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Related Experiment Videos

Vesicle formation from temperature jumps in a nonionic surfactant system.

Karin Bryskhe1, Sanja Bulut, Ulf Olsson

  • 1Physical Chemistry 1, Center for Chemistry and Chemical Engineering, Lund University, P.O. Box 124, S-221 00 Lund, Sweden. Karin.Bryskhe@fkem1.lu.se

The Journal of Physical Chemistry. B
|July 21, 2006
PubMed
Summary

Heating tetraethyleneglycol dodecyl ether (C12E4) and water mixtures causes micelles to fuse into a living network. This network then transforms into bilayer vesicles upon further heating, with vesicle size dependent on heating rate.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Soft Matter Physics

Background:

  • Surfactant solutions exhibit complex phase behavior.
  • Micellar phases can transition into other ordered structures under varying conditions.
  • Understanding these transitions is crucial for materials design.

Purpose of the Study:

  • To investigate the phase transitions of tetraethyleneglycol dodecyl ether (C12E4) and water mixtures upon heating.
  • To characterize the formation and properties of aggregates during phase separation.
  • To elucidate the mechanism of vesicle formation from micellar networks.

Main Methods:

  • Heating experiments on C12E4/water binary system.
  • Analysis of micellar aggregation and phase separation.

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  • Characterization of vesicle formation and size determination.

    • Main Results:

    • Heating from the micellar phase (L1) into the two-phase region (L1' + L1'') leads to the formation of a "living network" of branched cylindrical micelles.
    • The static correlation length of micelles increases from 10 nm to 80 nm with increasing concentration.
    • In the L1' + L(alpha) region, these networks transform into bilayer vesicles with a hydrodynamic radius around 200 nm.
    • Vesicle size is influenced by the extent of micellar fusion and the heating rate, with fusion being slower than diffusion-limited aggregation.

    Conclusions:

    • The heating process induces a unique micellar aggregation pathway leading to vesicle formation.
    • The rate of heating plays a critical role in determining the final vesicle characteristics.
    • This study provides insights into the self-assembly mechanisms of surfactants in aqueous solutions.