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This study presents a new method for determining simulation parameters in dissipative particle dynamics (DPD) using Hansen solubility parameters. This approach accurately predicts interfacial tension and surfactant behavior in various water-oil systems.

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Area of Science:

  • Computational chemistry
  • Materials science
  • Soft matter physics

Background:

  • Coarse-grained simulations, particularly dissipative particle dynamics (DPD), are sensitive to inter-species repulsive parameters.
  • Existing methods for parameter determination vary, impacting simulation accuracy for experimental properties.

Purpose of the Study:

  • To systematically investigate and compare procedures for estimating DPD simulation parameters.
  • To develop a reliable method for parameter determination that accurately reproduces experimental interfacial tension and other system properties.

Main Methods:

  • Comparison of parameter estimation methods based on Hildebrand and Hansen solubility parameter theories, integrated with the Flory-Huggins model.
  • Application and validation of the Hansen solubility parameter approach for water/oil systems, including water/benzene, water/n-octane, and others.
  • Simulation of interfacial tension and micellar properties using derived DPD parameters.

Main Results:

  • The Hansen solubility parameter approach enables high coarse-graining and yields realistic interfacial tension values.
  • Experimental interfacial tension was accurately reproduced for multiple water/oil systems with a single correction factor.
  • DPD parameters derived using this method successfully described both interfacial tension and micellar behavior of nonionic surfactants in water.

Conclusions:

  • The Hansen solubility parameter-based method provides a robust framework for parameterizing DPD simulations.
  • This approach facilitates accurate modeling of water/oil interfaces and surfactant aggregation phenomena.
  • The study demonstrates the utility of DPD for simulating complex interfacial systems with varying surfactant concentrations.