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首页> 外文期刊>Applied Mathematical Modelling >Effect of hydrophobic patch on the modulation of electroosmotic flow and ion selectivity through nanochannel
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Effect of hydrophobic patch on the modulation of electroosmotic flow and ion selectivity through nanochannel

机译：疏水贴剂对纳米通道的电渗流和离子选择性调节的影响

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In this article we made a systematic study of the electrokinetically driven flow through a long nanochannel patterned with charged hydrophobic patch embedded along the walls. The hydrophobic patch possess either similar or opposite charge to that of the hydrophilic portion of the channel wall. The hydrodynamic slip length is considered to be a function of the surface charge distributed along the patch. We consider the aqueous medium as binary symmetric electrolyte solution with constant property Newtonian fluid. We adopt a nonlinear model based on the Poisson-Nernst-Planck equations coupled with Navier-Stokes equations. The coupled set of governing equations are solved using a finite volume method. We use a higher order upwind based total variation diminishing (TVD) scheme to discretize the convective and electromigration terms (i.e., hyperbolic terms) and the central difference scheme is used to discretize the diffusion term. We have identified several interesting key features of the modulation of electroosmotic flow (EOF) through such a nanochannel. An enhancement or a reduction in average flow rate may be achieved depending on the polarity of the charges distributed along the hydrophobic or hydrophilic portion of the channel wall. We have also shown that the reversal in EOF may occur depending on the critical choice of the pertinent parameters. We have further studied the selectivity of mobile ions by regulating the charge properties of the channel walls.
机译：在本文中，我们通过用沿着墙壁嵌入的带电疏水贴片图案化的长纳米通道进行电动驱动的流动进行系统研究。疏水贴片具有相似或相反的电荷与通道壁的亲水部分的电荷相似。流体动力滑动长度被认为是沿贴片分布的表面电荷的函数。我们认为含水介质作为二元对称电解质溶液，具有恒定的牛顿液。我们采用基于泊松 - 内部普通方程的非线性模型，耦合与Navier-Stokes方程。使用有限体积法解决了一组控制方程。我们使用基于更高阶的upwind总变化递减（TVD）方案，以使对流和电迁移项（即，双曲线术语）和中央差分方案用于离散术语来离散化。我们已经通过这种纳米通道确定了电渗流量（EOF）的几个有趣的关键特征。可以根据沿着通道壁的疏水或亲水部分分布的电荷的极性来实现平均流速的增强或降低。我们还表明，可以根据相关参数的关键选择可能发生eof中的逆转。我们通过调节通道壁的电荷特性，我们进一步研究了移动离子的选择性。

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