Abstract
A facile, inexpensive, and general approach is explored for the fabrication of transparent silica/organic silicon hybrid sol, which could form transparent hydrophobic coatings on different substrates conveniently. The sol was prepared by using hexamethyldisilazane (HMDS) as a surface-modifying agent and the source of base catalyst required for the hydrolysis of tetraethoxysilane (TEOS). The resulting silica-based coatings on glass slide have shown an optical transmission over the visible range up to 89% (in reference to 100% transmission defined by a plain glass substrate) and high thermal stability. The water contact angle of the film reached 152○. Hydrophobic coatings with excellent optical transmittance were also successfully formed on writing paper and aluminum foils. The transparent hydrophobic silica-based hybrid sol will have potential applications in creating outdoor building glass, protecting paper files from moisture and preventing metals from corrosion.
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