标题： 由表面离子运动引起的增强的ζ电势 显示英文标题

标题： Enhanced zeta potentials caused by surface ion mobilities

摘要： 带电壁面附近的电动力学被重新审视。 重点放在明确的 diffuse Stern 层的影响上，其介电常数和粘度与本体值不同，这对电渗塞流的速度产生影响。 为了解决这个问题，我们提出了一种方法，即将 Stern 层中的流动映射到划分 Stern 层和 diffuse 层的表面，在该表面上施加有效的电动力学滑移边界条件。 后者意味着一个有效的表面电荷响应于外加电场，并由一个迁移率参数 $\mu \geq 1$ 表征。 我们推导出 $\mu$ 的解析方程，并证明它仅由双电层的静电性质决定。 然后利用这些方程计算表面的电动力学（zeta）电位。 我们表明，zeta 电位通常大于表面电位，这意味着电渗流的放大效应。 如果水动力滑移长度较大和/或在浓溶液中，这种效应最为显著。 显示英文摘要

摘要： The electro-hydrodynamics near conducting walls is revisited. Attention is focused on the impact of an explicit diffuse Stern layer, which permittivity and viscosity differ from the bulk values, on the velocity of an electro-osmotic plug flow. To solve this problem we propose an approach of mapping the flow in the Stern layer to the surface dividing the Stern and diffuse layer, where an effective electro-hydrodynamic slip boundary condition is imposed. The latter implies that an effective surface charge is responding to the applied field and characterized by a mobility parameter $\mu \geq 1$. We derive analytic equations for $\mu$ and demonstrate that it is determined only by electrostatic properties of the electric double layer. These equations are then used to calculate electrokinetic (zeta) potentials of surfaces. We show that the zeta potential generally exceeds the surface one, which implies an amplification of the electro-osmotic flow. This effect is most pronounced if the hydrodynamic slip length is large and/or in concentrated solutions.