title: Macroscopic-wetting anisotropy on the line-patterned surface of fluoroalkylsilane monolayers.
abstract: Micropatterned fluoroalkylsilane monolayer surfaces with liquidphilic/liquidphobic area (line width 1-20 microm) were prepared with few defects by vacuum ultraviolet (VUV) photolithography. The anisotropic wetting of a macroscopic droplet with a 0.5-5 mm diameter on the micropatterned surfaces was investigated. The strong anisotropy of the contact angle and the sliding angle and droplet distortion for fluoroalkylsilane/silanol patterned surfaces was attributed to the difference in the energy barrier of wetting between parallel and orthogonal lines. The wetting anisotropy decreased with decreases in the liquidphilic area. Fluoroalkylsilane/alkylsilane patterned surfaces with small differences in the surface free energies of the components showed anisotropic wetting only for the low-surface-tension liquids.
authors.affiliation: Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan.
authors.forename: Masamichi
authors.initials: M
authors.lastname: Morita
authors.forename: Tomoyuki
authors.initials: T
authors.lastname: Koga
authors.forename: Hideyuki
authors.initials: H
authors.lastname: Otsuka
authors.forename: Atsushi
authors.initials: A
authors.lastname: Takahara