title: Fabrication of superhydrophobic surfaces from microstructured ZnO-based surfaces via a wet-chemical route.
abstract: The fabrication of a superhydrophobic surface is demonstrated via a wet chemical route, and this method offers advantages of being cleanroom free, cost efficiency, and wide applicability. The preferable growth of ZnO crystalline forms a microstructured surface, and a variety of alkanoic acids were adopted to tune the surface wettability. Although all surfaces show an advancing contact angle greater than 150 degrees , they substantially differ in the wetting mechanisms. It is found that only when the length of alkanoic acid is greater than 16, the microstructured surface shows a stable superhydrophobicity, in which the Cassie state dominates. While for those moderate-length alkanoic acids (C8-C14), their corresponding surfaces have a tendency to fall into the Wenzel state and display a great contact angle hysteresis.
authors.affiliation: Department of Chemistry, School of Chemistry and Chemical Technology, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China. xdwu@sjtu.edu.cn
authors.forename: Xuedong
authors.initials: X
authors.lastname: Wu
authors.forename: Lijun
authors.initials: L
authors.lastname: Zheng
authors.forename: Dan
authors.initials: D
authors.lastname: Wu
mesh_terms: D057927:Hydrophobic and Hydrophilic Interactions; D008855:Microscopy, Electron, Scanning; D013499:Surface Properties; D014867:Water / Q000737:chemistry*; D015034:Zinc Oxide / Q000737:chemistry*
chemical_list: D014867:Water; D015034:Zinc Oxide