Dresden 2017 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 10: Bioinspired Functional Materials II

CPP 10.3: Vortrag

Montag, 20. März 2017, 15:30–15:45, ZEU 114

Shear-induced transformation of polymer-rich lamellar phases to micron sized vesicles investigated by small-angle scattering — •Sören Großkopf1, Miriam Siebenbürger2, Oliver Wrede1, Yvonne Hertle1, and Thomas Hellweg11Bielefeld University — 2Helmholtz-Zentrum Berlin

The influence of adding an amphiphilic triblock copolymer to a cationic microemulsion results on the one hand in an increasing viscosity and on the other hand in complexer phase behavior with an enhanced lamellar phase. This is a common feature of amphiphilic block copolymers related to the efficiency boosting effect. The aim of this work was to fabricate multi-lamellar-vesicles (MLV) out of a triblockcopolymer-rich lamellar phase applying stress and their identifaction via small angle scattering. The system consists beside the the polymer of a polar and apolar component and an cationic co-surfactant. Such large vesicles are of potential interest for the usage as drug delivery systems. Different rheo-small-angle scattering techniques were used to investigate structures while applying shear stress: With neutrons the change in the bilayer spacing can be investigated. For the research of larger structures depolarized rheo-small-angle light scattering (rheo-SALS) was used. The rheo-SALS experiments shows an inverse dependency of the applied shear-rate on the size of the MLVs. Beside the small-angle scattering experiments different microscopy techniques (polarized light, difference interference contrast microscopy) was used to obtain real space pictures of the resulting particles.

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