DPG Phi
Verhandlungen
Verhandlungen
DPG

Regensburg 2004 – scientific programme

Parts | Days | Selection | Search | Downloads | Help

CPP: Chemische Physik und Polymerphysik

CPP 16: POSTER: Computational Physics, Complex Systems

CPP 16.30: Poster

Tuesday, March 9, 2004, 17:00–19:00, B

Fluorescence Correlation Spectroscopy Investigations of Water-soluble Polymers — •Tune B. Bonné1, Karin Lüdtke2, Rainer Jordan2, Petr Štěpánek3, and Christine M. Papadakis11Faculty of Physics and Earth Sciences, University of Leipzig, D-04103 Leipzig, Germany — 2Faculty of Chemistry, Technische Universität München, D-85747 Garching, Germany — 3Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Prague

Fluorescence correlation spectroscopy (FCS) is a method to study the self-diffusion of fluorescence-labeled molecules. The detection volume is very small (∼ 1 µm3), and the measurements are carried out on the basis of very few molecules in the detection volume.
Using FCS, we have studied the micellization of fluorescence-labeled poly(methyloxazoline)-poly(nonyloxazoline) diblock copolymers in aqueous solution. This polymer system is very versatile with respect to the degree of hydrophobicity of the blocks. In order to investigate the influence of the dye on the aggregation behavior, polymers with the dye attached to either the hydrophilic or the hydrophobic end were investigated. The critical micelle concentrations were determined with FCS. By comparing with results from dynamic light scattering (DLS), it is shown that the hydrodynamic radius of the micelles can reliably be determined using FCS. Temperature-resolved DLS showed, however, that after dissolution of the polymers in water at room temperature, large aggregates are formed, and stable micelles form only after heating the solutions.

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2004 > Regensburg