Dresden 2009 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 2: Focus: Amphiphilic Systems II

CPP 2.8: Vortrag

Montag, 23. März 2009, 16:45–17:00, ZEU 222

Structural changes in aqueous lecithin and bile salt mixtures: dependence on ionic strength — •Dilek Madenci and Stefan U. Egelhaaf — Physik der weichen Materie, Heinrich-Heine Universität, Düsseldorf, Germany

Mixtures of lecithin and bile salt form mixed micelles and vesicles in aqueous solution. Their properties have been well-studied under physiological conditions (150 mM electrolyte, pH 7-8), while other conditions are still hardly explored. Upon increasing ionic strength the formed structures and the transitional pathways (micelles, coexistence of micelles and vesicles, and vesicles), change the generated structures completely from those observed under physiological conditions. We quantitatively determined these structures formed in a broad range of electrolyte concentrations with various scattering techniques, x-ray, light and neutron scattering and calorimetry.