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Accurate treatment of long-range dispersion forces is crucial for fluid simulations. This study found minimal differences in surface tension for water models when comparing full dispersion potentials with cutoff versions.

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Area of Science:

  • Computational physics
  • Materials science
  • Physical chemistry

Background:

  • Long-range dispersion forces significantly influence inhomogeneous fluid properties.
  • Ignoring these forces or using cutoff potentials can introduce simulation artifacts.
  • Accurate modeling is essential for reliable predictions of material behavior.

Purpose of the Study:

  • To analyze the impact of long-range dispersion forces on interfacial properties of water models.
  • To compare simulation results using full dispersion potentials versus cutoff potentials.
  • To quantify differences in surface tension estimates.

Main Methods:

  • Simulation of seven popular water models.
  • Comparison of interfacial properties using full dispersion potentials and cutoff dispersion potentials.
  • Analysis of surface tension and other interfacial characteristics.

Main Results:

  • Differences in surface tension estimates between full and cutoff dispersion potentials were consistently small (less than 2 mN/m) across all tested water models.
  • The study quantified the impact of long-range dispersion on specific interfacial properties.
  • Structural changes induced by long-range forces were implicitly considered through the comparison.

Conclusions:

  • The impact of long-range dispersion forces on the surface tension of common water models is minor.
  • Using cutoff potentials for dispersion may be acceptable for surface tension calculations in these specific cases.
  • Further investigation into other interfacial properties and fluid systems is warranted.