论文标题
在电控融合纳米通道中的异质表面电荷和流动模式的调节
Modulation of heterogeneous surface charge and flow pattern in electrically gated converging-diverging nanochannel
论文作者
论文摘要
本研究旨在利用现场效应现象诱导异质表面电荷，从而改变固态纳米渠道中的流体流动，并通过收敛的周期性变化。结果表明，所提出的几何形状会导致与通道壁相邻的不均匀径向场，该通道壁附近，该壁周围更强，并且在壁的收敛部分旁边较弱。后来，根据所施加的门电势在通道壁上产生异质表面电荷，即应用低门电位可以有效调节表面电荷在通道壁上具有相同固有电荷的极性的表面电势，而中等栅极电势导致通道偏差部分的电荷反转并产生反向流动并因此导致流体流动循环。还证明了流动循环在捕获和排斥颗粒中的潜在应用。
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.
