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Resolving Discrepancies in Disjoining Pressure Predictions for Liquid Nanofilms from Molecular Simulations.

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Discrepancies in liquid nanofilm disjoining pressure simulations stem from ignoring dispersion forces and inconsistent thickness definitions. A revised method accounting for these factors yields accurate Hamaker constants.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Computational Physics

Background:

  • Disjoining pressure in liquid nanofilms is crucial for understanding film stability.
  • Existing molecular simulation methods exhibit significant discrepancies in disjoining pressure values.
  • These discrepancies are often attributed to approximations in handling intermolecular forces and film geometry.

Purpose of the Study:

  • To identify the sources of discrepancies in literature values of disjoining pressure for liquid nanofilms.
  • To develop a revised simulation method that accurately incorporates long-range dispersion interactions and consistent film thickness definitions.
  • To improve the accuracy of calculated Hamaker constants for nanofilms.

Main Methods:

  • Analysis of literature data from various molecular simulation techniques.
  • Implementation of a revised Peng method incorporating long-range dispersion interactions.
  • Consistent definition of film thickness in molecular simulations.
  • Comparison of simulation results with the Bhatt method.

Main Results:

  • Neglecting long-range dispersion and inconsistent thickness definitions were identified as primary causes of discrepancies.
  • Long-range dispersion influences surface tension in a thickness-dependent manner, affecting disjoining pressure calculations.
  • A crossover behavior in surface tension was observed for water nanofilms with the flexible SPC/E potential.
  • The revised Peng method, with proper treatment of dispersion and thickness, shows agreement with the Bhatt method.
  • More accurate Hamaker constants were obtained using the revised method.

Conclusions:

  • Accurate calculation of disjoining pressure requires careful consideration of long-range dispersion forces and precise film thickness definition.
  • The revised Peng method provides a more reliable approach for simulating liquid nanofilms and determining their properties.
  • This work contributes to a better understanding of interfacial phenomena in nanoscale systems.