Influence of HNO3 on Rheological Properties of AlOOH Sol

Abstract

Abstract: In order to control the coating process in the preparation of alumina ceramic membrane, AlOOH sol was prepared by using aluminum isopropoxide as the raw material and HNO₃ as the peptizer. The influence of the amount of HNO₃ on the rheological properties of AlOOH sol was studied through rotational rheometer and Zeta potential measurement. The results show that when the molar ratio of HNO₃ to aluminum isopropoxide R(n(HNO₃):n(Al(C₃H₇O₃)₃)) is in the range of 0.3 to 0.6, AlOOH sol exhibits pseudoplastic fluid characteristics. The Herschel-Bulkley model was used to fit the rheological test data. As R increases, the fluid index (n) decreases, while the consistency coefficient (k_HB) increases. The storage modulus (G′) and loss modulus (G″) increase with the increase of R. The intersection of G′ and G″ in the frequency sweep gradually approaches the low frequency with the increase of R. With the increase of R, the pseudoplasticity of AlOOH sol increases, the consistency increases, the elasticity and viscosity both increase, and it is easier to gelation. While R is above 0.7, it has been transformed into a gel, which does not conform to the fluid law. The level of the Zeta potential affects the dispersibility of the AlOOH sol, thereby affects the above phenomenon.

Key words: ceramic membrane, AlOOH sol, HNO₃, aluminum isopropoxide, rheological property, Zeta potential

CLC Number:

TQ174

ZHANG Xiangtai, DUAN Ning, LU Chenglong, ZHANG Yinfeng, LI Chongrui. Influence of HNO₃ on Rheological Properties of AlOOH Sol[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(11): 3756-3761.

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Influence of HNO₃ on Rheological Properties of AlOOH Sol

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