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Accelerating Solvent Dynamics with Replica Exchange for Improved Free Energy Sampling.

Robert Darkins1, Dorothy M Duffy1, Ian J Ford1

  • 1Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, U.K.

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|October 21, 2023
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Summary
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Combining Hamiltonian replica exchange (HREX) with well-tempered metadynamics (WTMD) significantly improves molecular simulation accuracy. This enhanced sampling method accelerates the study of solvent dynamics and free energy calculations for surface adsorption processes.

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Area of Science:

  • Computational chemistry
  • Materials science
  • Physical chemistry

Background:

  • Molecular reactions in solution necessitate solvent exchange, impacting adsorption processes.
  • Slow solvent dynamics in simulations hinder accurate free energy estimations.
  • Current methods struggle to adequately sample solvent configurations during simulations.

Purpose of the Study:

  • To accelerate the sampling of solvent configurations orthogonal to collective variables in molecular simulations.
  • To improve the accuracy of free energy calculations for interfacial phenomena.
  • To investigate the formation free energy of a carbonate vacancy at the calcite-water interface.

Main Methods:

  • Integration of Hamiltonian replica exchange (HREX) with well-tempered metadynamics (WTMD).
  • Application of the combined HREX-WTMD approach to simulate the calcite-water interface.
  • Calculation of the formation free energy of a carbonate vacancy.

Main Results:

  • The combined WTMD and HREX approach significantly enhanced solvent configuration sampling.
  • Improved sampling led to more accurate free energy estimates for the vacancy formation.
  • The method demonstrated superior performance compared to WTMD alone.

Conclusions:

  • The synergistic combination of HREX and WTMD is effective for accelerating simulations of solvent dynamics.
  • This enhanced sampling strategy improves the accuracy of free energy calculations in complex interfaces.
  • The developed method offers a powerful tool for studying molecular adsorption and interfacial reactions.