The effect of sulphuric acid, phosphoric acid and oxalic acid on pore formation in pharmaceutical aluminum foil by single step anodization technique was observed. The anodization reaction was carried out in each acidic medium by subjecting it to the passage of current for specified time intervals thereby forming a nanoporous film over the anodic surface. The concentration of acid, voltage and the time required for each acidic medium was reflected in the pore formation which was observed by scanning electron microscope. Uniform and highly ordered pore formation over the anodic surface was observed for highly concentrated acidic medium as compared to the weaker acids. The detailed findings and discussions on pore formation by several acidic mediums are discussed in the paper.
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