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The effects of the electrical double layer on giant ionic currents through single-walled carbon nanotubes

机译：双电层对通过单壁碳纳米管的巨大离子流的影响

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We developed a computational model for investigating the cause for the high ionic current through a single-walled carbon nanotube nanofluidic device by considering the electrical double layer at a solid-liquid interface. With this model, we were able to examine the influence of the Gouy-Chapman-Stern electrical double layer and the solution concentration on the ionic conductance in the device. Results showed that the conductance-concentration relationship predicted from our model agreed well with experimental observation. Moreover, our model showed that the compact layer thickness increased with the increase of the bulk solution concentration, reducing the internal volume of the nanotube channel available for fluid transport. Fluid within the channel had an enhanced concentration and a net charge which increased the electroosmotic and electrophoretic transport properties of the device, increasing the total ionic conductance of the system.
机译：我们通过考虑固液界面的双电层，开发了一个计算模型，用于研究通过单壁碳纳米管纳米流体器件产生高离子电流的原因。使用此模型，我们能够检查Gouy-Chapman-Stern电双层和溶液浓度对设备中离子电导率的影响。结果表明，由我们的模型预测的电导-浓度关系与实验观察吻合得很好。此外，我们的模型表明，紧密层的厚度随着本体溶液浓度的增加而增加，从而减小了可用于流体传输的纳米管通道的内部体积。通道内的流体具有增强的浓度和净电荷，这增加了设备的电渗和电泳传输特性，从而增加了系统的总离子电导率。

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