title: Superhydrophobicity of electrospray-synthesized fluorinated silica layers.
abstract: The preparation of superhydrophobic SiO(2) layers through a combination of a nanoscale surface roughness and a fluorination treatment is reported. Electrospraying SiO(2) precursor solutions that had been prepared by a sol-gel chemical route produced very rough SiO(2) layers. Subsequent fluorination treatment with a solution containing trichloro(1H,1H,2H,2H-perfluorooctyl)silane resulted in highly rough, fluorinated SiO(2) layers. The fluorinated rough SiO(2) layers exhibited excellent repellency toward various liquid droplets. In particular, water repellency of 168° was observed. On the bases of Cassie-Baxter and Young-Dupre equations, the surface fraction and the work of adhesion of the rough, fluorinated SiO(2) layers were respectively estimated. In light of the durability in water, ultraviolet resistance, and thermal stability, the superhydrophobic SiO(2) layers prepared in this work hold promise in a range of practical applications.
authors.affiliation: School of Materials Science and Engineering, Inha University, Incheon 402-751, Republic of Korea.
authors.forename: Eun-Kyeong
authors.initials: EK
authors.lastname: Kim
authors.forename: Chul-Sung
authors.initials: CS
authors.lastname: Lee
authors.forename: Sang Sub
authors.initials: SS
authors.lastname: Kim
mesh_terms: D005782:Gels; D054879:Halogenation; D057927:Hydrophobic and Hydrophilic Interactions; D053758:Nanoparticles; D012821:Silanes / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry* / Q000378:metabolism*; D013499:Surface Properties; D013696:Temperature; D014466:Ultraviolet Rays; D014867:Water / Q000737:chemistry*; D017155:Wettability
chemical_list: D005782:Gels; D012821:Silanes; D014867:Water; D012822:Silicon Dioxide