Ohshima H
Faculty of Pharmaceutical Sciences and Institute of Colloid and Interface Science, Science University of Tokyo, 12 Ichigaya Funagawara-machi, Shinjuku-ku, Tokyo, 162-0826, Japan
J Colloid Interface Sci. 2000 May 1;225(1):233-242. doi: 10.1006/jcis.2000.6759.
A general theory is developed for the electrophoretic mobility of spherical soft particles (i.e., spherical hard colloidal particles of radius a coated with a layer of polyelectrolytes of thickness d) in concentrated suspensions in an electrolyte solution as a function of the particle volume fraction φ on the basis of Kuwabara's cell model. In the limit d-->0, the mobility expression obtained tends to that for spherical hard particles in concentrated suspensions, whereas in the limit a-->0, it becomes that for spherical polyelectrolytes (charged porous spheres with no particle core). Simple approximate analytic mobility expressions are derived for the case where relaxation effect is negligible. It is found that in practical cases, the φ dependence of the mobility is negligible for d<<a, whereas for d>>a, the mobility strongly decreases with increasing φ. Copyright 2000 Academic Press.
基于桑原的胞元模型，针对电解质溶液中浓悬浮液里的球形软颗粒（即半径为a的球形硬胶体颗粒，表面包覆一层厚度为d的聚电解质）的电泳迁移率，推导出了一个通用理论，该理论是颗粒体积分数φ的函数。在d→0的极限情况下，所得到的迁移率表达式趋近于浓悬浮液中球形硬颗粒的迁移率表达式；而在a→0的极限情况下，它则变为球形聚电解质（无颗粒核心的带电多孔球体）的迁移率表达式。对于弛豫效应可忽略不计的情况，推导出了简单的近似解析迁移率表达式。结果发现，在实际情况中，当d << a时，迁移率对φ的依赖性可忽略不计；而当d >> a时，迁移率会随着φ的增加而大幅降低。版权所有2000年学术出版社。
