| Nanoporous copper (NPC) ribbons were synthesized by free corrosion dealloying in a 6 wt.% HCl solution for different corrosion times with Mn70Cu30 alloy ribbons prepared by single-roller melt spinning processing equipment for precursor samples. The microstructures and components of NPC were characterized by utilizing FE-SEM and EDS analysis. Additionally, 2-value digital image technique was used to process FE-SEM images, and porous structures of copper ribbons were quantitative characterized by fractal theory. The results showed that Mn was selectively dissolved from Mn70Cu30 alloy ribbons in HCl solution, and prepared NPC was uniform network-like structure, with the average ligament size of 114-214 nm and the average pore size in the range of 325-520 nm for different corrosion time. Porous structure of NPC is of typical fractal characteristic with fractal dimension in the range of 1.59-1.74. Fractal dimension reflects the heterogeneity of porous structure, thus, porosity of NPC can be characterized by fractal dimension. |
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