Mobility reversal of polyelectrolyte-grafted colloids in monovalent salt solutions.
Mobility reversal of polyelectrolyte-grafted colloids in monovalent salt solutions.
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一价盐溶液中聚电解质接枝胶体的迁移逆转
DOI：
10.1103/physrevlett.113.238301
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发表时间：
2014
影响因子：
8.6
通讯作者：
C. Holm
中科院分区：
文献类型：
--
作者：
S. Raafatnia;O. A. Hickey;C. Holm
我们提出了分子动力学模拟与正聚电解质接枝的负胶体的电泳。净中性胶体在一价盐中表现出不同的迁移率。对于具有负净电荷的胶体，迁移率在低盐浓度下为负，在高盐浓度下为正。这种迁移率反转是一种电动效应，因此与在多价盐中观察到的不同。我们的研究结果与基于Darcy-Brinkman形式主义的数值计算相一致，我们预测流动性反转也会发生在实验可访问的胶体中。
We present molecular dynamics simulations on the electrophoresis of a negative colloid grafted with positive polyelectrolytes. Net-neutral colloids show a varying mobility in monovalent salt. For colloids with negative net charge the mobility is negative at low and positive at high salt concentrations. This mobility reversal is an electrokinetic effect, and thus different from that observed in multivalent salt. Our results agree with numerical calculations based on the Darcy-Brinkman formalism, with which we predict the mobility reversal to also occur for experimentally accessible colloids.