Regensburg 2013 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 33: Poster: Charged Soft Matter
CPP 33.10: Poster
Mittwoch, 13. März 2013, 16:30–18:30, Poster C
Polyelectrolytes Adsorbed onto Oppositely Charged Lipid Monolayers - Reduced Charge Densities — Thomas Ortmann1, •Heiko Ahrens1, Andreas Gröning1, Frank Lawrenz1, Andre Laschewsky2, and Christiane A. Helm1 — 1Inst. für Physik, Uni Greifswald, D-17487 Greifswald — 2Fraunhofer Institute for Applied Polymer Research, Potsdam-Golm, Germany
Polyelectrolytes in dilute solutions (10−5monoMol/L) adsorb in a two-dimensional lamellar phase to oppositely charged lipid monolayers at the air/water interface. To investigate the influence the electrostatic interaction, a statistic copolymer with 90% and 50% charged monomers and mixtures between charged and uncharged lipids are used. With grazing incidence diffraction the separation between stretched polyelectrolyte chains is determined. The monomer/lipid ratio is calculated. When the fraction of charged monomers is reduced to 50%, the chain distance decreases from 4.5nm to 3nm (at an area per lipid of 80Å2) i.e. less than proportional and the ratio of lipids to charged monomers decreases form 0.7 to 0.5. Similarly, when the fraction of charged lipids is decreased the distance of the polyelectrolyte chains is increased sub-proportionally.