Effects of methanol on nanoparticle self-assembly at liquid-liquid interfaces: A molecular dynamics approach

Mingxiang Luo, Yanmei Song, Lenore Dai

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Molecular dynamics simulations have been performed to study the influence of methanol on the self-assembly of nanoparticles at liquid-liquid interfaces. The simulation shows that the methanol molecules, at low volume fraction, stay in the aqueous phase but with a preference of the water-trichloroethylene (TCE) interfaces. However, at higher methanol volume fraction, methanol dominates the aqueous phase and no preferable location of methanol molecules is observed. The simulations also suggest that the interfacial tension decreases and the interfacial thickness increases with increasing methanol concentration. The presence of the nanoparticles at water-TCE interfaces has minor effect on the interfacial properties compared to those of methanol, and the presence of methanol drives the noncharged nanoparticle clusters closer to the interfaces. Although the methanol molecules do not affect the monolayer distribution of the negatively charged nanoparticles at the water-TCE interfaces, they increase the three-phase contact angles of these nanoparticles.

Original languageEnglish (US)
Article number194703
JournalJournal of Chemical Physics
Volume131
Issue number19
DOIs
StatePublished - Nov 30 2009

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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