Studies on the Thixotropy of Magnesium Aluminum Hydroxide-Kaolinite Suspension

Abstract

Abstract: The thixotropy of suspension, the rheological properties change with the increase of shear time, is a complicated rheological phenomenon. The-shear thinning and the shear thickening phenomena, i.e., positive thixotropy and negative thixotropy, were observed respectively in the previous studies. Recently we found a novel thixotropic phenomenon, described as "complex thixotropy", during studying the thixotropic phenomenon of magnesium aluminum hydroxide montmorillonite suspension. The study of thixotropy of the aqueous suspension consisting of magnesium aluminum hydroxide(Mg-Al-MMH)possessing permanent positive and Kaolinite possessing permanent negative charges is reported. The suspensions studied may display a positive thixotropy and complex phenomenon successively in various Mg-Al-MMH/kaolinite ratios 0-0.16 examined. The effect of shear rate( D_L)used in measuring viscosity on the thixotropy of the suspension was investigated, and the mechanism of the thixotropy was discussed.

Key words: Mixed metal layered hydroxide, Kaolinite, Thixoropy, Suspension, Layered double hydroxides

CLC Number:

O648.15

TrendMD:

DAI Xiao-Nan, HOU Wan-Guo, LI Shu-Ping, WANG Xin-Fang . Studies on the Thixotropy of Magnesium Aluminum Hydroxide-Kaolinite Suspension[J]. Chem. J. Chinese Universities, 2001, 22(9): 1578.

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Studies on the Thixotropy of Magnesium Aluminum Hydroxide-Kaolinite Suspension

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