Solvent and nonlinear effects on the charge renormalization of nanoparticles within a molecular electrolyte model

P. González-Mozuelos*, M. Olvera de la Cruz

*Corresponding author for this work

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

A general analysis of the effect of the molecular structure of a polar solvent on the effective interactions among suspended charged nanoparticles (macroions up to 30 nm in size) is performed using a simple molecular model for the solvent in the supporting electrolyte. The solvent molecules are modeled as small rods with end point charges of opposite sign and equal magnitude, whereas the small ions are assumed to be point-like. We compare the renormalized charges of the effective pair potentials (EPPs) among the spherical nanoparticles, obtained after contracting the supporting electrolyte, with those obtained from a similar model, which does not include the solvent molecules. The parameters of both models have been adjusted to give the same screening length. The comparison shows that the renormalized charges are overestimated when the molecular structure of the solvent is neglected. This is in agreement with the image charge effect induced by the different permittivities inside and outside the nanoparticles for the model with explicit solvent molecules; an effect that is missing in the model without solvent molecules. A new numerical method allows us to explore macroion diameters much larger than the solvent molecular size.

Original languageEnglish (US)
Pages (from-to)5362-5370
Number of pages9
JournalPhysica A: Statistical Mechanics and its Applications
Volume387
Issue number22
DOIs
StatePublished - Sep 15 2008

Keywords

  • Charge renormalization
  • Molecular electrolyte

ASJC Scopus subject areas

  • Statistics and Probability
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Solvent and nonlinear effects on the charge renormalization of nanoparticles within a molecular electrolyte model'. Together they form a unique fingerprint.

  • Cite this