Dresden 2009 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 43: New Materials

CPP 43.6: Vortrag

Freitag, 27. März 2009, 11:45–12:00, ZEU 114

A Novel Lipid-Polyelectrolyte Composite Structure on Polyelectrolyte Multilayer Coated Colloidal Particles — •Edwin Donath¹, Irina Estrela-Lopis¹, Luis Cuellar¹, Martin Fischlechner², and Sergio Moya³ — ¹Institute of Medical Physics and Biophysics, 04107 Leipzig, Härtelstrasse 16/18, Germany — ²Nanoscience Centre, Cambridge, United Kingdom — ³CICBIOMAGUNE, San Sebastian, Spiain

Polyelectrolyte multilayers from poly(diallyl dimethyl ammonium chloride) PDADMAC and poly (styrene sulfonate) were formed on silica particles. Then unilamellar lipid vesicles containing mixtures of acidic and zwitterionic lipids were added to the multilayer coated particles. While with other multilayer coatings not containing PDADMAC this resulted usually in the deposition of a lipid bilayer, we observed in the presence of PDADMAC a unique structural transition of the multilayer induced by the interaction with and the subsequent adsorption of lipids into the multilayer. The resulting structure showed a 3D-distribution of circular inhomogeneities on scales ranging from nanometers to microns. These inhomogeneities were identified by a different softness probed with AFM. Otherwise the surface was surprisingly smooth. FTIR linvestigations revealed the special properties of water near the quarternary ammonium groups which was subsequently replaced by lipids. We believe, this is beside electrostatic interaction one of the driving forces for the very strong interaction. The composite polyelectrolyte film on the particles shows unique transport properties and may find interesting applications as a novel material.