HOU Hefeng, TIAN Hui, CHEN Yuqing
(School of Material Science and Engineering, Shandon Ins titute of Light Indus try, 250100)
Abstract: Hydrophobic silica - based thin films were prepared by means of sol- gel process , phase separation and self- as sembly (SA). A thin film with desired surface roughness was obtained by mixture of HCl- catalyzed acid sol with NH4OH- catalyzed alkaline sol and phase separation of tetraethyl- orthos ilicate (TEOS) induced by addition of polyacrylic acid (PAA). After further modification by a self- as sembled monolayer, the film's wetting properties changed and became hydrophobic. Films with different PAA content showed different hydrophobicity.
Keywords: hydrophobic, sol- gel process , phase separation