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DS: Dünne Schichten
DS 22: Postersitzung
DS 22.45: Poster
Dienstag, 9. März 2004, 14:30–17:00, Poster B
Surface Modification of Titanium Alloys by Phospholipid Membrane Systems — •D. Pressl1, G. Hlawacek1, C. Teichert1, F. Feyerabend2, R. Willumeit2, and H. Clemens3 — 1Department of Physics, University of Leoben, A-8700 Leoben, Austria — 2GKSS Research Center, 21502 Geesthacht, Germany — 3Dept. of Physical Metallurgy and Materials Testing, Universtiy of Leoben, A-8700 Leoben, Austria
High-resolution atomic force microscopy (AFM) is used to study the formation of solid-supported lipid bilayers on polished Ti6Al4V and Ti6Al7Nb samples. The resulting film morphology and the change of the surface roughness are investigated as a function of the initial roughness of the substrate.
The spontaneous deposition of liposomes in solution is characterized by the formation of a variety of regions with different film thickness and morphology. Areas with high lipid coverage show a higher roughness and the formation of dome structures. Areas with thinner coverage are characterized by the existence of a low number of bilayers showing terrace structures. The height of the single bilayers varies between 4 and 7 nm depending on hydration. Phase imaging proves the existence of single bilayers on the metal substrate. Furthermore, experiments in the fluid cell of an AFM are accomplished in order to allow direct comparisons to the results in the dry environment.