均一沈殿法による単分散ＴｉＯ２粉末の作製

Abstract

For obtaining monodispersed Ti02 particles, precipitaion from homogeneous solution (PFHS) method using urea as precipitant was applied at 343K for the formation of titanium hydroxide particles containing sulfate radical from aqueous solution of titanyl sulfate and urea. In the present study, influence of ultrasonic vibration on precipitation reaction was also discussed from the results of TG-DTA analysis, X-ray diffraction, SEM images and particle distribution analysis.As-prepared precipitates were amorphous particles, and crystalized completely on heating process up to about 1300K with dissociating hydrate and sulfate radical to anatase type Ti02 powder at about 900K and to rutile type Ti02 at about 1400K. Particle size and degree of monodispersion of Ti02 obtained by adding ultrasonic vibration on reaction was smaller and more proceeded than those obtained by conventional precipitation reaction.