96 Korean Chem. Eng. Res., Vol. 42, No. 1, February, 2004, pp. 96-101 Sol-Gel Nanoporous Alumina Membrane Alumina Sol * * † 320-711 26 * 305-343 71-2 (2003 9 22 , 2003 12 12 ) Preparation of Alumina Sol for Nanoporous Alumina Membrane by Sol-Gel Method Ja-Lyong Park, Tae-Hwan Kim*, Jae-Suk Sung* and Ki-Chang Song † Department of Chemical Engineering, Konyang University, 26, Nae-dong, Nonsan, Chungnam 320-711, Korea *Energy System Division, Korea Institute of Energy Research, 71-2, Jang-dong, Yuseong-gu, Daejeon 305-343, Korea (Received 22 September 2003; accepted 12 December 2003) Sol-Gel aluminum isopropoxide(AIP) , alumina(boehmite) . , . 100 o C boehmite , 500 o C γ-alumina . HCl/AIP=0.10 600 o C 4 nm . HCl . Abstract - Alumina (boehmite) sol was prepared by the sol-gel method from aluminum isopropoxide (AIP) through hydrol- ysis and peptization processes. Powders were obtained by drying the sol in drying oven, and the powder properties, such as crystalline phase composition and pore structure, were studied as a function of heat-treatment temperatures. The powders showed boehmite phase at 100 o C, and transformed to γ-alumina at 500 o C. The powders, heat-treated at 600 o C after being peptized at HCl/AIP=0.10, had 4 nm in average pore diameter. The average pore diameter of the powders decreased with increasing HCl concentrations added during peptization process, but increased with increasing heat-treatment temperatures. Key words: γ-Alumina, Alumina Sol, Aluminum Isopropoxide, Boehmite, Hydrolysis, Pore Diameter, Peptization, Sol-Gel Method 1. , , ( ), , , , [1-3]. , , . , Knudsen , [4]. . [4]. . [4]. (CVD)[5], (electroless plating)[6], (spray pyrolysis)[7], Sol-Gel [3] . Sol-Gel , . Sol-Gel † To whom correspondence should be addressed. E-mail: [email protected]
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Korean Chem. Eng. Res., Vol. 42, No. 1, February, 2004, pp. 96-101
Sol-Gel�� �� Nanoporous Alumina Membrane� Alumina Sol ��
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(2003! 9" 22# $%, 2003! 12" 12# &')
Preparation of Alumina Sol for Nanoporous Alumina Membrane by Sol-Gel Method
Ja-Lyong Park, Tae-Hwan Kim*, Jae-Suk Sung* and Ki-Chang Song†
Department of Chemical Engineering, Konyang University, 26, Nae-dong, Nonsan, Chungnam 320-711, Korea*Energy System Division, Korea Institute of Energy Research, 71-2, Jang-dong, Yuseong-gu, Daejeon 305-343, Korea
(Received 22 September 2003; accepted 12 December 2003)
Fig. 3. FT-IR spectra of alumina powders heat-treated at different tem-peratures.
Fig. 4. FT-IR spectra of alumina powders heat-treated at 600oC afterbeing peptized at different HCl concentrations.
Fig. 5. TG-DTA curves of alumina powder peptizied at HCl/AIP=0.10condition.
Fig. 6. X-ray diffraction patterns of alumina powders heat-treated atdifferent temperatures after being peptized at HCl/AIP=0.10condition.
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Fig. 7. X-ray diffraction patterns of alumina powders heat-treated at600oC after being peptized at different HCl/AIP conditions.
Fig. 8. Adsorption-desorption isotherms of N2 of alumina powders heat-treated at 600oC.
Fig. 9. Pore size distributions of alumina powders heat-treated at 600oCafter being peptized at different concentrations of HCl.
Fig. 10. Specific surface areas of alumina powders heat-treated at 600oCafter being peptized at different concentrations of HCl.
Fig. 11. Adsorption-desorption isotherms of N2 of alumina powders heat-treated at different temperatures after being peptized at differ-ent concentrations of HCl.
Korean Chem. Eng. Res., Vol. 42, No. 1, February, 2004
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