Modeling of a charged dielectric interface

Comparison of the continuum and discrete lattice representations of surface charges

Jiaxing Yuan, Yanwei Wang

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Abstract

Two main approaches in particle-based simulations for modeling a charged surface are using explicit, discrete charges and continuum, uniform charges. It is well-known that these two approaches could lead to substantially distinct ionic distributions, whereas a systematic exploration of the origin is still absent. In this short communication, we calculate the electrostatic force of a single point charge above a planar substrate characterized by a surface charge density and dielectric mismatch and compare the differences in the electrostatic forces produced by discrete and continuum representations of surface charges. We demonstrate that while the model of uniform surface charges gives a rather simple picture, the model of discrete surface charges can exhibit different scenarios, depending on the respective values of ion-surface distance versus lattice spacing and a self-image interaction parameter.

Original languageEnglish
Article number100184
JournalColloids and Interface Science Communications
Volume30
DOIs
Publication statusPublished - May 1 2019

Fingerprint

Surface charge
Static Electricity
continuums
Electrostatic force
Ions
Charge density
electrostatics
Communication
Substrates
communication
spacing
ions
simulation
interactions

Keywords

  • Charged interface
  • Continuum model
  • Discrete model
  • Electrostatic
  • Image charge

ASJC Scopus subject areas

  • Biotechnology
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry
  • Materials Chemistry

Cite this

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