Nanosized TiO 2 is used extensively in sunscreen cosmetics as an inorganic UV absorber that can allow an optically transparent film to be applied to human skin. TiO 2 is known to exist in three crystal forms: anatase, brookite and rutile. The rutile phase is generally used as a component in sunscreen cosmetics because of its higher UV absorption. A surface coating can be added to nanosized TiO 2 to enhance its UV absorption by a different light diffraction mechanism. Silica-coated nanosized TiO 2 is examined in this study for this purpose. The nanosized TiO 2 has been synthesized using hydrolysis of tetra-isopropylorthotitanate (TIPT) as a precursor. After a calcination process, nanosized TiO 2 was formed and subsequently its surface modified by coating with tetraethoxysilane (TEOS) as the source of the silica. The same coating method was applied to nanosized commercial TiO 2 , to compare the surface characteristics. The resulting powders of coated TiO 2 were examined by transmission electron microscopy (TEM) and analyzed by energy dispersive analysis (EDS), respectively. UV-vis spectroscopy was used to study the differences and effectiveness of the coated and uncoated TiO 2 .
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