Berlin 2012 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 22: Poster: Charged Soft Matter
CPP 22.17: Poster
Mittwoch, 28. März 2012, 11:00–13:00, Poster A
Mixtures of Chitosan and Oppositely Charged Alkyl Ethoxy Carboxylates: Complex Hierarchical Structures — •Leonardo Chiappisi1, Sylvain Prévost1,2, and Michael Gradzielski1 — 1Stranski-Laboratorium für Physikalische Chemie und Theoretische Chemie, Institut für Chemie, Technische Universität Berlin, Berlin, Germany — 2Helmholtz-Zentrum Berlin, Berlin, Germany
Mixtures of polyelectrolytes and surfactants are widely used in a large number of fields, such as detergency, pharmaceutical formulations, food industry, etc. Their aggregation is driven by several forces, ranging from electrostatic to hydrophobic interaction and mostly by the entropic gain due to the release of counterions from both polymer and surfactant micelles.
Here, we present a comprehensive structural study on mixtures of the biopolycation chitosan and the highly biocompatible alkyl ethoxy carboxylates. In order to elucidate the structure of these complexes, static and dynamic light scattering (SLS and DLS) have been used to explain the large scale structure, whereas small angle neutron scattering (SANS) has been employed to determine the internal structure of the complexes.
The results show that the shape of the micelle is retained within the complex, that they are locally linearly ordered and that the large scale structure is determined by the folding of the polymerchain. In addition, the formation at higher surfactant content of larger and hierarchically ordered structures made up of many polyelectrolyte chains is proven.