Sedimentation in silica and alumina suspensions as studied by means of dielectric spectroscopy .2. Surfactant- and polymer-coated particles

被引：0
|
作者：
Pettersen, BH [1 ]
Bergflodt, L [1 ]
Sjoblom, J [1 ]
机构：
[1] UNIV BERGEN,DEPT CHEM,N-5007 BERGEN,NORWAY
来源：
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 1997年 / 127卷 / 1-3期
关键词：
alumina; coating; dielectric spectroscopy; electrophoresis; sedimentation; silica;
D O I：
暂无
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The sedimentation in aqueous suspensions of surface-coated silica and a-alumina has been investigated by means of time domain dielectric measurements in the frequency region 30 MHz to 5 GHz. The particles have been coated with a non-ionic surfactant, nonylphenol hexaethylene oxide (C9PhE6), and a non-ionic polymer, ethyl(hydroxyethyl)cellulose (EHEC). By applying theoretical models for the dielectric response we were able to follow the build-up of the sedimentation volume of the solid particles and thus to follow the difference in stability of the suspensions due to the surface modification of the solid particles. (C) 1997 Elsevier Science B.V.
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页码：175 / 186
页数：12
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