论文标题
溶剂极化对电解质溶液中带电软表面的电力双层的影响
Effect of solvent polarization on electric double layer of a charged soft surface in an electrolyte solution
论文作者
论文摘要
我们通过使用平均场方法（包括不均匀的尺寸效应和溶剂极化）来研究带电软表面附近的电动双层。基于自由能模型，通过求解包括泊松方程在内的耦合微分方程来获得水和离子的数量密度。我们发现，溶剂极化会显着影响静电电位，离子数密度和电解质溶液靠近带电软表面的介电常数。我们证明对溶剂极化的考虑增加了唐南电位的幅度。我们还证明，在固定电荷层中，相反的数量密度比不考虑溶剂极化时稍小。离子大小的增加增强了溶剂极化对带电软表面固定带电层内静电性能的影响。在高表面电荷密度的区域中，由于水极化而导致的水偶极子的介电性和数量密度大大降低。
We study the electric double layer near a charged soft surface by using a mean-field approach including non-uniform size effect and solvent polarization. Based on a free energy model, electrostatic potential and number densities of water and ions are obtained numerically by solving coupled differential equations including the Poisson's equation. We find that the solvent polarization significantly affects electrostatic potential, ion number densities and permittivity in an electrolyte solution near a charged soft surface. We prove that the consideration of the solvent polarization increases the magnitude of Donnan potential. We also demonstrate that within the fixed charge layer the number densities of counterions and coions are slightly smaller than when the solvent polarization is not considered. An increase in the ionic size enhances the influence of solvent polarization on the electrostatic properties within the fixed charged layer of charged soft surface. In the region of high surface-charge-density, the permittivity and the number density of water dipoles considerably decrease due to water polarization.
