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[交流] 自然-材料：多孔阳极氧化膜机理揭示已有8人参与

Electrochemical oxidation of metals, in solutions where the oxide is somewhat soluble, produces anodic oxides with highly
regular arrangements of pores. Although porous aluminium and titanium oxides have found extensive use in functional
nanostructures, pore initiation and self-ordering are not yet understood. Here we present an analysis that examines the roles
of oxide dissolution and ionic conduction in the morphological stability of anodic films. We show that patterns of pores with
a minimum spacing are possible only within a narrow range of the oxide formation efficiency (the fraction of oxidized metal
atoms retained in the film), which should exist when the metal ion charge exceeds two. Experimentally measured efficiencies,
over diverse anodizing conditions on both aluminium and titanium, lie within the different ranges predicted for each metal.
On the basis of these results, the relationship between dissolution chemistry and the conditions for pore initiation can now be
understood in quantitative terms.

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附件 1 : Morphological instability leading to formation of porous anodic oxide films.pdf

2012-02-02 12:57:23, 772.76 K