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Explicitly polarizable soft solvent models for dissipative particle dynamics were examined. Dipole-dipole correlations were found to be significant, impacting dielectric permittivity predictions.

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Area of Science:

  • Computational chemistry
  • Soft matter physics

Background:

  • Dissipative particle dynamics (DPD) models are crucial for simulating soft matter systems.
  • Accurate representation of solvent polarization is essential for reliable DPD simulations.

Purpose of the Study:

  • To critically evaluate explicitly polarizable soft solvent models for DPD.
  • To assess the accuracy of these models in predicting dielectric properties and related phenomena.

Main Methods:

  • Linear response theory with the fluctuating box dipole method was used to calculate dielectric permittivity.
  • Test cases included ion desorption from an oil-water interface and computation of the Kirkwood factor (gK).
  • Dipole-dipole correlation functions were analyzed.

Main Results:

  • The Kirkwood factor (gK) consistently ranged from 0.7 to 0.8, indicating non-negligible dipole-dipole correlations.
  • Onsager theory over-predicted dielectric permittivity by 20%-30% due to these correlations.
  • First-order Wertheim perturbation theory accurately estimated the mean square molecular dipole moment.

Conclusions:

  • Explicitly polarizable soft solvent models exhibit significant dipole-dipole correlations.
  • Standard theories like Onsager's may overestimate dielectric permittivity in these models.
  • Refined theoretical approaches are needed for accurate modeling of polarizable solvents in DPD.