Stability of a dispersion of particles covered by a charge-regulated membrane: effect of the sizes of charged species

被引:7
|
作者
Hsu, JP [1 ]
Huang, SW
Kuo, YC
Tseng, SJ
机构
[1] Natl Taiwan Univ, Dept Chem Engn, Taipei 10617, Taiwan
[2] Natl Chung Cheng Univ, Dept Chem Engn, Chiayi 62102, Taiwan
[3] Tamkang Univ, Dept Math, Taipei 25137, Taiwan
关键词
stability ratio; charge-regulated surface; amphoteric surface; ionic sizes;
D O I
10.1016/S0021-9797(03)00197-8
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 influence of the sizes of charged species on the stability of a colloidal dispersion is investigated theoretically. We consider the case where a particle comprises a rigid core and an amphoteric, charge-regulated membrane layer, which simulates biocolloids and particles covered by artificial membranes. A modified Poisson-Boltzmann equation, which takes the sizes of all the charged species into account, is adopted to describe the electrical field. The effects of other key parameters such as electrolyte concentration, pH, and the valence of counterions on the behavior of a dispersion are also examined. We show that the larger the effective size of the counterions, the greater the stability ratio, which is consistent with experimental observations in the literature. (C) 2003 Elsevier Science (USA). All rights reserved.
引用
收藏
页码:73 / 80
页数:8
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