Electrostatic free energy of interacting ionizable double layers

被引:63
作者
Biesheuvel, PM [1 ]
机构
[1] Wageningen Univ, Lab Phys Chem & Colloid Sci, NL-6703 HB Wageningen, Netherlands
关键词
electrostatic force free energy; double layer; interaction; colloid stability; charge regulation;
D O I
10.1016/j.jcis.2004.02.069
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 electrostatic contribution to the interaction free energy of charge-regulating materials, similar as well as dissimilar, contains electric work as well as chemical work and can be obtained from an integration over the diffuse part of the double layer together with a summation of the surface contribution to the free energy over the two surfaces. Examples for the surface contribution are given for acid, base, zwitterionic, and amphoteric (1-pK and 2-pK) materials for a diffuse double layer and for the Stern-Gouy-Chapman model, with and without ion adsorption. For charge-regulating materials, the electrostatic contribution to the interaction free energy at contact (adhesion force of curved surfaces, or particles) is always finite and can be obtained from a simple calculation. (C) 2004 Elsevier Inc. All rights reserved.
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页码:514 / 522
页数:9
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