Hydrodynamic flow in the vicinity of a nanopore induced by an applied voltage.
Hydrodynamic flow in the vicinity of a nanopore induced by an applied voltage.
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DOI：
10.1088/0957-4484/24/24/245202
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发表时间：
2013-06-21
期刊：
影响因子：
3.5
通讯作者：
Hu G
中科院分区：
文献类型：
--
作者：
Mao M;Ghosal S;Hu G
采用连续体模拟来研究在施加电势降的情况下通过固态膜中的纳米孔的离子传输和流体流动。结果表明膜表面存在浓差极化层。离子分布的不均匀性会产生驱动流体中旋涡运动的电压。由于膜表面电荷引起的不对称性，还存在通过纳米孔的净流体动力流。定性行为与之前使用分子动力学模拟的研究中观察到的类似。电流-电压特性表现出一些非线性特征，但在所研究的参数范围内并没有受到水动力流动的太大影响。在薄德拜层的限制下，系统的电阻可以使用具有集总参数的等效电路来表征。从麦克斯韦应力的基本考虑可以定性地理解涡量的产生。然而，流动强度是应用场的强非线性函数。电泳和流体动力学效应的结合可以导致离子价态选择性，这可能在分离中具有一些实际应用。
Continuum simulation is employed to study ion transport and fluid flow through a nanopore in a solid-state membrane under an applied potential drop. Results show the existence of concentration polarization layers on the surfaces of the membrane. The nonuniformity of the ionic distribution gives rise to an electric pressure that drives vortical motion in the fluid. There is also a net hydrodynamic flow through the nanopore due to an asymmetry induced by the membrane surface charge. The qualitative behavior is similar to that observed in a previous study using molecular dynamic simulations. The current–voltage characteristics show some nonlinear features but are not greatly affected by the hydrodynamic flow in the parameter regime studied. In the limit of thin Debye layers, the electric resistance of the system can be characterized using an equivalent circuit with lumped parameters. Generation of vorticity can be understood qualitatively from elementary considerations of the Maxwell stresses. However, the flow strength is a strongly nonlinear function of the applied field. Combination of electrophoretic and hydrodynamic effects can lead to ion selectivity in terms of valences and this could have some practical applications in separations.
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