Preparation And Application Of Superhydrophobic Films

As superhydrophobic surfaces had attracted much attention. Various methods had beenreported for constructing superhydrophobic surface. However, most of these methods involveexpensive materials and complex multi-step processing, limiting their practical applications.In this report, I will introduce three simple fabrications of superhydrophobic surface.Superhydrophobic cobalt(Co) coating with micro-nanofiber structure was rapidlyfabricated by a one-step electrodeposition process. The Co coating electrodeposited at 20 Vfor 5 min displays superhydrophobicity with a contact angle of 160? and a sliding angle of6.2?. The superhydrophobicity of the coating is derived from the form of the cobalt myristateon its surface and the special micro-nanofiber structure. Excessive electrodeposition time orvoltage change the micro-nanofiber structure of the coating and then decrease its cotact angle.The coating surface can be switched from superhydrophobic to hydrophilic by heating in anoven and then dipping in the ethanol solution of 0.1 M myristic acid. In addition, the preparedCo coating displays better corrosion resistance than the bare Cu substrate.The corresponding anodic copper surface displays superhydrophobicity with a contactangle of 153° after electrodeposition for 2 h. Meanwhile, the resulting anodic copper surfacesonly have superhydrophobicity in the neutral, weak alkaline or acid aqueous solutions. Thesuperhydrophobicity of the anodic copper surfaces results from the formation of the myristatecompounds with low surface energy on their surfaces and their special micro-/nanostructures.The facile and low-cost fabrication process is composed from the electrodeposition intraditional Watts bath and the heat-treatment in the presence of triethoxysilane(AC-FAS). Thesuperhydrophobicity of the surface results from its micro-nanostructure and the assembly oflow-surface-energy fluorinated components on it. The superhydrophobic surface exhibits highmicrohardness and excellent mechanical abrasion resistance because it maintainssuperhydrophobicity after mechanical abrasion against 800 grit Si C sandpaper for 1.0 m at theapplied pressure of 6.0 k Pa. Moreover, the superhydrophobic surface has good chemicalstability in both acidic and alkaline environments. The potentiodynamic polarization andelectrochemical impedance spectroscopy test shows that the as-prepared superhydrophobicsurface has excellent corrosion resistance that can provide effective protection for the bare Cusubstrate.