Direct measurement of the depletion interaction in a charged colloidal dispersion

被引:97
作者
Sharma, A [1 ]
Walz, JY [1 ]
机构
[1] TULANE UNIV, DEPT CHEM ENGN, NEW ORLEANS, LA 70118 USA
来源
JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS | 1996年 / 92卷 / 24期
关键词
D O I
10.1039/ft9969204997
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
Direct measurement of the depletion interaction between electrically charged surfaces has been obtained using the optical technique of total internal reflection microscopy (TIRM). The long-range interaction between a polystyrene sphere and a polished glass plate was measured in aqueous solutions of non-adsorbing colloidal silica particles (all surfaces were negatively charged). The measured potential-energy profiles displayed a repulsive potential at large separations, followed by a depletion attraction at closer distances. At increasing silica concentrations, evidence of a long-range oscillatory behaviour was observed. Comparison of the measured energies to those predicted using a force-balance model indicate that the non-adsorbing silica particles contribute slightly to the screening of the electrostatic interaction between the polystyrene particle and plate. Adjustment for this screening produces good agreement between theory and experiment.
引用
收藏
页码:4997 / 5004
页数:8
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