NEW METHOD FOR EFFICIENT COLLOIDAL PARTICLE PACKING VIA MODULATION OF REPULSIVE LUBRICATING HYDRATION FORCES

被引：178
|
作者：
VELAMAKANNI, BV
CHANG, JC
LANGE, FF
PEARSON, DS
机构：
[1] Materials Department, College of Engineering, University of California, Santa Barbara
来源：
LANGMUIR | 1990年 / 6卷 / 07期
关键词：
D O I：
10.1021/la00097a023
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
A simple method is described for increasing the viscosity of dispersed (20 vol ‥alumina) suspensions over 4 orders of magnitude through weak aggregation with certain indifferent electrolytes containing hydrolyzable anions. Particles in the viscous slurry, which are covered with short-range repulsive hydration layers, can be packed to a high density during pressure consolidation by apparent lubrication-assisted particle rearrangement. A combination of short-range (<5 nm) repulsive (lubricating) hydration force and longe-range attractive van der Waals force explains the observed viscosity-consolidation behavior of these slurries. This method provides an alternate to the presently used formulations for stabilizing concentrated colloidal slurries used in the processing of structural ceramics. © 1990, American Chemical Society. All rights reserved.
引用
收藏
页码：1323 / 1325
页数：3
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