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

页码：1323 / 1325

页数：3

共 15 条

[1] PROCESSING OF HIGHLY CONCENTRATED AQUEOUS ALPHA-ALUMINA SUSPENSIONS STABILIZED WITH POLY-ELECTROLYTES [J].