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Received March 2, 2004
Accepted August 30, 2004
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Alumina막의 특성에 미치는 PVA의 첨가 효과
Effect of PVA Addition on the Properties of Alumina Membranes
건양대학교 화학공학과, 320-711 충남 논산시 내동 26 1순천대학교 화학공학과, 540-742 전남 순천시 매곡동 315 2한국에너지기술연구원 에너지시스템연구부, 305-343 대전시 유성구 장동 71-2
Department of Chemical Engineering, Konyang University, 26, Nae-dong, Nonsan, Chungnam 320-711, Korea 1Department of Chemical Engineering, Suncheon National University, 315, Maegok-dong, Sunchon, Chonnam 320-711, Korea 2Energy System Division, Korea Institute of Energy Research, 71-2, Jang-dong, Yuseong-gu, Daejeon 305-343, Korea
Korean Chemical Engineering Research, October 2004, 42(5), 570-576(7), NONE Epub 18 November 2004
Abstract
Aluminum isopropoxide(AIP)를 출발물질로 Sol-Gel법에 의해 가수분해 및 해교과정을 거친 후 binder로서 Poly(vinyl alcohol)(PVA)을 첨가하여 boehmite 졸을 제조하였다. 이 졸을 α-alumina 관형 지지체 위에 dip-coating하여 γ-alumina막을 제조하였다. 이 과정 중 첨가된 PVA가 제조된 막의 균열, 기공크기, 결정크기 및 비표면적에 미치는 영향을 살펴보았다. PVA를 첨가하지 않은 졸을 사용하여 코팅한 경우 막의 표면에 균열이 발생하였으나, PVA를 첨가한 졸을 사용하여 코팅한 경우 균열이 발생되지 않았다. 또한 PVA가 첨가된 경우가 첨가되지 않은 경우보다도 결정 및 기공 크기가 커졌으며 더 큰 비표면적을 보였다.
Boehmite sol was prepared using aluminum isopropoxide (AIP) as a starting material through the process of hydrolysis/peptization by a sol-gel method. Poly (vinyl alcohol) (PVA) as a binder was added to the boehmite sol after the peptization step. Supported α-alumina membranes were prepared by dip-coating the boehmite sol on α-alumina support. The effect of PVA addition to the boehmite sol on crystalline size, specific surface area, and pore size was studied, as well as crack formation during drying of the membrane. The addition of PVA resulted in a crack-free γ-Al2O3 membrane with a larger pore diameter and crystalline size and a higher specific surface area compared to a membrane prepared without PVA.
Keywords
References
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Brinker JC, Scherer GW, Sol-Gel Science, The Physics and Chemistry of Sol-Gel Processing, Academic Press (1990)
Park HJ, "Alumina Coatings on Stainless Steel by the Sol-Gel Method", M. A. Thesis, Yonsei University, Seoul (1987)
Larcot A, Fabre JP, Guizard C, J. Membr. Sci., 39(3), 203 (1988)
Uhlhorn RJR, Zaspalis VT, Keizer K, Burggraaf AJ, J. Membr. Sci., 66(2-3), 271 (1992)
Sing KSW, Everett DH, Hanl RAW, Moscou L, Pierotti RA, Rouquerol J, Siemieniewska T, Pure Appl. Chem., 57, 603 (1985)
Pecharroman C, Gonzalez-Carreno T, Iglesias JE, J. Mater. Res., 11(1), 127 (1996)
Shyu SS, Yang WP, Lee ES, Chao AC, Mater. Chem. Phys., 45(2), 108 (1996)
Uhlhorn RJR, Keizer K, Burggraaf AJ, J. Mater. Sci., 27, 527 (1992)
Song KC, Kim JH, J. Colloid Interface Sci., 212(1), 193 (1999)
Brunauer S, Deming LS, Deming WS, Teller E, J. Am. Chem. Soc., 62, 1723 (1940)
de Boer JH, The Structure and Properties of Porous Materials, Butterworths, Reading, Mass (1975)
Pecharroman C, Gonzalez-Carreno T, Iglesias JE, J. Mater. Res., 11(1), 127 (1996)
