Effect of Image Forces on Polyelectrolyte Adsorption at a Charged Surface

TL;DR

This study uses Monte Carlo simulations to explore how image forces affect the adsorption behavior of charged polyelectrolytes on surfaces, revealing that image forces significantly reduce adsorption and prevent charge inversion.

Contribution

It provides a detailed analysis of the impact of dielectric discontinuity and chain length on polyelectrolyte adsorption, highlighting the role of image forces in surface interactions.

Findings

Image forces reduce polyelectrolyte adsorption.

Image forces inhibit substrate charge inversion.

Structural charge distributions are affected by dielectric effects.

Abstract

The adsorption of flexible and highly charged polyelectrolytes onto oppositely charged planar surfaces is investigated by means of Monte Carlo simulations. The effect of image forces stemming from the dielectric discontinuity at the substrate interface is considered. The influence, at fixed polyelectrolyte volume fraction, of chain length and surface-charge density is also considered. A detailed structural study, including monomer and fluid charge distributions, is provided. It is demonstrated that image forces can considerably reduce the degree of polyelectrolyte adsorption and concomitantly inhibit the charge inversion of the substrate by polyelectrolytes.