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Related Experiment Video

Updated: Sep 27, 2025

A Method for Determination and Simulation of Permeability and Diffusion in a 3D Tissue Model in a Membrane Insert System for Multi-well Plates
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Widom insertion method in simulations with Ewald summation.

Amin Bakhshandeh1, Yan Levin1

  • 1Instituto de Física, Universidade Federal do Rio Grande do Sul, Caixa Postal 15051, CEP 91501-970 Porto Alegre, RS, Brazil.

The Journal of Chemical Physics
|April 9, 2022
PubMed
Summary
This summary is machine-generated.

The Widom insertion method accurately calculates ion chemical potential in simulations. A modified approach using a neutralizing background improves agreement with grand canonical Monte Carlo simulations for ionic clusters.

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Area of Science:

  • Computational Chemistry
  • Physical Chemistry
  • Materials Science

Background:

  • Calculating the chemical potential of individual ions is crucial for understanding electrolyte solutions and ionic materials.
  • The Widom insertion method is a common technique for determining chemical potentials in simulations.
  • Ewald summation is a standard method for handling long-range electrostatic interactions in periodic systems.

Purpose of the Study:

  • To evaluate the Widom insertion method for calculating individual ion chemical potentials in computer simulations.
  • To compare two distinct approaches for applying the Widom insertion method in the context of Ewald summation.
  • To assess the accuracy of these approaches against established simulation techniques.

Main Methods:

  • Application of the Widom insertion method with Ewald summation.
  • Implementation of two distinct insertion strategies: (1) insertion into a charge-neutral system, and (2) insertion into a system requiring a neutralizing background.
  • Comparison with grand canonical Monte Carlo (GCMC) simulations.

Main Results:

  • The second approach, involving a neutralizing background to maintain charge neutrality after ion insertion, showed superior performance.
  • This modified Widom insertion method achieved better agreement with GCMC simulation results for the total chemical potential of neutral ionic clusters.
  • The standard Widom insertion into a charge-neutral system exhibited less favorable agreement.

Conclusions:

  • The Widom insertion method, particularly when adapted with a neutralizing background, is a viable and accurate technique for determining individual ion chemical potentials.
  • This refined simulation approach enhances the reliability of computational studies on electrolyte solutions and ionic systems.
  • The findings provide a more accurate computational tool for predicting the behavior of ions in solution.