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Characteristics of silica‐coated TiO 2 and its UV absorption for sunscreen cosmetic applications
Author(s) -
Jaroenworaluck A.,
Sunsaneeyametha W.,
Kosachan N.,
Stevens R.
Publication year - 2006
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.2313
Subject(s) - rutile , anatase , brookite , materials science , chemical engineering , coating , absorption (acoustics) , cosmetics , calcination , nanomaterials , transmission electron microscopy , nanotechnology , photocatalysis , chemistry , organic chemistry , composite material , catalysis , engineering
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 . Copyright © 2006 John Wiley & Sons, Ltd.