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Surface reconstruction amendment to the intrinsic sampling method.

Francis G J Longford1, Jonathan W Essex1, Chris-Kriton Skylaris1

  • 1University of Southampton, Southampton SO17 1BJ, United Kingdom.

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|December 24, 2018
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Summary
This summary is machine-generated.

The intrinsic sampling method (ISM) can over-fit molecular simulation data, creating artifacts. A new "surface reconstruction" method improves ISM accuracy for interfacial properties and aligns with capillary wave theory.

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Area of Science:

  • Computational chemistry
  • Materials science
  • Statistical mechanics

Background:

  • The intrinsic sampling method (ISM) is used to analyze interfacial properties in molecular simulations.
  • A key challenge is the ambiguity arising from the non-physical nature of the "intrinsic" surface, impacting comparisons with experimental data.

Purpose of the Study:

  • To address the over-fitting issue in the current ISM procedure.
  • To reduce the disparity between simulated and experimental interfacial properties.
  • To improve the accuracy of theoretical predictions for interfacial structures.

Main Methods:

  • Developed a "surface reconstruction" method to refine the ISM fitting procedure.
  • Applied the improved ISM to a simulated Lennard-Jones fluid air-liquid interface.
  • Analyzed the global curvature distribution and interfacial density profiles.

Main Results:

  • The surface reconstruction method corrects the biased curvature distribution caused by ISM over-fitting.
  • This correction alleviates the artifactual disparity in predicted interfacial densities.
  • An unexpected correlation was found between reconstructed ISM surfaces and extended capillary wave theory predictions.

Conclusions:

  • The surface reconstruction method enhances the physical realism of ISM-derived interfaces.
  • This advancement resolves known artifacts in ISM analysis.
  • The findings offer new insights into the relationship between simulation methods and theoretical frameworks for interfacial phenomena.