Kosińska I D
M. Smoluchowski Institute of Physics, Jagiellonian University, Reymonta 4, PL-30-059 Kraków, Poland.
J Chem Phys. 2006 Jun 28;124(24):244707. doi: 10.1063/1.2212394.
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 [P. Yu. Apel et al., Nucl. Instrum. Methods Phys. Res. B 184, 337 (2001); Z. Siwy et al., Europhys. Lett. 60, 349 (2002)]. 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 diodelike 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.
生物和合成纳米通道中的离子传输具有离子电流波动、整流和泵送等现象。最近的研究表明，就其传输特性而言，纳米制造的合成孔可以被视为类似于生物通道[P. Yu. Apel等人，《核仪器与方法：物理研究B》184, 337 (2001); Z. Siwy等人，《欧洲物理快报》60, 349 (2002)]。对离子电流整流进行了分析。通过圆柱形纳米孔的离子传输由斯莫卢霍夫斯基方程描述。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呈现出二极管状的I-V特性形状。结果表明，这一特性可能是由不对称程度与内部电势阱深度之间的耦合引起的。讨论了浓度梯度的作用。
