pH对Mg-Al类水滑石／kaolinite分散体系流变性的影响

J4 ›› 2011, Vol. 46 ›› Issue (7): 26-29.

pH对Mg-Al类水滑石／kaolinite分散体系流变性的影响

戴肖南,王其鹏,赵超

山东轻工业学院化学工程学院, 山东济南 250353

收稿日期:2010-12-19 出版日期:2011-07-20 发布日期:2011-09-08
作者简介:戴肖南(1973- ),女,博士,副教授,研究方向为胶体与界面化学. Email: sddxn@163.com
基金资助:
山东省优秀中青年科学家奖励基金资助项目(2007BS04026)

The effect of pH on the rheology of Mg-Al-HTlc／kaolinite suspensions

DAI Xiao-nan, WANG Qi-peng, ZHAO Chao

Department of Chemical Engineering, Shandong Polytechnic University, Jinan 250353, Shandong, China

Received:2010-12-19 Online:2011-07-20 Published:2011-09-08

摘要/Abstract

摘要：

研究了pH值对Mg-Al型类水滑石化合物 (HTlc)／高岭土(kaolinite)悬浮体流变性的影响。对纯高岭土分散体系,控制剪切速率(D)得到的屈服应力(τy)和控制剪切应力(τ)得到的临界剪切应力(τc)皆随pH的升高先升高后降低,在pH=7左右出现最大值;而对质量比为R=0.25的Mg-Al-HTlc／kaolinite分散体系,其τy和τc在pH=11左右出现最大值。根据HTlc和kaolinite粒子间的相互作用对实验结果的机理进行了探讨。

关键词: 类水滑石;高岭土;剪切应力;分散体系;流变性

Abstract:

The effect of pH on the rheological properties of Mg-Al-Hydrotalcite-like compound／kaolinite suspensions are investigated. For pure kaolinite suspension, both of the yield stress τy obtained in the controlled rate mode and critical shear stress τc obtained in the controlled stress mode increased first and then decreased with the increase of the pH, showing a maximum at about pH=7. But for Mg-Al-hydrotalcite-like compound／kaolinite suspensions with R=0.25, it is showed a maximum at about pH=11. Experimental results are discussed on the basis of the interactions between the HTlc and kaolinite particles.

Key words: hydrotalcitelike compound;kaolinite;shear stress;suspension; rheology

戴肖南,王其鹏,赵超. pH对Mg-Al类水滑石／kaolinite分散体系流变性的影响[J]. J4, 2011, 46(7): 26-29.

DAI Xiao-nan, WANG Qi-peng, ZHAO Chao. The effect of pH on the rheology of Mg-Al-HTlc／kaolinite suspensions[J]. J4, 2011, 46(7): 26-29.

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