Interionic interactions in conducting nanoconfinement.
Interionic interactions in conducting nanoconfinement.
复制标题
进行纳米限制中的离子间相互作用。
作者：
C. Rochester;A. Lee;G. Pruessner;A. Kornyshev
导电纳米孔中的离子间相互作用决定了在外加电压作用下，反离子如何在孔中堆积。在理想金属中，相互作用被金属电子以指数方式屏蔽。然而，现代纳米孔电极主要由碳材料制成。这种屏蔽在多大程度上受到这种材料中不同模式的介电响应的影响？为了回答这个问题，我们研究了允许有限电场穿透孔壁的圆柱形孔和狭缝孔中电荷的库仑相互作用，以及由非局部介电函数模拟的两个石墨烯薄壁之间纳米间隙中的库仑相互作用。在所研究的所有情况下，发现筛选与金属纳米孔略有不同，但仍然足够强大，以支持在这种孔中实现所谓的超离子状态。
Interionic interactions in conducting nanopores determine how counterions may be packed in the pores subject to the applied voltage. In ideal metals, interactions are exponentially screened by metallic electrons. However, modern nanoporous electrodes are predominantly made of carbon materials. To what extent is this screening affected by a different mode of dielectric response in such materials? To answer this question we study Coulomb interaction of charges in cylindrical and slit pores that allow finite electric field penetration into the pore walls, as well as the Coulomb interaction in a nanogap between two thin walls of graphene modeled by a non-local dielectric function. In all cases studied the screening was found to be subtly different than in metallic nanopores, but still strong enough to support realization of the so called superionic state in such pores.