Nonlinear dielectric effect of dipolar fluids

TL;DR

This paper investigates the nonlinear dielectric response of dipolar fluids using the mean spherical approximation, comparing theoretical predictions with Monte Carlo simulations and classical models, revealing normal saturation effects.

Contribution

It provides an analytical study of the nonlinear dielectric effect in dipolar fluids within MSA and validates results against Monte Carlo simulations and classical theories.

Findings

MSA predicts normal saturation effects in dielectric response.

Monte Carlo simulations confirm the theoretical predictions.

Comparison with Langevin and Debye-Weiss models highlights differences.

Abstract

The nonlinear dielectric effect for dipolar fluids is studied within the framework of the mean spherical approximation (MSA) of hard core dipolar Yukawa fluids. Based on earlier results for the electric field dependence of the polarization our analytical results show so-called normal saturation effects which are in good agreement with corresponding NVT ensemble Monte Carlo simulation data. The linear and the nonlinear dielectric permittivities obtained from MC simulations are determined from the fluctuations of the total dipole moment of the system in the absence of an applied electric field. We compare the MSA based theoretical results with the corresponding Langevin and Debye-Weiss behaviors.