Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 22, Issue 24, Pages 11922-11926Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2jm31710a
Keywords
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Funding
- Russian Foundation for Basic Research [09-03-01123, 09-03-12246, 10-02-00634]
- Russian Ministry of Education and Science [16.513.11.3011, 16.512.11.2164).]
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Porous anodic aluminium oxide has a long history of practical application for corrosion protection and coloring. In the last few decades a lot of hi-tech applications of this material have been found owing to the discovery of anodization conditions leading to the formation of highly ordered porous structures with a narrow pore size distribution. Here we show that in-plane orientation of the porous system in anodic films on aluminium is fully determined by the intrinsic crystallographic orientation of the Al substrate. The anisotropy of aluminium oxidation rates on a scalloped metal-oxide interface leads to reorientation of Al spikes in certain directions, which builds up an in-plane orientational order on a macroscopic scale restricted by a crystallite size. This is a unique example of the inheritance of the substrate crystal structure by an amorphous film through a size difference of three orders of magnitude.
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