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Anodic aluminium oxide (AAO) is an aluminum surface finishing technique used for corrosion, abrasion, and decorative purposes. During the anodizing process, the aluminum work piece is subject to electrochemical polarization which induces passivation of the surface thereby creating a thin layer of alumina. Depending on the anodizing voltage, different morphologies of the alumina film can be obtained. The alumina layer can also be dyed to create a variety of color effects which are used for decorative and aesthetic purposes. The color effect is a result of light absorption and scattering in the alumina pores.
AAO can be used as a template in the preparation of metal nanostructures due to its spatially ordered structure and large free volume. In particular, AAO has the potential to act as a nanoporous substrate for cell culture applications. In this article, we investigate the biomedical potential of a new AAO template by using it as the growth medium for the Cercopithecus aethiops kidney epithelial cell line.
The pore channels in the AAO membranes provide a route for the cells to exchange molecules and nutrients at the cell surface. In addition, the alumina pore walls can be modified with a wide range of shapes to control cell behavior. In this study, we realized designable AAO templates with state-of-the-art controllability over the in-plane pore shape and spatial configuration of pore arrangement. This is achieved by intentionally introducing unequal aluminum anodization rate and modulating the anodization difference at different AVs.
