Synthesis of Nanosized TiO<TEX>$_2$</TEX> Powder by Chemical Vapor Condensation Process(1)

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

Journal of the Korean Ceramic Society 1999;36(7): 742.

화학기상응축법에 의한 TiO$_2$ 나노분말의 합성 (1)

김신영, 유지훈, 이재성, 김종렬¹, 김병기²

한양대학교 금속재료공학과
¹한양대학교 금속재료공학
²한국기계연구원

Synthesis of Nanosized TiO$_2$ Powder by Chemical Vapor Condensation Process(1)

ABSTRACT

Nanosized TiO2 powders were synthesized using the chemical vapor conduensation (CVC) process with various precursor feeding rates (0.37 and 0.752 ml/min) and oxygen flow rates(1-2slm) conditions and powder characteristics were investigated in terms of formation of nanosized powder varying with the above processing conditions. For this study the main thermodynamic and fluid dynamic factors -supersaturation ratio collision frequency and residence time-were theoretically established and compared to the characteristics of formed TiO2 powder. The loosely combined anatase phase powders (including less than 3%of rutile phase) having 20-30nm crystallite size were obtained at overall conditions. The particle size and th degree of agglomeration for a precursor flow rate of 0.376 ml/min turn out to be smaller than for a flow rate of 0.742ml/min. And the decreasing of particles size and particle size distribution were observed with increasing oxygen flow rate as the residence time and collision frequency were reduced by increasing oxygen flow rate,. It appears that further scrutiny is needed to elucidate the influence of the individual thermodynamic and kinetic parameters

Key words: TiO$_2$, Nanosized Powder, Chemical Vapor Condensation (CVC) Process