CURVATURE AND GEOMETRIC CONSTRAINTS AS DETERMINANTS OF MICROEMULSION STRUCTURE: EVIDENCE FROM FLUORESCENCE ANISOTROPY MEASUREMENTS.

Vicki Chen, Gregory G. Warr, D. Fennell Evans, Frank G. Prendergast

Research output: Contribution to journalArticle

24 Scopus citations

Abstract

Steady-state anisotropy measurements using an amphiphilic fluorescence probe, (trimethylamino)diphenylhexatriene (TMA-DPH), and an oil-soluble probe, diphenylhexatriene (DPH), are reported for three-component microemulsions, employing didodecyldimethylammonium bromide (DDAB) as the surfactant, simple alkanes, and water. The anisotropies of TMA-DPH are almost constant when oil is added to the microemulsions but decrease upon addition of water. The results are interpreted in terms of a structural model based on geometric packing constraints of surfactant-coated cylinders and spheres. The anisotropy shows local changes at the surfactant-water-oil interface which in turn can be related to global structure.

Original languageEnglish (US)
Pages (from-to)768-773
Number of pages6
JournalJournal of physical chemistry
Volume92
Issue number3
DOIs
StatePublished - Jan 1 1988

ASJC Scopus subject areas

  • Engineering(all)
  • Physical and Theoretical Chemistry

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