Wettability Evolution of Different Nanostructured Cobalt Films Based on Electrodeposition
Micro & nano letters（2017）
摘要
The wettability evolution of eight different types of nanostructured cobalt films is investigated using galvanostatic electrodeposition. The morphology, which evolves from a plump, pea-like structure to cone, pyramid, shell, fluffy cone, fluffy shell and flower structures can be controlled by changing the anion type in the electrolyte or the deposition current density. A growth mechanism is proposed based on cathodic anomalous absorption theory, which explains both the influence of the anion type on the surface structure and the current-dependent morphology evolution. The contact angle and sliding angle of all films are measured, and fractions of water drop contact area with the surrounding air are calculated to illustrate the roughness induced wettability. The hierarchical (nano and micro) structures exhibit eminent superhydrophobicity compared with single dimensional surfaces, indicating this as an effective way to prevent transition from Cassie-Baxter mode to Wenzel mode.
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关键词
wetting,nanostructured materials,cobalt,metallic thin films,electrodeposition,current density,surface morphology,contact angle,surface roughness,hydrophobicity,nanofabrication,wettability,nanostructured cobalt thin films,galvanostatic electrodeposition,anion,electrolyte,current density,cathodic anomalous absorption theory,surface structure,Co,hierarchical microstructures,flower structures,fluffy shell structures,fluffy cone structures,pyramid structures,pea-like structure,plump structures,Wenzel mode,Cassie-Baxter mode,superhydrophobicity,roughness,water drop contact area,sliding angle,contact angle,current-dependent morphology
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