Transport in polymer-gel composites: Response to a bulk concentration gradient

被引:12
作者
Hill, RJ
机构
[1] McGill Univ, Dept Chem Engn, Montreal, PQ H3A 2B2, Canada
[2] McGill Univ, McGill Inst Adv Mat, Montreal, PQ H3A 2B2, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
D O I
10.1063/1.2140285
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
This paper examines the response of electrolyte-saturated polymer gels, embedded with charged spherical inclusions, to a weak gradient of electrolyte concentration. An electrokinetic model was presented in an earlier publication, and the response of homogeneous composites to a weak electric field was calculated. In this work, the influence of the inclusions on bulk ion fluxes and the strength of an electric field (or membrane diffusion potential) induced by the bulk electrolyte concentration gradient are computed. Effective ion diffusion coefficients are significantly altered by the inclusions, so-depending on the inclusion surface charge or zeta potential-asymmetric electrolytes can behave as symmetrical electrolytes and vice versa. The theory also quantifies the strength of flow driven by concentration-gradient-induced perturbations to the equilibrium diffuse double layers. Similarly to diffusiophoresis, the flow may be either up or down the applied concentration gradient. (c) 2006 American Institute of Physics.
引用
收藏
页数:10
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