内电势的不对称性如何影响纳米通道的I-V特征的形状
How the asymmetry of internal potential influences the shape of I-V characteristic of nanochannels
摘要：
生物和合成纳米通道中的离子传输的特征在于诸如离子电流波动、整流和泵送等现象。最近，它已被证明，纳米制造的合成孔可以被认为是类似于生物通道方面的运输特性\cite{Apel, Siwy}。分析了离子流整流技术。通过圆柱形纳米孔的离子传输由Smoluchowski方程描述。该模型考虑了具有不对称电荷分布的对称纳米孔。在该模型中，不对称带电纳米通道中的电流整流表现出类似二极管的形状的$I-V$特性。结果表明，这一特性可能是由非对称度与内电势阱深度的耦合作用引起的。讨论了浓度梯度的作用。
英文摘要：
Ion transport in biological and synthetic nanochannels is characterized by such phenomena as ion current fluctuations, rectification, and pumping. Recently, it has been shown that the nanofabricated synthetic pores could be considered as analogous to biological channels with respect to their transport characteristics \cite{Apel, Siwy}. The ion current rectification is analyzed. Ion transport through cylindrical nanopores is described by the Smoluchowski equation. The model is considering the symmetric nanopore with asymmetric charge distribution. In this model, the current rectification in asymmetrically charged nanochannels shows a diode-like shape of $I-V$ characteristic. It is shown that this feature may be induced by the coupling between the degree of asymmetry and the depth of internal electric potential well. The role of concentration gradient is discussed.
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