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We developed a new model for simulating liquid behavior near surfaces, accounting for directional dielectric properties. This anisotropic interfacial continuum solvation (AICS) model reveals how these properties affect surface energy and molecular behavior.

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Area of Science:

  • Computational chemistry
  • Materials science
  • Physical chemistry

Background:

  • Simulating liquid behavior at solid-liquid interfaces requires accounting for anisotropic dielectric properties.
  • Existing models often simplify these complex interfacial interactions.

Purpose of the Study:

  • To develop and implement an Anisotropic Interfacial Continuum Solvation (AICS) model.
  • To accurately capture distinct in-plane and out-of-plane dielectric constants and their spatial variations near interfaces.
  • To enable more realistic simulations of interfacial phenomena.

Main Methods:

  • Developed the AICS model with distance- and electron density-dependent dielectric functions.
  • Derived analytical expressions for electrostatic Kohn-Sham potential and atomic forces.
  • Implemented AICS and analytical derivatives in the CP2K software package.
  • Developed a parallel finite-element anisotropic Poisson solver (FEAPS) using FEniCSx.
  • Validated analytical forces and benchmarked electrostatic potentials against established methods.

Main Results:

  • The AICS model and FEAPS solver were successfully implemented and validated.
  • Simulations near the Ag(111) surface showed enhanced in-plane and reduced out-of-plane dielectric functions.
  • Calculated work functions and electrostatic potentials exhibited more pronounced shifts and spatial modulation under anisotropic conditions.
  • The adsorption geometry of OH* was optimized, showing a tilt towards the surface plane.

Conclusions:

  • The AICS model provides a more accurate representation of anisotropic solvation at interfaces.
  • Anisotropic dielectric properties significantly influence interfacial energetics and molecular adsorption.
  • This work enables more precise computational studies of interfacial phenomena in various chemical and physical systems.