论文标题
离子在疏水纳米管中的运输
Transport of ions in hydrophobic nanotubes
论文作者
论文摘要
重新审视了固定表面电荷密度的圆柱通道中电动离子传输的理论。注意力集中在吸附表面电荷的疏水滑倒和迁移率的影响上。我们为任意半径的圆柱体制定了广义的Onsager关系，然后为平均电渗透迁移率和电导率提供精确表达式。为了采用这些表达式，我们执行其他静电计算，特别关注非线性静电效应。我们的理论通过强调适当的静电和流体动力长度尺度及其比例的作用，简单地解释了疏水纳米管的巨大增强和疏水性纳米管的电导率的简单解释。我们还提出了对圆柱通道的Zeta电位的新解释。
The theory of electrokinetic ion transport in cylindrical channels of a fixed surface charge density is revisited. Attention is focused on impact of the hydrophobic slippage and mobility of adsorbed surface charges. We formulate generalised Onsager relations for a cylinder of an arbitrary radius and then derive exact expressions for the mean electro-osmotic mobility and conductivity. To employ these expressions we perform additional electrostatic calculations, with the special focus on the non-linear electrostatic effects. Our theory provides a simple explanation of a giant enhancement of the electrokinetic mobility and conductivity of hydrophobic nanotubes by highlighting the role of appropriate electrostatic and hydrodynamic length scales and their ratios. We also propose a novel interpretation of zeta potentials of cylindrical channels.
