Regensburg 2013 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 9: Poster: Interfaces and Thin Films (joint session with DECHEMA and VDI)

CPP 9.29: Poster

Monday, March 11, 2013, 17:30–19:30, Poster C

Hindered Domain Formation of Lipid Monolayers with Adsorbed Macromolecules — •Thomas Ortmann, Heiko Ahrens, and Christiane A. Helm — Inst. für Physik, Uni Greifswald, D-17487 Greifswald

Polyelectrolytes adsorb onto oppositely charged lipid monolayers either in a flatly disordered or a two-dimensional lamellar phase as known from Grazing Incidence Diffraction. With a Brewster angle microscope, nucleation and growth of lipid domains in the condensed phase are observed with short polyelectrolytes. These polyelectrolytes adsorb in a disordered phase when the lipids are in the fluid phase but order in the two-dimensional lamellar phase when the lipids are in the condensed phase. Long polyelectrolytes adsorb always in the two-dimensional lamellar phase beneath both lipid phases. Then, domain nucleation and growth is never observed. We suggest that the lipid rearrangement occurring on domain formation is not possible when to many lipids are electrostatically bound to one macromolecule.