Regensburg 2007 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 20: POSTER: Biological Systems + New Materials

CPP 20.28: Poster

Wednesday, March 28, 2007, 16:00–18:30, Poster B

Aligned Polyectrolyte Chains Adsorbed onto an Oppositely Charged Lipid Monolayer — •Jens-Uwe Günther, Olaf Soltwedel, Heiko Ahrens, and Christiane A. Helm — Institut für Physik, Ernst-Moritz-Arndt Universität, F.-L.-Jahn-Str. 16, D-17487 Greifswald, Germany

The negatively charged polyelectrolyte PSS (Poly styrene sulfonate) is adsorbed onto positively charged TAP or DOAB monolayers (1,2-Dipalmitoyl-3-Trimethylammonium-Propane, dioctadecyammonium bromide, respectively) at the water surface. The structure of the supramolecular colmplex is investigated with synchrotron grazing incidence diffraction. In-plane diffraction peaks at small angles measure the separation of the aligned polyelectrolyte chains, while those at large angles measure the quasi-crystalline structure of the alkyl chains within the lipid monolayer. Depending on the polyelectrolyte concentration in solution, the lipid charge is partially neutralized by the PSS and partially by anions, or complete charge compensation occurs. The influence of the ion concentration in the aqueous polyelectrolyte solution is discussed. The two peaks of the rod-scan at small angles indicate that the lipid monolayer buckles directly above the aligned PSS chains.