Berlin 2012 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 22: Poster: Charged Soft Matter

CPP 22.6: Poster

Mittwoch, 28. März 2012, 11:00–13:00, Poster A

Influence of two-dimensional lamellar phase of PSS on the condensed phase of oppositely charged TAP monolayers — •Heiko Ahrens, Thomas Ortmann, Andreas Gröning, Frank Lawrenz, and Christiane A. Helm — Institut für Physik, Uni Greifswald, Felix-Hausdorff-Str. 6, 17487 Greifswald, Germany

Polystryene sulfonate (PSS) is adsorbed from dilute solution (0.01 mM with respect to the monomer concentration) onto oppositely charged TAP lipid monolayers. TAP lipids are 1,2-alkyl-trimethylammonium-propane with different alkyl chains (14, 16, 18). PSS adsorption stabilizes the monolayer and changes alkyl chain order (NNN to NN) in the liquid condensed phase as evidenced by grazing incidence X-ray diffraction (GID). Simultaneously, with GID the two-dimensional lamellar phase of PSS is observed. The rod scans of the peaks attributed to the PSS reveal that the two-dimensional lamellar phase imposes a slight vertical distortion on the lipid monolayer. The combined analysis of electron density profiles measured by X-ray reflectivity and the rod scans allow to assign the scattering centers within the lipid monolayers. The results are consistent for the different alkyl chain lengths.