固定电荷存在下离子通过受限离子通道的输运
Ion transport through confined ion channels in the presence of immobile charges
摘要：
我们研究了在外加电场和固定背景电荷存在下，在受限的纳米尺度几何结构中的离子溶液中的电荷输运。对于一系列参数，离子电流显示非单调行为作为外部离子浓度的函数。在外加电场较小的情况下，离子输运可以从简单的解析式得到理解，并得到了蒙特卡罗模拟的支持。结果定性地解释了在最近的一项关于通过DNA螺纹纳米孔的离子传输的实验中观察到的离子电流的测量结果（D。J. Bonthuis et.例如，，vol.97，128104（2006））。
英文摘要：
We study charge transport in an ionic solution in a confined nanoscale geometry in the presence of an externally applied electric field and immobile background charges. For a range of parameters, the ion current shows non-monotonic behavior as a function of the external ion concentration. For small applied electric field, the ion transport can be understood from simple analytic arguments, which are supported by Monte Carlo simulation. The results qualitatively explain measurements of ion current seen in a recent experiment on ion transport through a DNA-threaded nanopore (D. J. Bonthuis et. al., Phys. Rev. Lett, vol. 97, 128104 (2006)).
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