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BP: Fachverband Biologische Physik

BP 15: Postersession III

BP 15.8: Poster

Tuesday, March 13, 2018, 14:00–16:00, Poster B

Surface micelles in lipid monolayers in the LE phase — •Florian Gellert, Renko Kensbock, Heiko Ahrens, and Christiane A. Helm — Inst. f. Physics, Greifswald University, Germany

We investigate lipid and cardiolipin monolayers at the water-air interface with isotherms and real-time Brewster angle microscopy (BAM). These monolayers are in the LE phase; either they do not have an LC phase or the surface pressure is below the LE/LC phase transiton. Nevertheless, dependent on the ion concentration in the subphase the formation of domains is observed with BAM. On monolayer compression the domains increase mainly in number, not in size. The observation of surface micelles is correlated with the isotherm and the area compressibility modulus. Surface micelles of mobile lipids at a fluid interface can be used as a simple model of self-regulation of lipid membranes.