| Issue |
Korean Chemical Engineering Research,
Vol.42, No.5, 570-576, 2004
Vol.42, No.5, 570-576, 2004
Alumina막의 특성에 미치는 PVA의 첨가 효과
Effect of PVA Addition on the Properties of Alumina Membranes
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:
Alumina Membrane; Sol-Gel Method; Pore Size Distribution; γ-Al2O3; Boehmite; Poly (vinyl alcohol); Crystalline Size
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