Regensburg 2007 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 15: Diffusion and Transport Processes

CPP 15.7: Vortrag

Dienstag, 27. März 2007, 16:15–16:30, H47

Single molecule fluorescence correlation spectroscopy study of polymer-surfactant interactions — •Stanislaus John Bosco¹, Heiko Zettl¹, Jérôme Crassous², Matthias Ballauff², and Georg Krausch² — ¹Physikalische Chemie II, Universität Bayreuth, 95440, Bayreuth, Germany — ²Physikalische Chemie I, Universität Bayreuth, 95440, Bayreuth, Germany

The association between water soluble polymers and surfactants has drawn much attention to understand the fundamental properties in intermolecular interactions and hydrophobic aggregation phenomena. In order to understand the polymer/surfactant interactions in a single molecule level, we have used fluorescence correlation spectroscopy (FCS). As a model system we investigated complex formation between a hydrophobically modified nonionic polymer, methyl cellulose and the anionic surfactant sodium dodecyl sulfate (SDS) in water. FCS can follow the motion of individual SDS micelles and single MC/SDS aggregates via measurement of the diffusion time of single dye molecules attached to MC/SDS complexes [1]. Two possible aggregations (large and small) can be distinguished above the critical aggregation concentration (CAC). Rheology was used to follow the macroscopic properties of the polymer/surfactant systems. The dynamic behavior of the large aggregates found in FCS resembles the macroscopic properties. Moreover the influence of temperature on the aggregation behavior has also been studied.

[1] S. John Bosco, H. Zettl, J.J Crassous, M. Ballauff, G. Krausch, Macromolecules, 39, 8793-8798 (2006)