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73 results on '"Bernard, M.C."'

58. Chemical synthesis of hollow sea urchin like nanostructured polypyrrole particles through a core–shell redox mechanism using a MnO2 powder as oxidizing agent and sacrificial nanostructured template.

Author

Benhaddad, L., Bernard, M.C., Deslouis, C., Makhloufi, L., Messaoudi, B., Pailleret, A., and Takenouti, H.

Subjects
*NANOSTRUCTURED materials, *SEA urchins, *CHEMICAL synthesis, *POLYPYRROLE, *OXIDATION-reduction reaction, *MANGANESE oxides, *CHEMICAL templates, *METAL powders, *OXIDIZING agents
Abstract

Highlights: [•] A nanostructured polypyrrole powder is synthesized via a redox core–shell mechanism. [•] For that, a nanostructured MnO2 powder is used as oxidizing sacrificial template. [•] Reaction product is a pure and conducting PPy powder with a large specific area. [•] Its stoichiometry and production of soluble Mn2+ cations are clearly evidenced. [•] These new data will strengthen control in the synthesis of MnO2/PPy composite materials. [Copyright &y& Elsevier]

Published
2013
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65. Raman spectroscopy analysis of polypyrrole films as protective coatings on iron

Author

Nguyen Thi Le, H., Bernard, M.C., Garcia-Renaud, B., and Deslouis, C.

Subjects
*PYRROLES, *RAMAN spectroscopy, *COATING processes, *IRON
Abstract

In situ Raman spectroscopy was used to study the redox modifications of electropolymerized polypyrrole (Ppy) films used as protective coatings on iron. A preliminary study of the redox behavior of Ppy on platinum was carried out for highlighting the most sensitive bands to potential variations: the 1560–1620 cm−1 as well as the 930 and 980 cm−1 peaks show a strong dependence on the applied potential. In situ Raman spectra of Ppy on iron were recorded at different times after immersion in a 3% NaCl solution. They formally display the same peaks as those found for platinum, allowing to characterize the redox state of the Ppy film at the solution/film interface. Additional ex situ Raman spectra allowed to identify the corrosion products at the Ppy/metal interface. These results complement kinetics analysis early developed to understand the protection mechanism and its loss. [Copyright &y& Elsevier]

Published
2004
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69. Research In Brief Comparison of the experiences of having a sick baby in a neonatal intensive care unit among mothers with and without the right of abode in Hong Kong.

Author

Yam, Bernard M.C. and Sau Kan Au, Bernard M.C.

Subjects
*PSYCHOLOGY of the sick, *MOTHER-child relationship, *PSYCHOLOGY of women, *PSYCHOLOGICAL adaptation
Abstract

Compares experiences of having a sick baby in neonatal intensive care among mothers with and without the right of abode in Hong Kong, China. Health status of illegal entrants; Demographic characteristics; Coping strategies used by women.

Published
2004
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