Preparation of Silica Microspheres Containing UV-Shielding Materials by Impregnation Method and Their UV-Shielding Ability

Abstract

Silica microspheres containing UV-shielding materials were prepared by impregnation method and their shielding ability was investigated. The UV-shielding materials, CeO₂, ZnO, and TiO₂, were supported 1-20% on the silica microspheres, of which size was 1, 5, and 10, μm. In general, the greater the content of the UV-shielding material was or the smaller the particle size of silica microsphere was, the greater the UV-shielding ability was. Silica microsphere prepared by impregnation method shielded more UV and transmitted more visible region than that by suspension method. Silica microsphere containing ZnO prepared by suspension method did not shield UV, while that prepared by impregnation method did.