Dresden 2009 – wissenschaftliches Programm
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SYSO: Symposium Self-organizing Surfaces and Interfaces
SYSO 3: Self-Organizing Surfaces and Interfaces - Posters
SYSO 3.3: Poster
Mittwoch, 25. März 2009, 17:30–19:30, P3
Self-organisation and orientation of 1-Palmitoyl-2-Oleoyl-sn-Glycero-3-Phosphocholin (POPC) at the surface of hydroxypropionitrile — •Hartwig Pohl1, Thomas Krebs2, Stefan Kreysler1, and Harald Morgner1 — 1Leipzig University, Wilhelm-Ostwald-Institute for Physical and Theoretical Chemistry, Linnéstr. 2, D-04103 Leipzig — 2University of Wisconsin, Chemistry Department, 1101 University Ave, Madison, WI 53706
The understanding of the self-organisation of lipids at the surface of polar liquids is of great interest in biochemical as well as in technical topics. In order to gain information about the surface structure of POPC in hydroxypropionitrile, we have performed investigations using various particle spectroscopies, including metastable induced electron spectroscopy [H Morgner 2000 Adv. At. Mol. Opt. Physics 42B 387-488], XPS and ISS. Recent ARXPS-data suggest that at low concentrations the polar head groups are located at the surface, rather than the hydrophobic chains [F Knoll 2001 PhD-thesis University Witten-Herdecke]. This is supported by investigations with NICISS [T Krebs 2006 PhD-thesis Leipzig University]. With increasing surface excess the relative position between both elements approaches the expected order. In order to gain additional information on the surface structure, we have employed the perfectly surface sensitive electron spectroscopy MIES that characterizes exclusively the topmost layer of the liquid. As we suspect the asymmetric structure of POPC to play an important role, the behaviour of the analogues DPPC and DOPC in HPN is investigated by MIES as well.