Ecosystemes steppiques(Cas de Brezina– El Bayadh)

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Contribution a la comprehension de la qualité des sols de la steppe algerienne (Cas du secteur El Bayadh-Brezina, ouest de l'Algerie)

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ELLIPSOMETRIC STUDY OF ACRYLONITRILE ELECTROPOLYMERISATION ON NICKEL

Nous avons étudié par ellipsométrie les étapes initiales de l'électropolymérisation de l'acrylonitrile sur cathode de nickel dans les conditions électrochimiques définies par G. LECAYON et al./1/ ; nous résumons ici les résultats spécifiques obtenus par l'analyse des mesures optiques, notamment le rôle de l'oxyde natif, la croissance des films électropolymérisés, l'évolution de leurs propriétés électroniques et l'influence du mode de préparation.The initial stages of the electropolymerization of acrylonitrile on a nickel cathode, under the electrochemical conditions defined by LECAYON et al/1/, have been studied by ellipsometry. We describe here the influence of native oxide on the grafting of the monomer, the influence of the preparation conditions on the film structure (homogeneous or not) and, the mode of film conductivity due to free electrons

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Ligand grafting method for immobilization of metal complexes on a carbon electrode

Immobilization of metal complexes on a carbon electrode was successfully carried out via their ligand, of which the functional group on the opposite side of the central metal ion is covalently bonded to the carbon electrode. This method is viewed as a ligand grafting method. The functional group is primary or secondary amine, but not tertiary amine. As metal complexes, Os(bpy)2Cl2 (bpy4,4′-bipyridyl), Ru(bpy)2Cl2, and Os(phen)2Cl2 were used, and as ligands, which act as a bridge between the complex and the carbon electrode, 4-aminopyridine and 4-aminoethylpyridine, were used. Two ligand grafting methods were developed: in one, a ligand by itself was first grafted on carbon through electrochemical cation radical formation in ethanol solution, and then metal complex was refluxed with ligand-grafted carbon to generate metal complex grafted carbon. A second method is for the metal complex to be directly bonded to carbon by the electrochemical cation radical formation