Tetra-n-Butoxy Titaniumからの加水重合体の加熱分解法による酸化チタン被覆中空シラス球状体の開発 [in Japanese] Development of TiO_2-Coated Hollow Volcanic Glass Spheres by a Thermal Decomposition Method of Hydrolytic Polymers from Tetra-n-Butoxy Titanium [in Japanese]
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TiO2 -coated hollow volcanic glass spheres (Shirasu-balloons) were developed by a thermal decomposition method of hydrolytic polymers from tetra-n-butoxy titanium, and their properties were investigated. Hollow volcanic glass spheres of above 100 μm were coated with titania hydrate formed by a moistening process by steam Ti (OCH2 CH2 CH2 CH3 )4 during heating at 95 °C for 40 minutes. After drying at 120 °C in air for 12 hours, these coated spheres were performed by heat treatment for 2 hours in air at temperature ranges of 400 ∼ 1,100 °C for the purpose of controlling of crystal structure from anatase to rutile.The tetra-n-butoxy titanium could be transformed very easily into titania hydrate by using the moistening process using steam. The crystal structure formed in temperature range from 400 to 800 °C was anatase. With increasing the temperature of above 800 °C, the anatase structure was transformed into rutile and then completed only rutile at 1,100 °C. SEM analysis of the surface before and after heat treatment revealed homogeneous coating layers with TiO2 .
- Journal of MMIJ
Journal of MMIJ 115(2), 107-110, 1999-02-25
The Mining and Materials Processing Institute of Japan