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We derived pressure tensor components for 2D ionic fluids to calculate liquid-vapor line tension. Molecular dynamics simulations validated these components and assessed their impact on line tension and densities.

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Area of Science:

  • Physical Chemistry
  • Computational Chemistry
  • Soft Matter Physics

Background:

  • Pressure tensor components are crucial for determining interfacial tension in liquid-vapor systems.
  • Understanding these properties is essential for modeling fluid behavior at interfaces.

Purpose of the Study:

  • To derive expressions for pressure tensor components in two-dimensional (2D) ionic fluids using the primitive model.
  • To apply these expressions to calculate the line tension of a 1:1 2D ionic fluid via molecular dynamics (MD) simulations.
  • To validate the pressure tensor components by comparing simulated scalar pressure with literature values.

Main Methods:

  • Development of theoretical expressions for pressure tensor components in 2D primitive ionic models.
  • Execution of MD simulations for 2D liquid-vapor interfaces.
  • Calculation of line tension and coexisting densities.
  • Validation of pressure tensor components using single-phase simulations.

Main Results:

  • Expressions for pressure tensor components of 2D ionic fluids were successfully derived.
  • MD simulations allowed for the calculation of line tension for a 1:1 2D ionic fluid.
  • The calculated pressure tensor components were validated against bulk scalar pressure.
  • The influence of Ewald parameters, cutoff radius, and interfacial length on line tension and densities was investigated.

Conclusions:

  • The derived pressure tensor components are suitable for calculating line tension in 2D ionic fluids.
  • The study provides a validated method for assessing interfacial properties in reduced dimensions.
  • The findings highlight the importance of computational parameters in interfacial property calculations.