Dresden 2011 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 19: Poster: Interfaces and Thin Films
CPP 19.14: Poster
Dienstag, 15. März 2011, 18:00–20:00, P2
Biomineralisation of iron oxides under lipid monolayers studied by x-ray scattering experiments — •Steffen Bieder1, Florian Wieland1, Patrick Degen2, Michael Paulus1, Martin Schroer1, Christoph Sahle1, Johannes Möller1, 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
Biomineralisation processes provide composite materials which show hierarchical organization as well as complex and controlled shapes. The biomineralisation processes in living organisms are controlled by proteins and the environment where the process takes place, e.g., the inner cell or the surface of membranes. We studied the biomineralisation 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 mineralisation process. The adsorption of iron oxide at the monolayers was observed by grazing incidence diffraction (GID) and extended x-ray absorption spectroscopy (EXAFS). The GID and EXAFS data show an agglomeration of iron oxides at the monolayers. The coordination of the forming iron oxides were similar to the coordination of lepidocrocite and goethite.