Pressure dependence of the critical micelle concentration of a nonionic surfactant in water studied by 1H-NMR

Markus Lesemann, Kanthimathi Thirumoorthy, Yoo Joong Kim, Jiri Jonas, Michael E. Paulaitis

Research output: Contribution to journalArticle

Abstract

The critical micelle concentration (cmc) of the nonioaic surfactant C8E5 in D2O was measured at 30 °C and pressores up to 350 MPa nsing 1H-NMR chemical shifts. The cmc was found to increase with pressure up to approximately 150 MPa and then decrease at higher pressures. This characteristic pressure dependence is similar to that reported for several ionic surfactant solutions and is in quantitative agreement with the effect of preasure an the transfer of hydrocarbons from water into oonpolar solvents. We conclude, therefore, that the observed behavior is independent of the hydrophilic headgroup of the surfactant and that it reflects a pressure-induced destabilization of the Hydrophobic micelle interior at low pressures and enhanced stabilization at high pressures.

Original languageEnglish (US)
Pages (from-to)5339-5341
Number of pages3
JournalLangmuir
Volume14
Issue number19
DOIs
StatePublished - Sep 15 1998

ASJC Scopus subject areas

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

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