Electrodeposited nanostructured cobalt film and its dual modulation of both superhydrophobic property and adhesiveness

Microstructure and characterization of a novel cobalt coating prepared by cathode plasma electrolytic deposition

“…Han Xiao et al have found a novel shell-like cobalt nanostructure by galvanostatic electrochemical deposition which exhibits prominent superhydrophobic property [35]. Particularly, there have been increasing interests concentrated on the magnetic applications in the fields such as micro-electromechanical system devices, data storage media, magnetic recording and reading heads, and so on [36][37][38][39][40].…”

Relationship between the structure and water repellency of nickel–cobalt alloy coatings prepared by electrodeposition process

“…Wang et al [32] suggested that the change of wettability is attributed to the adsorption of oxygen molecules on the topmost layer of CuO. Xiao et al [29] proposed that the formation of a layer of dense cobalt oxide film which has low surface energy could be a plausible explanation for the observed wettability change for Co coating. Liu et al [19] demonstrated that the hierarchical micro/nanostructures and spontaneous adsorption of airborne hydrocarbons endowed the metallic surfaces with super-hydrophobicity.…”

“…After exposure the Ni-Co coating in air for two weeks, the intensity of metallic nickel and cobalt peaks is slightly reduced and those of NiO, CoO peaks are greatly increased, which confirms that the surface is covered by oxide. Previous researches have proved that the oxide formation on the metallic surface will reduce the wettability by reducing the surface free energy [27,29]. However, almost all of oxides have high surface energy, and thus, it cannot be the reason for the gradual wettability transition [19].…”

“…This morphological change decreased the hydrophobicity of the deposit. On the other hand, Xiao et al [29] investigated the effect of current density and time in cobalt coating in constant thickness growth by electrodeposition process. They pointed out that increasing the current density changed the morphology of cobalt coating from big shells to pyramids.…”

“…They pointed out that increasing the current density changed the morphology of cobalt coating from big shells to pyramids. The Co films with fluffy shell structures exhibited prominent superhydrophobicity, while the films with nano-cones hold water with high adhesion [29].…”