Dresden 2009 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 16: POSTERS Polyelectrolytes and Biological Systems

CPP 16.19: Poster

Tuesday, March 24, 2009, 14:00–16:30, P3

Correlation between swelling and internal mobility of polyelectrolyte multilayers — •Samuel Dodoo and Regine von Klitzing — Stranski-Laboratorium für Physikalische & Theoretische Chemie, Institut für Chemie, TU Berlin, Strasse des 17. Juni 124, D-10623 Berlin

Polyelectrolyte multilayers (PEM) have emerged as a method to build up well-defined coatings for several kinds of surface modifications, ranging from photonics to biomaterials, membrane and sensor applications. Their preparation is via the layer-by-layer adsorption method1. In this work the real-time monitoring of the layers adsorption and build-up in situ was performed by Quartz Crystal Microbalance (QCM). In addition, the lateral mobility of polyelectrolyte multilayers was investigated by means of the fluorescence recovery after photobleaching (FRAP) technique. The QCM results showed the successive build-up process of two-component multilayer and structural information such as swelling. From the FRAP measurements the results emerged that at high charge density, more complexes are formed, and the diffusion coefficient decreases2. Further more the lateral mobility increases with increasing ionic strength and with decreasing hydration shell of the added anion in the polyelectrolyte solution.

[1] G. Decher Science 1997, 277, 1232. [2] P. Nazaran, V. Bosio, W. Jaeger, D. F. Anghel, R. v. Klitzing J. Phys. Chem B 2007, 111,