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Korean Chemical Engineering Research,
Vol.42, No.1, 96-101, 2004
Vol.42, No.1, 96-101, 2004
Sol-Gel법에 의한 Nanoporous Alumina Membrane용 Alumina Sol 제조
Preparation of Alumina Sol for Nanoporous Alumina Membrane by Sol-Gel Method
Sol-Gel법에 의해 출발물질로 aluminum isopropoxide(AIP)를 사용하여, 가수분해 및 해교과정을 거쳐 alumina(boehmite)졸을 제조하였다. 또한 이 졸을 건조오븐에서 건조시켜, 분말을 제조한 후 열처리온도에 따른 분말 결정상의 조성과 기공특성을 조사하였다. 100 ℃에서 열처리하여 제조된 분말은 boehmite상을 나타내었으나, 500 ℃에서 γ-alumina로 상전이 되었다. HCl/AIP=0.10의 조건으로 해교된 후 600 ℃로 열처리된 분말은 4 nm의 평균기공 크기를 나타내었다. 또한 해교시 첨가된 HCl양이 증가됨에 따라 기공의 크기는 감소한 반면 열처리 온도가 증가됨에 따라 평균기공의 크기는 증가하였다.
Alumina (boehmite) sol was prepared by the sol-gel method from aluminum isopropoxide (AIP) through hydrolysis 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 ℃, and transformed to γ-alumina at 500 ℃. The powders, heat-treated at 600 ℃ 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.
Keywords:
γ-Alumina; Alumina Sol; Aluminum Isopropoxide; Boehmite; Hydrolysis; Pore Diameter; Peptization; Sol-Gel Method
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