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Hybrid particle-field molecular dynamics under constant pressure.

Sigbjørn Løland Bore1, Hima Bindu Kolli1, Antonio De Nicola2

  • 1Department of Chemistry, and Hylleraas Centre for Quantum Molecular Sciences, University of Oslo, P.O. Box 1033, Blindern, 0315 Oslo, Norway.

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Summary

This study introduces a new method for hybrid particle-field simulations, enabling modeling of soft matter at constant external pressure. This advance accurately captures equation of state and surface phenomena in complex systems.

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Area of Science:

  • Computational physics
  • Soft matter physics
  • Molecular dynamics

Background:

  • Hybrid particle-field methods are efficient for soft matter but limited to constant volume.
  • Modeling soft matter under constant pressure is crucial for understanding many physical phenomena.

Purpose of the Study:

  • To reformulate particle-field interactions for systems under constant external pressure.
  • To extend hybrid particle-field methods to include pressure tensor contributions, both isotropic and non-isotropic.

Main Methods:

  • Modification of the particle-field energy functional to model isotropic pressure tensor contributions.
  • Inclusion of a square gradient particle-field interaction term for non-isotropic pressure contributions.
  • Implementation within the hybrid particle-field molecular dynamics framework.

Main Results:

  • Demonstrated accurate parameterization of the equation of state for water under varying external pressures.
  • Showcased transferability of parameterization across systems with similar coarse-grained resolutions.
  • Successfully reproduced experimental area per lipid and lateral pressure profiles for phospholipid models.

Conclusions:

  • The developed hybrid particle-field approach effectively models soft matter systems at constant external pressure.
  • The method accurately captures equation of state, surface tension phenomena, and lipid behavior.
  • This offers a computationally efficient tool for simulating complex soft matter systems under realistic pressure conditions.