Monte Carlo simulation of the electrical properties of electrolytes adsorbed in charged slit-systems

TL;DR

This paper uses grand canonical Monte Carlo simulations to analyze the electrical properties of electrolytes adsorbed in charged slit-systems, revealing how potential differences and polarization effects influence ion behavior.

Contribution

It introduces a comprehensive simulation approach for studying electrical properties of electrolytes in slit systems, highlighting the importance of including bulk phases in the model.

Findings

Potential difference mainly due to double layers at boundaries

Polarization of external slits affects potential drop

Electrical work to insert ions depends on combined slit and bulk simulation

Abstract

We study the adsorption of primitive model electrolytes into a layered slit system using grand canonical Monte Carlo simulations. The slit system contains a series of charged membranes. The ions are forbidden from the membranes, while they are allowed to be adsorbed into the slits between the membranes. We focus on the electrical properties of the slit system. We show concentration, charge, electric field, and electrical potential profiles. We show that the potential difference between the slit system and the bulk phase is mainly due to the double layers formed at the boundaries of the slit system, but polarization of external slits also contributes to the potential drop. We demonstrate that the electrical work necessary to bring an ion into the slit system can be studied only if we simulate the slit together with the bulk phases in one single simulation cell.