Lozada-Cassou Marcelo, González-Tovar Enrique
Programa de Simulación Molecular, Instituto Mexicano del Petróleo, Eje Central Lázaro Cárdenas 152, México, D.F., 07730, México
J Colloid Interface Sci. 2001 Jul 15;239(2):285-295. doi: 10.1006/jcis.2001.7680.
The electrophoresis of a spherical macroion is calculated with the new primitive model electrophoresis (PME) theory, which incorporates the ionic size. The results are compared with the classical theory of Wiersema, O'Brien, and White. The PME mobility, as a function of the macroion's surface charge (sigma) or zeta potential (zeta), is found to depend on the ionic valence, radius and concentration, and macroion hydrodynamical radius (A); i.e., it is not universal with kappaA, as predicted by the classical theory. The mobility is very nonlinear as a function of zeta. This behavior is related to the nonlinear dependence of zeta, as a function of sigma, when ionic size is included in the theory. In the classical theory zeta is a monotonic function of sigma. Important quantitative and/or qualitative differences between PME and the classical theory are found. However, in the limit of zero ionic diameter, and/or low salt concentration, and low macroion charge, the new theory reduces to the classical theory. The agreement of the PME with experimental data is very good. In particular, the prediction of reversed mobility is corroborated by recent experimental data. Copyright 2001 Academic Press.
利用新的原始模型电泳（PME）理论计算了球形大离子的电泳，该理论考虑了离子大小。将结果与Wiersema、O'Brien和White的经典理论进行了比较。发现PME迁移率作为大离子表面电荷（σ）或ζ电位（ζ）的函数，取决于离子价、半径和浓度以及大离子流体动力学半径（A）；即，它不像经典理论所预测的那样与κA通用。迁移率作为ζ的函数非常非线性。这种行为与当理论中包含离子大小时ζ作为σ的函数的非线性依赖性有关。在经典理论中，ζ是σ的单调函数。发现PME与经典理论之间存在重要的定量和/或定性差异。然而，在离子直径为零、和/或低盐浓度以及低大离子电荷的极限情况下，新理论简化为经典理论。PME与实验数据的吻合度非常好。特别是，最近的实验数据证实了反向迁移率的预测。版权所有2001年学术出版社。
