Regensburg 2013 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 49: Colloids and Complex Liquids III
CPP 49.9: Vortrag
Freitag, 15. März 2013, 11:45–12:00, H40
Shaping of Unilamellar Vesicles by the Admixture of Amphiphilic Copolymer — •Michael Gradzielski1, Katharina Bressel1, Michael Muthig1, and Theyencheri Narayanan2 — 1Stranski Laboratorium, Institut für Chemie, Technische Universität Berlin, Berlin, Germany — 2European Synchrotron Radiation Facility (ESRF), Grenoble, France
In our experiments fast formation kinetics was studied by coupling the stopped-flow technique to high-flux SANS/SAXS instruments, allowing to obtain detailed structural information with a time-resolution of 5-50 ms. For the case of forming monodisperse unilamellar vesicles takes place in a way purely governed by diffusion and proceeds via a disk-like intermediate state. Further aging processes can be observed which are related to the stability of the vesicles. The structural progression of such systems can be modelled by simulations which allow to understand the aging processes in terms simple coalescence processes. Based on the detailed knowledge of the formation process it was then possible to manipulate it by the admixture of amphiphilic copolymers. By doing so systematic control over the vesicle size can be exercised and in addition the presence of the copolymer enhances the vesicle stability largely.
In summary, based on knowing the pathway of the formation of the unilamellar vesicles it can be controlled by the presence of the copolymers and thereby shaping of vesicles occurs in a systematic fashion.