Regensburg 2007 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 10: INTERNAL SYMPOSIUM Scattering Experiments I
CPP 10.8: Talk
Tuesday, March 27, 2007, 12:00–12:15, H37
Surfactant Phase Transitions: New Insights From Time-resolved Small-angle Scattering Experiments — Anniina Salonen1, Jacques Leng2, Peter Schurtenberger3, and •Stefan Egelhaaf4 — 1Institute of Chemistry, Karl Franzens University, 8010 Graz, Austria — 2LOF unité mixte CNRS/Rhodia/Bordeaux, 33608 Pessac, France — 3Department of Physics, University of Fribourg, 1700 Fribourg, Switzerland — 4Condensed Matter Physics Laboratory, Heinrich-Heine-University, 40225 Düsseldorf, Germany
Most early studies on surfactant systems have addressed their equilibrium behaviour. These remain a prerequisite for further progress, but attention is turning to nonequilibrium phenomena. I plan to present two recent projects in this area:
First, time-resolved small-angle neutron scattering is used to investigate the intermediate structures during the growth of mixed micelles. The growth of the micelles is induced by a reduction in total surfactant concentration, which is realized by rapid mixing of a surfactant solution with buffer. The subsequent structural changes are followed by time-resolved small-angle neutron scattering.
Second, structural changes during the dissolution of lamellar phase are studied with small-angle x-ray scattering. After contact with water, lamellar phase can form fascinating interface instabilities, so-called myelins. Using time and space resolved small-angle x-ray scattering we investigate the changes in the lamellar phase during the formation and growth of these structures.