Spontaneous curvature effects on spontaneous vesicles

J. A. Zasadzinski, H. T. Jung, B. Coldren, E. W. Kaler

Research output: Chapter in Book/Report/Conference proceedingChapter

1 Scopus citations

Abstract

In mixtures of cetyltrimethylammonium bromide (CTAB) and sodium perfluorooctanoate (FC7) in aqueous solution, novel bilayer cylinders with hemispherical end caps and open, flat discs coexist with spherical unilamellar vesicles, apparently at equilibrium. Such an equilibrium between bilayer cylinders, spheres and discs is only possible for systems with a spontaneous curvature, r0, and a positive Gaussian curvature modulus, κ We have measured the size distributions of the spherical vesicles, cylinders and discs using cryo-electron microscopy; a simple analysis of the size distributions then allows us to independently determine that the mean curvature modulus, κ ≈ 5±1kBT and κ ≈ 2±1kBT. The most probable spherical vesicle radius is 23 nm, giving a spontaneous curvature, r0 =19±1 nm. This is one of the few situations in which r0 , κ , and κ can be determined from the same experiment.

Original languageEnglish (US)
Title of host publicationSelf-Assembly
PublisherIOS Press
Pages432-442
Number of pages11
ISBN (Print)9781586033828
StatePublished - Nov 1 2003

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