Analysis of the Sol-Gel Coating Process for the Preparation of Supported TiO2 Composite Membranes

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J. Korean Ceram. Soc. > Volume 29(5); 1992 > Article

Journal of the Korean Ceramic Society 1992;29(5): 403.

$TiO_2$ 복합 분리막의 제조를 위한 졸-겔 코팅공정 분석

현상훈, 최영민

연세대학교 세라믹공학과

Analysis of the Sol-Gel Coating Process for the Preparation of Supported TiO2 Composite Membranes

ABSTRACT

The titania membrane thickness coated on the porous alumina support by the sol-gel method was analyzed using the slipcasting model. The thickness of calcined membrane layers increased linearly from 1.3 to 3.8 ${mu}{textrm}{m}$ with the square root of the dipping time (4~40 min). Growth rates of the thickness of wet gels and calcined layers were well described quantitatively by the slipcasting model. Through the regression of experimental data using model equations, the permeability and the pressure drop across wet gels, and the thickness and their growth rate constants of wet gels and calcined layers could be determined. It was also known that the gellation concentration of the TiO2 sol used in this work and the porosity of wet gel layes were 25 mol/ι and 0.53, respectively.