Formation of TiO(OH)<TEX>$_2$</TEX> Ultrafine Particles by Reverse Micelle

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J. Korean Ceram. Soc. > Volume 35(6); 1998 > Article

Journal of the Korean Ceramic Society 1998;35(6): 594.

역마이셀에 의한 TiO(OH)$_2$ 미세분말 제조

장화익, 강석원¹, 이광래¹

강원지방중소기업청
¹강원대학교 공과대학 화학공학과

Formation of TiO(OH)$_2$ Ultrafine Particles by Reverse Micelle

ABSTRACT

Titanium hydroxide (TiO({{{{ {OH }_{2 } }})) fine particles were produced by the reverse micelle technique. For the formation of titanium hydroxide (TiO({{{{ {OH }_{2 } }})) particles with the technique reversed micellar solution was prepared by solubilizing water into organic solvent (isooctane) with a surfactant and titanium alkoxide (tetraisopropyl orthotitanate) diluted with isopropyl alcohol was added to the reversed micellar solution. The hdrolyzed species (TiO({{{{ {OH }_{2 } }})) was formed by the hydrolysis of titanium alkoxide and titanium dioxide is then formed by the condensation of the hydrolyzed species. There are several process variables such as surfactants concentration of surface cosurfactant hydrolysis temperature and pH. In this work the ef-fects of process variables on paticle shapes particle size distribution and paticle agglomeration were bi-nodal for an anionic surfactant(AOT) in the whole range of temperature pH and surfactant concentration of this experiment. The addition of ethanol as a cosurfactant resulted in narrow particle size distribution of the experiment. The additiono of ethanol as a cosurfactant resulted in narrow particle size distribution and 0.12${mu}{textrm}{m}$ of smaller average particle diameter. FT-IR spectrum of particles shows the absorption peak of Ti-OH bonding and Ti-O bonding. An exothermic peak around 41$0^{circ}C$ in TGA-DTA curve shows that crys- tallized anatase phase appears and completely transits to anatase around 45$0^{circ}C$

Key words: Alkoxide, Fine particle, Particle size distribution, Reverse micelle, AOT, Span 80, Surfactant