The use of porous anodic alumina as a contact mask for ion-milling is demonstrated here to produce highly regular periodic arrays of nano-holes or bosses in an aluminum surface. The interaction of the molten aluminum with the alumina can be either wetting or non-wetting, according to the temperature of the melt, resulting in the formation of bosses (see Figure) or holes.
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AlMawlawi et al. (2000) studied this question.