Dresden 2014 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 36: Colloids and Complex Liquids II
CPP 36.4: Vortrag
Mittwoch, 2. April 2014, 15:45–16:00, ZEU 114
Sub-millisecond dynamics of vesicles formation — •Rita Graceffa1,2, Sagar V. Kathuria3, Raul A. Barrea1, R. Paul Nobrega3, Srinivas Chakravarthy1, Osman Bilsel3, Thomas C. Irving1 und Thomas M. Weiss4 — 1BioCAT, CSRRI and Department BCS, Illinois Institute of Technology, 3101 South Dearborn, Chicago, IL 60616, USA — 2Institute for X-ray Physics, Georg-August-Universitat Goettingen, Friedrich-Hund-Platz 1, 37077 Goettingen, Germany — 3Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, 364 Plantation Street, LRB 919, Worcester, MA 01605, USA — 4Stanford University, Stanford Synchrotron Radiation Lightsource, 2575 Sand Hill Rd. MS69, Menlo Park, CA 94025, USA
Recently, the formation of vesicles has been studied in situ at millisecond time-scales and disk like intermediate states have been shown to exist in some mixed systems composed of zwitterionic and anionic surfactants. However, for vesicle formation from cationic-anionic surfactant mixture no such intermediates could be detected at the achieved time resolution.
We present a study of dynamics formation of unilamellar vesicles from a mixture of oppositely charged surfactants in the microseconds range. The vesicles spontaneous self-assembly was investigated by mixing anionic and cationic micelles in a micro-mixer. The reaction intermediates were probed with Small Angle X-ray and Förster Resonance Energy Transfer. The formation of the vesicles happens within the mixing time, 100 microseconds.