Elaboration électrochimique, caractérisation et compréhension des mécanismes de formation des films d'oxyde d'aluminium nano-poreux organisés

The theoretical structure of highly ordered nanoporous alumina membranes is similar to a honey-comb. However, the ideal structure consisting of a regular cells network is obtained only for very specific anodizing parameters. Several models have been proposed, whereas they are not sufficient to explain entirely the formation of theses structures. In this study, we propose to complete the literature on the influence of various parameters which play a role on the structure of the highly ordered nanoporous alumina and to improve understanding of phenomena involved in the formation of these structures. In particular, we propose an original approach based on anions migration in the barrier layer which permits to explain why anodic oxidation of aluminium leads to ordered structures only for a restricted range of cell voltage which depends on the electrolyte used. Thus, this study brings a new point of view on the process of formation of highly ordered nanoporous alumina in terms of voltage.