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Allison A Peroutka1, G Brian Stephenson2, Michael J Servis1

  • 1Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 S Cass Ave, Lemont, Illinois 60439, United States.

Journal of Chemical Information and Modeling
|May 29, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces KBKit, a Python package that simplifies calculating thermodynamic properties from molecular simulations using Kirkwood-Buff theory. It automates corrections for finite-volume effects, making complex analysis accessible for researchers.

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Area of Science:

  • Computational chemistry and materials science.
  • Statistical mechanics and thermodynamics.
  • Software development for scientific research.

Background:

  • Accurate thermodynamic properties of liquid mixtures are crucial for applications like drug delivery and energy storage.
  • Extracting these properties from molecular simulations is challenging due to finite-volume effects.
  • Kirkwood-Buff (KB) theory provides a rigorous link between microscopic and macroscopic properties but requires specialized corrections for simulation data.

Purpose of the Study:

  • To develop an open-source Python package, KBKit, for applying finite-volume corrections to Kirkwood-Buff theory.
  • To enable accurate calculation of thermodynamic properties from molecular dynamics simulations.
  • To streamline the workflow for researchers using KB theory.

Main Methods:

  • KBKit applies sequential finite-volume corrections (Ganguly, Krüger, Dawass) to radial distribution functions (RDFs) from molecular dynamics simulations.
  • The package utilizes GROMACS output files as input.
  • Built-in convergence diagnostics assess the quality of Kirkwood-Buff integrals (KBIs).

Main Results:

  • KBKit automatically computes KBIs and derived thermodynamic quantities like activity coefficients and excess Gibbs energy.
  • The software supports multicomponent and electrolyte systems.
  • It successfully condenses a complex analysis workflow into intuitive commands.

Conclusions:

  • KBKit simplifies the application of Kirkwood-Buff theory for characterizing solution-phase thermodynamics.
  • The package enhances the reliability and accessibility of thermodynamic property calculations from simulations.
  • It facilitates the integration of KB theory into routine research workflows.