Molecular dynamics study of nanoparticles and non-ionic surfactant at an oil-water interface

R. J.K.Udayana Ranatunga, Chuong T. Nguyen, Blake A. Wilson, Wataru Shinoda, Steven O. Nielsen

Research output: Contribution to journalArticlepeer-review

51 Citations (Scopus)

Abstract

Nanoparticles (NPs) and surfactants can spontaneously concentrate at the interface between two immiscible liquids, such as oil and water. Systems of high oil-water interfacial area, such as emulsions, are the basis of many industries and consumer products. Although NPs and surfactants are currently incorporated into many of these applications, their mutual interfacial behavior is not completely understood. Here we present molecular dynamics simulations of NPs and non-ionic surfactant in the vicinity of an oil-water interface. It was found that in low concentration the surfactants and NPs show cooperative behavior in lowering the oil-water interfacial tension, while at higher surfactant concentration this synergy is attenuated. It was also found that binding of surfactants to the NP surface decreases the surfactant efficiency in lowering the interfacial tension, while concurrently creating a barrier to NP aggregation.

Original languageEnglish
Pages (from-to)6942-6952
Number of pages11
JournalSoft Matter
Volume7
Issue number15
DOIs
Publication statusPublished - Aug 7 2011
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics

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