Electric-field-induced stretching of surface-tethered polyelectrolytes in a microchannel.
Electric-field-induced stretching of surface-tethered polyelectrolytes in a microchannel.
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微通道中表面束缚聚电解质的电场诱导拉伸
DOI：
10.1103/physreve.96.032503
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Steffen Hardt
中科院分区：
文献类型：
--
作者：
Tamal Roy;Kai Szuttor;Jens Smiatek;Christian Holm;Steffen Hardt
我们研究了在直流电场作用下，限制在平行表面之间的表面系留聚电解质的拉伸行为。通过单分子实验和粗粒耦合格子-玻尔兹曼分子动力学模拟，探讨了电场强度、聚电解质长度和限制程度对聚电解质构象的影响。发现聚电解质的分数伸长率是外加电场和分子轮廓长度乘积的普适函数，这可以用简单的标度论证来解释。约束程度对拉伸没有任何显著影响。我们还证实了将电场中的伸展与流场中的伸展联系起来的电流体等效原理是适用的。
We study the stretching of a surface-tethered polyelectrolyte confined between parallel surfaces under the application of a dc electric field. We explore the influence of the electric-field strength, the length of the polyelectrolyte, and the degree of confinement on the conformation of the polyelectrolyte by single-molecule experiments and coarse-grained coupled lattice-Boltzmann molecular-dynamics simulations. The fractional extension of the polyelectrolyte is found to be a universal function of the product of the applied electric field and the molecular contour length, which is explained by simple scaling arguments. The degree of confinement does not have any significant influence on the stretching. We also confirm that an electrohydrodynamic equivalence principle relating the stretching in an electric field to that in a flow field is applicable.