earticle

영어

The pure TiO2 particles have been prepared in vapor-phase hydrolysis of titanium tetraisopropoxide(TTIP). The rate of TTIP hydrolysis was so fast that the overall rate of formation of TiO2 was controlled by the rate of mixing of TTIP and H2O. Thus, the primary TiO2 particles were prepared in nano sizes to form chainlike aggregates due to rapid coagulation. The pure TiO2 particles as prepared were amorphous at the reactor set temperatures below 400℃ and became anatase at the temperatures of 450℃ above while the weak rutile peaks were also observed above 800℃. The actual size of primary particles as prepared were reduced by increasing the reactor set temperature while their crystalline sizes as well as BET sizes increased by post-sintering.