Micelle growth of cationic gemini surfactants studied by NMR and by time-resolved fluorescence quenching

Ali Reza Tehrani-Bagha, Krister Holmberg, Magnus Nydén, Lars Nordstierna*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

The micelle growth of a series of five cationic gemini surfactants has been investigated by time-resolved fluorescence quenching (TRFQ) and by two NMR techniques, line width analysis and diffusometry. The surfactant series was designed such that the effect of a number of variables could be assessed: length of the spacer unit, presence of ester bonds in the tails close to the head groups, and presence of a hydroxyl group in the spacer. For the gemini with long spacer, the micelles remained relatively small in size upon an increase of the concentration. The gemini surfactants with short spacer, on the other hand, showed a considerable micellar growth as the concentration was raised. It is of particular interest that the relatively simple line width analysis of one dimensional 1H NMR spectra gave qualitatively the same results as the more sophisticated TRFQ and NMR diffusometry techniques.

Original languageEnglish
Pages (from-to)145-149
Number of pages5
JournalJournal of Colloid and Interface Science
Volume405
DOIs
Publication statusPublished - 1 Sep 2013
Externally publishedYes

Keywords

  • Gemini surfactants
  • Esterquats
  • NMR diffusometry
  • Time resolved fluorescence quenching
  • Micelle shape
  • Micelle size

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