电选通会聚-发散纳米通道中异质表面电荷和流型的调制
Modulation of heterogeneous surface charge and flow pattern in electrically gated converging-diverging nanochannel
摘要：
本研究旨在利用场效应现象来诱导异质表面电荷，从而改变具有收敛-发散周期性的固态纳米通道中的流体流动。结果表明，所提出的几何形状导致不均匀的径向场相邻的通道壁，这是较强的周围的发散部分和较弱的收敛部分的壁。后者取决于所施加的栅极电势在沟道壁处产生异质表面电荷，即，施加低栅极电势使得能够有效地调制具有与沟道壁处的本征电荷相同极性的表面电荷，而中等栅极电势导致沟道的发散部分中的电荷反转并产生反向流动，从而导致流体流动循环。流动循环的捕集和拒绝的颗粒的潜在应用也被证明。
英文摘要：
The present study aims at utilizing field effect phenomenon to induce heterogeneous surface charge and consequently changing the fluid flow in a solid state nanochannel with converging-diverging periodicity. It is shown that the proposed geometry causes non-uniform radial field adjacent to channel walls which is stronger around the diverging section and weaker next to the converging part of the wall. The later generates heterogeneous surface charge at channel walls depending on the applied gate potential i.e. applying low gate potential enables effective modulation of surface charge with the same polarity of the intrinsic charge at channel walls, while moderate gate potential causes charge inversion in diverging sections of the channel and generates reverse flow and thus results in fluid flow circulation. The potential application of flow circulation for trapping and rejection of particles is also demonstrated.
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