Surface Modification of Mica Using TiO<TEX>$_2$</TEX> prepared by Alkoxide Hydrolysis Method

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J. Korean Ceram. Soc. > Volume 36(7); 1999 > Article

Journal of the Korean Ceramic Society 1999;36(7): 691.

알콕사이드 가수분해법에 의핸 제조된 TiO$_2$ 분말을 이용한 Micad의 표면 개질

한상필, 윤영훈, 이상훈¹, 최성철

한양대학교 무기재료공학과
¹대한광업진흥공사 기술연구소

Surface Modification of Mica Using TiO$_2$ prepared by Alkoxide Hydrolysis Method

ABSTRACT

TiO2 powder was adsorbed on the surface of mica using the heterocoagulation method in water TiO2 powder was prepared from hydrolysis of titanium-iso propoxide in a mixed solvent of anhydrous ethanol and water. When the molar ratio of water to titanium iso-propoxide was 0.25 monodispersed spherical TiO2 particles were obtained. The prepared TiO2 powder showed anatase phase after heat treatment at 50$0^{circ}C$ for 2 h and then transformed to rutile phase after heat treatment at 100$0^{circ}C$ for 2h. The iso-electric points of TiO2 and Mica were pH 3.9 and pH 3.25 respectively which were measured by the Z-potential analysis in water base. The maximum Z-potential difference between two powders was observed in the range of pH 3.6~3.7 TiO2 powder was adsorbed on the surface of mica by heterocoagulation method in pH 3.6~3,7 The properties of prepared TiO2 powder was haracterized by TG-DTA, XRD and SEM The morphology and thermal properties of TiO2-adsorbed mica were examined.

Key words: Alkoxide, Heterocoagulation, Hydrolysis, Zeta-potential