Dresden 2011 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 3: Interfaces and Thin Films I
CPP 3.8: Vortrag
Montag, 14. März 2011, 12:15–12:30, ZEU 160
Biomimetic crystalization of iron oxides at liquid interfaces studied by x-ray scattering experiments — •Florian Wieland1, Patrick Degen2, Steffen Bieder1, Michael Paulus1, Martin Schroer1, Christoph Sahle1, Johannes Möller1, Heinz Rehage2, and Metin Tolan1 — 1Fakultät Physik/DELTA, Technische Universität Dortmund, Otto-Hahn-Str. 4, 44227 Dortmund, Germany — 2Fakultät Chemie, Technische Universität Dortmund, Otto-Hahn-Str. 6, 44227 Dortmund, Germany
Biomineralization processes provide composite materials which show a hierarchical organization, complex and controlled shapes. In living organisms the biomineralization process is controlled by complex biological mechanisms and by the environment where the process takes place. We have investigated in-situ the mineralization of iron oxide at Langmuir monolayers at the aqueous solution-air interface. Information on the vertical density profile were obtained by x-ray reflectivity measurements where the structural evolution of the mineral layer could be observed. Furthermore grazing incidence diffraction measurements were performed in order to evaluate the crystal structure of the iron oxide and the lateral structure of the Langmuir layer. For the investigation of the local structure of the forming film surface sensitive extended x-ray absorption fine structure measurements were performed. The formation of a thin amorphous layer of iron oxide under Langmuir monolayers which posses a negative or positive headgroup was observed. The EXAFS data show that the iron coordination is similar to the coordination in maghemite, but without long range ordering.