Abstract
Bulk NPC (nanoporous copper) were fabricated by dealloying xAl(100−x)Cu (x=60, 70at.%) alloy slices in NaOH solutions (10, 20 and 30wt.%) under free corrosion conditions. The results show that Al–Cu alloy slices can be completely dealloyed. The synergetic dealloying of Al2Cu and AlCu results in the formation of uniform NPC with small-sized channels. The dealloying of α-Al and Al2Cu plays an important role in the formation of NPC with two kinds of structures of both small-sized uniform ligaments–channels and hierarchical skeleton-like (large-sized channels with highly porous walls) structure, and these two structures form layer-cake structure.
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