Coarse-grained molecular modeling of non-ionic surfactant self-assembly

Wataru Shinoda, Russell Devane, Michael L. Klein

Research output: Contribution to journalArticlepeer-review

194 Citations (Scopus)

Abstract

A coarse-grained (CG) molecular model for nonionic surfactants is presented. The transferability and versatility are demonstrated by applying the model to the bulk aqueous solution as well as to the air-water and oil-water interfacial systems. The model is designed to reproduce several key properties including surface/interfacial tension, bulk density, compressibility, hydration/transfer free energy as well as distribution functions obtained by all-atom molecular dynamics simulations. The CG surfactants are demonstrated to spontaneously organize into micelles, and either hexagonal or lamellar bulk structures, respectively, at the corresponding concentration and thermodynamic conditions for those phases. Moreover, even a hexagonal-to-lamellar phase transformation is attainable using the present CG model. The experimental surface pressure-area (π-A) curve for a representative surfactant monolayer at the air-water interface is well reproduced. Micelle budding is observed from an overly compressed monolayer; a phenomenon that is likely to be a reasonable finding because the hydration/transfer free energy is a fitted parameter in the model. The correct molecular partitioning together with a relatively rapid relaxation of the CG model system towards equilibrium enables the computation of self-assembled surfactant behavior at the mesoscale regime.

Original languageEnglish
Pages (from-to)2454-2462
Number of pages9
JournalSoft Matter
Volume4
Issue number12
DOIs
Publication statusPublished - 2008
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics

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