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Incomplete lipid chain freezing of sonicated vesicular dispersions of double-tailed ionic surfactants

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Author

  • Pieter Saveyn
  • Paul Van der Meeren
  • Jan Cocquyt
  • Torbjörn Drakenberg
  • Gerd Olofsson
  • Ulf Olsson

Summary, in English

Lipid freezing in dilute sonicated vesicular dispersions was studied using differential scanning calorimetry (DSC) and H-1 NMR. For charged, anionic, or cationic lipids, approximately half of the lipids remain in a fluid state when cooled 20 degrees C below the main chain melting temperature. With a zwitterionic phospholipid, on the other hand, essentially no supercooling of the liquid state was observed. The observations are analyzed in terms of the nucleation and growth of flat solid domains in originally fluid spherical vesicles. As the solid domains grow, the remaining fluid domain is deformed, resulting in a curvature stress. Depending on the vesicle size and the bilayer bending rigidity, the solid domain growth may terminate as the gain in cohesive free energy is balanced by the curvature stress of the remaining fluid domain. It is argued that high bending rigidities are required for, having a significant supercooling, which is why it is only observed for charged lipids.

Publishing year

2007

Language

English

Pages

10455-10462

Publication/Series

Langmuir

Volume

23

Issue

21

Document type

Journal article

Publisher

The American Chemical Society (ACS)

Topic

  • Physical Chemistry

Status

Published

ISBN/ISSN/Other

  • ISSN: 0743-7463