Gan Zecheng, Xu Zhenli
Department of Mathematics, Shanghai Jiao Tong University, Shanghai, China.
Phys Rev E Stat Nonlin Soft Matter Phys. 2011 Jul;84(1 Pt 2):016705. doi: 10.1103/PhysRevE.84.016705. Epub 2011 Jul 18.
The polarization-induced charges of a dielectric sphere are studied for charged colloidal systems in electrolyte solutions with a primitive model. The method of constructing multiple-image charges is used to approximate the polarization potential of a microion outside the sphere; it is based on a numerical discretization of the potential's analytical integral representation, and can systematically approximate the exact potential with desired accuracy by varyiation of the number of point images. Different aspects of the image effects are then investigated by Monte Carlo simulations for several colloidal systems, in both salt-free and salty environments. Furthermore, we studied the influence of discrete surface charges of different valences, and demonstrate that the polarization charges can significantly strengthen charge reversal for the colloid-microion complex, especially for multivalent interfacial ions.
利用原始模型研究了电解质溶液中带电胶体系统中介质球体的极化感应电荷。构建多重镜像电荷的方法用于近似球体外部微离子的极化势；它基于势的解析积分表示的数值离散化，并且可以通过改变点镜像的数量以所需精度系统地近似精确势。然后通过蒙特卡罗模拟研究了几种胶体系统在无盐和含盐环境中镜像效应的不同方面。此外，我们研究了不同价态的离散表面电荷的影响，并证明极化电荷可以显著增强胶体 - 微离子复合物的电荷反转，特别是对于多价界面离子。
