The Christaller's Formation Mechanism for the Ordered Nanopores of Anodic Alumina Template

The highly ordered alumina pores were prepared via a two-step anodic oxidation process in the electrolyte of oxalic acid. Five different formation mechanisms of the alumina nanopores are summarized. On the basis of those models, combined with the Christaller's central place theory, a Christaller's formation mechanism of the alumina nanopores is proposed for the first time. It is the mechanical stresses between those pores during the corrosion expansion process that determines the morphology of alumina pores. Anodic oxidation time is too longer, the regular arrangements of pores will be damaged. This mechanism will provide the model analysis and reference value for studies of the formation mechanisms of alumina nanopores.