Berlin 2012 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 13: Poster: Interfaces and Thin Films
CPP 13.19: Poster
Dienstag, 27. März 2012, 18:15–20:45, Poster A
Mineralisation of iron oxides under lipid monolayers studied by x-ray scattering experiments — •Steffen Bieder1, Florian Wieland1, Patrick Degen2, Michael Paulus1, Martin Schroer1, Johannes Möller1, Christoph Sahle1, Ralph Wagner3, Heinz Rehage2, and Metin Tolan1 — 1Fakultät Physik/DELTA, TU Dortmund, Maria-Goeppert-Mayer-Str. 2, D-44227 Dortmund — 2Physikalische Chemie II, TU Dortmund, Otto-Hahn-Str. 6, D-44227 Dortmund — 3Fakultät Physik, Bergische Universität Wuppertal, Gaußstr. 20, D-42097 Wuppertal
Composite materials formed by nature show a hierarchically organized and complex structure. The biomineralization processes in living organisms are controlled by proteins and the environment where the process takes place, e.g., the cell interia or the surface of membranes. We studied the mineralization of iron oxide in-situ at the aqueous solution/air interface. As a model system for membranes in living cells we used Langmuir layers consisting of lipids with differently charged headgroups in order to investigate the influence of electrostatic interactions on the mineralization process. The adsorption of iron oxide at the monolayers was observed by grazing incidence diffraction (GID) and extended x-ray absorption fine structure (EXAFS) spectroscopy. We also studied the mineralization with x-ray reflectivity (XRR) experiments at the liquid-liquid interface. The extracted data show an agglomeration of iron oxides at the monolayers. The formation of the growing iron oxides were similar to the formation of lepidocrocite and goethite.