화학공학소재연구정보센터
Applied Surface Science, Vol.258, No.18, 6864-6869, 2012
Papillaes-enhanced hydrophobicity of large-sized polytetrafluoroethylene-polyphenylene sulfite soft film prepared by layer-by-layer construction
Large-sized superhydrophobic soft film with hierarchical structures were prepared by combining papillaes on the polytetrafluoroethylene-polyphenylene sulfite (PTFE-PPS) surface via layer-by-layer construction on the glass substrate and heat treatment processes, therein, the papillaes were formed by 0.1 mu m PTFE coated on the pollen grains. The water contact angles (CAs)and sliding angles (SAs) of the films are strongly dependent on the number density of the papillaes on the PTFE-PPS surface. A superhydrophobic surface with a water CA = 151.5 degrees and SA = 4 degrees was obtained when the number density was about 649 mm(-2). The papillaes with micro/submicroscale structures play an important role in the formation of the superhydrophobic surface and can change Wenzel-type surface into Cassie-Baxter-type surface. The condensation of water vapor on the Cassie-Baxter-type PTFE-PPS film is much more difficult than that of on the Wenzel-type film. Our method may develop into a facile method to prepare large-sized soft film with low cost, which limited only by the size of the loading substrates. (C) 2012 Elsevier B. V. All rights reserved.