화학공학소재연구정보센터
Langmuir, Vol.26, No.7, 5167-5171, 2010
Constructing a Superhydrophobic Surface on Polydimethylsiloxane via Spin Coating and Vapor-Liquid Sol-Gel Process
In this study, a superhydrophobic surface on polydimethylsiloxane (PDMS) substrate was constructed via the proposed vapor-liquid sot-gel process in conjunction with spill coating of dodecyltrichlorosilane (DTS). Unlike the conventional sot-gel process where the reaction takes place in the liquid phase, layers of silica (SiO2) particles were formed through the reaction between the reactant spin-coated oil the PDMS surface and vapor of the acid solution. This led to the SiO2 particles inlaid oil the PDMS surface. Followed by subsequent spin coating of DTS solution, the wrinkle-like structure was formed, and the static contact angle of the water droplet oil the surface could reach 162 degrees with 2 degrees sliding angle and less than 5 degrees contact angle hysteresis. The effect of layers of SiO2 particles, concentrations of DTS solution and surface topography on superhydrophobicity of the surface is discussed.