Abstract

Silica films with various surface morphologies, such as flatness, mesoporosity, uneveness, convexity, were prepared by hydrolysis and polymerization of tetraethoxysilane, Si(OC2H5)4(TEOS) and methyltrietoxysilane, CH3Si(OC2H5)3(MTES) under acid-catalyzed conditions. The morphology of coatings could be changed by changing the molar ratio (denoted as f, f=KITES/TEOS) in TEOS-MTES mixture, as well as the conditions of drying process and heat treatment temperature. Especially, in the case of 5<f≤7.5, the surface of coatings was uneven, when films were prepared at humidities higher than 45RH%. Water repellent glasses obtained by coating hydrolyzed heptadecafluorodecyltrimethoxysilane, CF3(CF2)7CH2CH2Si(OCH3)3 on to this uneven surface showed an excellent abrasion resistance and UV-light stability for windows of automobiles and buildings.

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