Dresden 2009 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 16: POSTERS Polyelectrolytes and Biological Systems

CPP 16.22: Poster

Dienstag, 24. März 2009, 14:00–16:30, P3

Silicon Rubber as Support for PEM Films: Rubber Surface Properties at Different Preparation Procedures — •Johannes Früh1, Rumen Krastev2, and Ralf Köhler3,11MPI of Colloids and Interfaces, Dept. Interfaces, Potsdam, Germany — 2NMI, WB Bioanalytik, Tübingen, Germany — 3Helmholtz Centre Berlin for Materials and Energy, Dept. SF1, Berlin, Germany

Silicon rubber (polydimethyl siloxane [PDMS]) shall serve as support for polyelectrolyte multilayers (PEM) an organic material made from oppositely charged organic polyions. Both materials were intensively investigated in the past, but little is known about their conjoint behaviour and interactions.

Since the reproducible generation of compound PDMS-PEM systems demand for defined interfaces, the surface properties of PDMS have to be determined, and to be tuned in the end. Different techniques, as AFM, contact angle measurements, and X-ray reflectometry were used for surface characterisation. It turned out, that a gentle mixing process during the cross-linking of PDMS can supply microscopically flat rubber surfaces with roughnesses in nanometre range. Additional chemical surface treatment allows for tuning of adsorption behaviour (i.e. wetting/ dewetting) of PDMS-substrate. With it, a preparation techniques could be established which can provide molecularly flat soft-matter substrates with tunable surface properties.

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