Insights into Catanionic Vesicles Thermal Transition by NMR Spectroscopy

  • Gesmi MilcovichEmail author
  • Fioretta Asaro
Conference paper
Part of the Progress in Colloid and Polymer Science book series (PROGCOLLOID, volume 139)


Oppositely charged ionic surfactants can self-assemble into hollow structures, called catanionic vesicles, where the anionic-cationic surfactant pair assumes a double-tailed zwitterionic attitude. In the present work, multilamellar-to-unilamellar thermal transition of a mixed aqueous system of sodium dodecyl sulphate (SDS) and cetyl trimethyl ammonium bromide (CTAB), with a slight excess of the anionic one, has been investigated by 1H, 2H, 14N NMR spectra and 23Na transverse relaxation measurements. It has been inferred that an increase of the temperature enhances the SDS counterion dissociation, which can be considered as one of the driving forces of the mentioned transition. Moreover, interesting 23Na T2 changes with temperature have been detected for unilamellar aggregates.


Sodium Dodecyl Sulphate Sodium Dodecyl Sulphate Cetyl Trimethyl Ammonium Bromide Thermal Transition Sodium Dodecyl Sulphate Micelle 
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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  1. 1.Department of Chemical and Pharmaceutical SciencesUniversity of TriesteTriesteItaly

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