Monte Carlo simulations of micellization in model ionic surfactants: Application to sodium dodecyl sulfate

Research output: Contribution to journalArticle

47 Scopus citations

Abstract

A lattice model for ionic surfactants with explicit counterions is proposed for which the micellization behavior can be accurately determined from grand canonical Monte Carlo simulations. The model is characterized by a few parameters that can be adjusted to represent various linear surfactants with ionic headgroups. The model parameters have a clear physical interpretation and can be obtained from experimental data unrelated to micellization, namely, geometric information and solubilities of tail segments. As a specific example, parameter values for sodium dodecyl sulfate were obtained by optimizing for the solubility of hydrocarbons in water and the structural properties of dodecane. The critical micelle concentration (cmc), average aggregation number, degree of counterion binding, and their dependence on temperature were determined from histogram reweighting grand canonical Monte Carlo simulations and were compared to experimental results. The model gives the correct trend and order of magnitude for all quantities but underpredicts the cmc and aggregation number. We suggest ways to modify the model that may improve agreement with experimental values.

Original languageEnglish (US)
Pages (from-to)4076-4083
Number of pages8
JournalLangmuir
Volume22
Issue number9
DOIs
StatePublished - Apr 25 2006

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

Fingerprint Dive into the research topics of 'Monte Carlo simulations of micellization in model ionic surfactants: Application to sodium dodecyl sulfate'. Together they form a unique fingerprint.

Cite this