Preparation of thick films by electrophoretic deposition using surface modified silica particles derived from sol-gel method

Thick films were prepared by the electrophoretic sol-gel deposition of orga nically modified, sub-micron silica particles. The silica particles were mo dified with 3-aminopropyltriethoxysilane (APS) and vinyltriethoxysilane (VT ES). Smooth and crack-free films ca. 15 mu m thick were obtained when APS m odified silica particles were used for the cathodic electrophoretic deposit ion. Thick films with decreased open spaces among particles were obtained w hen silica particles modified with VTES were co-deposited with an organic p olymer, polyethylene maleate.