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Regensburg 2004 – wissenschaftliches Programm

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AKB: Biologische Physik

AKB 50: Poster Session "Biological Physics"

AKB 50.90: Poster

Freitag, 12. März 2004, 10:30–13:00, B

Giant Hexagonal Superstructures in Diblock-Copolymer Membranes — •Wojciech Góźdź1, Christopher Haluska2, Hans-Günther Döbereiner2,3, Stephan Förster4, and Gerhard Gompper31Institute of Physical Chemistry, PAS, Warsaw — 2Max-Planck-Institut für Kolloid- und Grenzflächenforschung, Potsdam — 3Department of Biology, Columbia University, New York — 4Institut für Physikalische Chemie, Universität Hamburg

In aqueous solutions, amphiphilic diblock copolymers self-assemble into bilayer membranes similar to phospholipid membranes. Such membranes can form spherical vesicles called polymersomes in analogy to liposomes, vesicles built from lipid molecules. We have discovered a new type of polymersomes, characterized by a genus of the order of one hundred. The genus describes the number of holes or handles in a vesicle. We have studied the properties of the high-genus polymersomes both experimentally and theoretically. We are particularly interested in the structure of the polymersome walls, which resemble locally a hexagonal network of passages. The structure of the walls can be altered by applying thermodynamic stimuli, for example temperature. A few types of ordered structures which form the wall of polymersomes have been observed experimentally, such as connected spheres, connected spindles, narrow and wide passages. The transition between different structures is predicted and the phase diagram is calculated [1]. The theoretical calculations are in good agreement with the experiments.
1. C. Haluska et al. , Phys. Rev. Lett., 89(2002), 238302

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