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首页> 外文期刊>Nanotechnology >Hydrodynamic flow in the vicinity of a nanopore induced by an applied voltage
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Hydrodynamic flow in the vicinity of a nanopore induced by an applied voltage

机译：施加电压引起的纳米孔附近的流体动力流动

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摘要

Continuum simulation is employed to study ion transport and fluid flow through a nanopore in a solid-state membrane under an applied potential drop. The 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.
机译：连续谱模拟用于研究在施加的电势降下，离子在固体膜中通过纳米孔的传输和流体流动。结果表明在膜表面上存在浓差极化层。离子分布的不均匀会引起驱动流体中涡旋运动的电压。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动。定性行为类似于先前使用分子动力学模拟进行的研究中观察到的行为。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不受流体动力流动的很大影响。在德拜薄层的限制内，可以使用具有集总参数的等效电路来表征系统的电阻。从麦克斯韦应力的基本考虑可以定性地理解涡度的产生。然而，流动强度是所施加场的强烈非线性函数。电泳效应和流体动力学效应的结合可以导致价离子的选择性，这在分离中可能有一些实际应用。

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