Abstract
Various procedures are suggested for obtaining alumina foils containing parallel cylindrical pores of uniform diameter over the size range of 1.5–20 nm. Pores larger than 6 nm are obtained by anodizing aluminum foils in solutions of sulfuric acid at low temperatures and subsequently etching them in a phosphoric acid solution. Smaller pores are obtained by anodizing 30–60-nm-thick aluminum films at low temperatures in a dilute sulfuric acid bath or in a bath containing a mixture of sulfuric and tartaric acids.
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