Preparation and application of nanoporous metals by using dealloying in a metallic melt

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Novel method for preparation of open-cell nanoporous base metals by using dealloying reaction in a metallic melt was successfully developed. By immersing an alloy precursor into a metallic melt, specific component was dissolved selectively into a metallic melt and the remaining component self-organized into a nanoporous structure. The analyses on microstructure and compositional changes revealed that the diffusion of solute atom in the metallic melt is a rate limiting step and that the ligament size coarsened for surface relaxation via surface diffusion mechanism. These results indicated that the formation mechanism of nanoporous structure by dealloying in metallic melt is essentially the same with that in aqueous solution.