Equilibrium shape of two-component unilamellar membranes and vesicles

D. Andelman, T. Kawakatsu, K. Kawasaki

Research output: Contribution to journalArticlepeer-review

101 Scopus citations


We show that a strong segregation of a two-component surfactant system coupled to the local membrane curvature has a pronounced effect on the shape of unilamellae or closed vesicles. For an average flat lamella, the preferred periodicity in the local composition as well as the lamellar shape is calculated and depends on the ratio between surface tension and bending modulus. In the case of a closed visicle with a fixed total area, there is no selected periodicity in contrast to the unilamellar case. For vesicles subjected to positive or negative inner pressure, we calculate their shape numerically, whereas when there is no added inner pressure, the shape is found analytically to be composed of circular sections.

Original languageEnglish
Pages (from-to)57-62
Number of pages6
JournalJournal de Physique (Paris), Lettres
Issue number1
StatePublished - 1 May 1992


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