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References

Articles:

Cascales, J.P., Martin, L., Dulluard, A., Hehn, M., Tiusan, C., Szczepa?ski, T., Dugaev, V., Barnaš, J. and Aliev, F.G.
IEEE Transactions on Magnetics, 49(7):4347-4350
2013

Equipe: Département P2M : Nanomagnétisme et Electronique de Spin

Cascales, J.P., Martin, L., Dulluard, A., Hehn, M., Tiusan, C., Szczepa?ski, T., Dugaev, V., Barna?, J. and Aliev, F.G.
IEEE Transactions on Magnetics, 49(7):4347-4350
2013

Equipe: Centre de Compétences : MiNaLor micro et nanotechnologies

Addou, R., SHUKLA, A. K., Deniozou, Th, Heggen, M., Feuerbacher, M., Groening, O., Fournee, V., Dubois, J. -M. and Ledieu, J.
SURFACE SCIENCE, 611:74-79
2013
ISSN: 0039-6028

Equipe: Département CP2S : Métallurgie et Surfaces

Duday, D., Clement, F., Lecoq, E., Penny, C., Audinot, J.-N., Belmonte, T., Kutasi, K., Cauchie, H.-M. and Choquet, P.
Proceedings of the National Academy of Sciences of the United States of America, soumis
2013

Equipe: Département CP2S : Expériences et Simulations des Plasmas Réactifs - Interaction plasma-surface et Traitement des Surfaces ESPRITS

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

Ochoa, E.A., Droppa, R., Basso, R.L.O., Morales, M., Cucatti, S., Zagonel, L.F., Czerwiec, T., Dos Santos, M.C., Figueroa, C.A. and Alvarez, F.
Materials Chemistry and Physics, 143:116-123
2013

Resume: The low energy (similar to 50-350 eV) noble gases ion bombardment of the steel surface shows that the pre-treatments increase nitrogen diffusion by modifying the outermost structure of the material. The surface microstructure and morphology of the studied samples were characterized by Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM). The crystalline and chemical structures in the outermost layers of the surface were analyzed by grazing angle X-ray diffraction (GAXRD) and photoemission electron spectroscopy (XPS). Temperature effusion studies of the implanted ions are used to elucidate the noble gases site localization in the network. The local compressive stress induced by the nearby iron atoms on the core level electron wave functions of the trapped noble gases are studied by photoemission electron spectroscopy (XPS) and interpreted considering a simple mechanical model. Nano-hardness measurements show the dependence of the material elastic constant on the energy of the implanted noble gases. Although the ion implantation range is about few nanometers, the atomic attrition effect is larger enough to modify the material structure in the range of micrometers. Two material stress zones were detected where the outermost layers shows compressive stress and the underneath layers shows tensile stress. The implanted noble gases can be easily removed by heating. A diffusion model for polycrystalline-phase systems is used in order to discuss the influence of the atomic attrition on the N diffusion coefficient. The concomitant effect of grain refining, stress, and surface texture on the enhancing nitrogen diffusion effect is discussed.

Equipe: Département CP2S : Expériences et Simulations des Plasmas Réactifs - Interaction plasma-surface et Traitement des Surfaces ESPRITS

Armbruester, M., Behrens, M., Foettinger, K., Friedrich, M., Gaudry, E., Matam, S. K. and SHARMA, H. R.
CATALYSIS REVIEWS-SCIENCE AND ENGINEERING, 55(3):289-367
2013
ISSN: 0161-4940

Equipe: Département CP2S : Métallurgie et Surfaces

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