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CPP: Chemische Physik und Polymerphysik

CPP 5: Polyelectrolytes

CPP 5.6: Vortrag

Montag, 27. März 2006, 16:00–16:15, ZEU 160

Ion Profile in Polyelectrolyte Multilayers Studied by Standing Wave X-ray Fluorescence — •Hauke Schollmeyer^1,2, Regine von Klitzing³, Patrick Guenoun¹, and Jean Daillant¹ — ¹LIONS bât. 125, CEA Saclay,F-91191 Gif Cedex, France — ²Institute for X-Ray Physics, Georg-August-University, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany — ³Institut für Physikalische Chemie, CAU Kiel, Ludewig-Meyn-Str. 8, D-24118 Kiel, Germany

The alternating electrostatic adsorption of cationic and anionic polyelectrolytes has attracted some attention over the last years. These multilayer complex films are a good model system to study permeability of ions. They are prepared using layer-by-layer adsorption of oppositely charged polyelectrolytes. Only little work was done on the study of permeabilities of protons and ions through these layers. In most cases fluorescence dyes were used to measure the ion distribution in the films. The influence of these dyes on the ion diffusion through the polymeric film is not known. In particular for thin films these dyes disturb the system. Furthermore this technique is limited to specific molecules respective to the dye. A comprehensive study of the ion distribution and ion diffusion in these layers, in particular without grafting a disturbing molecule, is missing. For this we used standing waves x-ray fluorescence to measure the ion distribution of polyelectrolyte multilayers. With that technique it is possible to measure the permeabilities of polyelectrolyte multilayers with respect to small ions of different size and charge.