论文标题
溶剂极化和非均匀离子大小对电解质溶液中带电表面之间静电性能的影响
Influence of solvent polarization and non-uniform ion size on electrostatic properties between charged surfaces in an electrolyte solution
论文作者
论文摘要
在本文中，我们研究了两个相似或相对电荷的表面之间的静电性能，该表面通过使用平均场进近的溶剂偏振和不均匀的大小效应来浸入电解质溶液中。我们将自由能形式主义考虑不平等的离子大小和水偶极子的定向排序，我们得出耦合和自洽方程，以计算带电表面之间的静电性能。带电表面的静电性能取决于对立尺寸，而不取决于COION尺寸。此外，发现类似带电的表面之间的静电电势和渗透压随着柜台尺寸的增加而增加。另一方面，相对电荷表面之间的相应尺寸与正离子和负离子的大小有关。对于相反电荷的表面，静电电位，溶剂分子的数量密度和具有不相等大小不相等的电解质的相对介电常数与带电表面之间的中心线并不对称。对于这两种情况，与该病例相比，对溶剂极化的考虑会导致静电势和渗透压降低。
In this paper, we study electrostatic properties between two similar or oppositely charged surfaces immersed in an electrolyte solution by using mean-field approach accounting for solvent polarization and non-uniform size effect. Applying a free energy formalism accounting for unequal ion sizes and orientational ordering of water dipoles, we derive coupled and self-consistent equations to calculate electrostatic properties between charged surfaces. Electrostatic properties for similarly charged surfaces depend on counterion size but not coion size. Moreover, electrostatic potential and osmotic pressure between similarly charged surfaces are found to be increased with increasing counterion size. On the other hand, the corresponding ones between oppositely charged surfaces are related to both sizes of positive and negative ions. For oppositely charged surfaces, the electrostatic potential, number density of solvent molecules and relative permittivity of an electrolyte having unequal ion sizes are not symmetric about the centerline between the charged surfaces. For either case, the consideration of solvent polarization results in an decrease in the electrostatic potential and the osmotic pressure compared to the case without the effect.
