot, E., Seghir, S., Lecuire, J.M., Boulanger, C., Levi, M.D., Shilina, Y., Dargel, V. and Aurbach, D.
Journal of Electrochemical Society, 160(3):A420-A425
2013

Equipe: Département CP2S : Chimie et électrochimie des matériaux

Ahlers, Michael, Stein, Nicolas, Broch, Laurent and Brand, Izabella
Journal of Electroanalytical Chemistry, 706(0):140-148
2013

Mots clefs: Collagen molecule Self-assembly Au electrode In situ ellipsometry Capacitance Polarization modulation infrared reflection–absorption spectroscopy (PM IRRAS)

Resume: Abstract The influence of the potential applied to the polycrystalline gold electrode on the adsorption state and structure of collagen molecules were studied by means of electrochemistry, in situ ellipsometry and in situ polarization modulation infrared reflection–absorption spectroscopy. At the macroscopic level, potential and the corresponding charge accumulated on the gold electrode determine the adsorption process of the collagen film on the Au electrode surface. The protein film is stable on the electrode surface at potentials close to the potential of zero charge. The protein film sustains a large negative potential drop (??M|S ? ?0.5 V) whereas it is unstable at a small positive potential drop (??M|S ? 0.1 V) across the film. Positive net charge accumulated on the Au surface causes electrostatic repulsions of collagen molecules bearing a positive net charge. Loosening of water and destabilization of the protein film reflect repulsions between the Au electrode and the collagen molecules. In contrast, at charge densities between ?8 < ?M < ?20 ?C cm?2 electrostatic attractions between the electrode surface and the protein molecule appear. A stable, well hydrated collagen film is formed on the Au surface. Higher negative charges accumulated on the electrode surface lead to swelling on the protein film by water and lead to the desorption of the protein film from the Au surface. In situ spectroelectrochemical studies show that at the molecular level neither the secondary structure nor the orientation of collagen molecules are affected by electrical potentials. Independently of the applied potential and electric fields acting on the film the collagen molecule maintains its native structure. Collagen molecules adsorbed on the Au surface form a heterogeneous film with well-defined structure and unusual stability at the molecular level.

Equipe: Département CP2S : Chimie et électrochimie des matériaux

2012

Articles:

Amaral-Labat, G., Szczurek, A., Fierro, V., Stein, N., Boulanger, C., Pizzi, A. and Celzard, A.
Biomass & Bioenergy, 39:274-282
2012

Equipe: Département CP2S : Chimie et électrochimie des matériaux

2011

Articles:

Traore, Y., Legeai, S., Diliberto, S., Arrachart, G., Pellet-Rostaing, S. and Draye, M.
Electrochimica Acta, 58:532-540
2011

Equipe: Département CP2S : Chimie et électrochimie des matériaux

Total:
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