Kinetics of the self-assembly of gemini surfactants

C. Groth, M. Nydén, K. Holmberg*, J. R. Kanicky, D. O. Shah

*Corresponding author for this work

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

A stopped-flow technique combined with pulsed-field-gradient spin-echo nuclear magnetic resonance (NMR) measurements was used to study the kinetics of exchange, size, and shapes in micellar systems of cationic surfactant dimers of the alkanediyl-α-ω-bis(dodecyldimethylammonium bromide) type, with alkanediyl being 1,2-ethylene, 1,3-propylene, and 1,4-butylene. By measuring the slow relaxation time for micelles, τ2, the micelle lifetime as a function of spacer length was obtained and was further confirmed by micelle exchange measurements by NMR diffusometry. The micelle lifetimes for the gemini surfactants were found to be in orders of magnitude longer than for the corresponding conventional surfactants. All three cationic surfactant dimers showed an increase in micelle size in one direction, i.e., became prolates, as the concentration was increased. The growth of the micelles was most pronounced for the gemini surfactants with the shortest linker unit, i.e., ethylene.

Original languageEnglish
Pages (from-to)247-255
Number of pages9
JournalJournal of Surfactants and Detergents
Volume7
Issue number3
DOIs
Publication statusPublished - Jul 2004
Externally publishedYes

Keywords

  • Dimeric
  • Gemini surfactants
  • Kinetics of micellization
  • Lifetime of micelles
  • NMR
  • Self-diffusion
  • Slow relaxation time
  • Stopped flow

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