Shape Changes of C16TABr Micelles on Benzene Solubilization

Niklas Hedin, Ruslan Sitnikov, István Furó, Ulf Henriksson, Oren Regev

Research output: Contribution to journalArticlepeer-review

49 Scopus citations

Abstract

The microstructure of C16TABr micelles with solubilized benzene was investigated by field-dependent 2H NMR spin relaxation of C16TABr-α-d2. The relaxation data, supported by cryogenic transmission electron microscopy that excludes oblate micelle shapes, suggest that the C16TABr micelles, slightly elongated even without benzene, become longer and more polydisperse on benzene addition. Field-dependent 2H spin relaxation measurements on the benzene (C6D6) indicate that at low solubilizate content the benzene is predominantly located at the micellar interface, reorients more slowly than in bulk, and has a high lateral diffusion coefficient. Above a particular benzene concentration, the surfactant relaxation data suggest no further elongation but a radial growth, while the benzene relaxation shows that a large part of the benzene is residing in an interior region with near-bulk characteristics; the micelles become slightly elongated microemulsion droplets.

Original languageEnglish
Pages (from-to)9631-9639
Number of pages9
JournalJournal of Physical Chemistry B
Volume103
Issue number44
DOIs
StatePublished - 4 Nov 1999

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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