Anodic Aluminium Oxide
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Anodic Aluminium Oxide
Anodic aluminium oxide, anodic aluminum oxide (AAO), or anodic alumina is a self-organized form of aluminium oxide that has a honeycomb-like structure formed by high density arrays of uniform and parallel pores. The diameter of the pores can be as low as 5 nanometers and as high as several hundred nanometers, and length can be controlled from few tens of nanometers to few hundred micrometers. Porous AAO is formed by electrochemical oxidation (anodization) of aluminum in acid electrolytes in the conditions that balance the growth and the AAO films are formed with limited thickness. Anodizing aluminum has been widely used since early last century for corrosion protection and decorative purposes. The porous nature of anodic alumina films was discovered in the 1930s and further elaborated in the 1950s–1970s. Processes for producing anodic aluminum oxide membranes using chromic acid, sulfuric acid, oxalic acid, or phosphoric acid appear in a patent attributed to Alan W. Smith of t ...
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SEM Of AAO
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