arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0802.1541cond-mat.softcond-mat.stat-mech
收藏

多分散胞模型:胶体混合物中的非线性屏蔽和电荷重整化

The polydisperse cell model: Non-linear screening and charge renormalization in colloidal mixtures

Aldemar Torres, Gabriel Tellez, Rene van Roij

摘要:

我们提出了一个模型的重正化电荷和高电荷胶体颗粒的混合物的渗透性能的计算。该模型是由Alexander及其合作者(J.Chem.Phys.80,5776(1984))引入的细胞模型和电荷重整化概念的推广。总溶液被分配到与混合物中的组分一样多的不同细胞中。这些细胞的半径确定自相一致的一组给定的参数,从解决方案的非线性泊松-玻尔兹曼方程与适当的边界条件。这推广了亚历山大的模型,其中(唯一的)维格纳-塞茨细胞半径是固定的胶体包装分数。我们通过考虑具有相同电荷符号的胶体的二元混合物来说明该技术。该模型可以在线性理论水平上计算高电荷胶体混合物的热力学性质,同时考虑非线性屏蔽的影响。

英文摘要:

We propose a model for the calculation of renormalized charges and osmotic properties of mixtures of highly charged colloidal particles. The model is a generalization of the cell model and the notion of charge renormalization as introduced by Alexander and his collaborators (J. Chem. Phys. 80, 5776 (1984)). The total solution is partitioned into as many different cells as components in the mixture. The radii of these cells are determined self-consistently for a given set of parameters from the solution of the non-linear Poisson-Boltzmann equation with appropriate boundary conditions. This generalizes Alexanders's model where the (unique) Wigner-Seitz cell radius is fixed solely by the colloids packing fraction. We illustrate the technique by considering a binary mixture of colloids with the same sign of charge. The present model can be used to calculate thermodynamic properties of highly charged colloidal mixtures at the level of linear theories, while taking the effect of non-linear screening into account.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑