Regensburg 2004 – wissenschaftliches Programm
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AKB: Biologische Physik
AKB 50: Poster Session "Biological Physics"
AKB 50.71: Poster
Freitag, 12. März 2004, 10:30–13:00, B
Small Angle X-ray Scattering (SAXS) of Novel Pd Bionanocatalysts — •Barbara Aichmayer1,2, Ingomar Jäger2, Michael Mertig3, Oskar Paris4, and Peter Fratzl4 — 1Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Leoben, Austria — 2Institute of Metal Physics, University of Leoben, Austria — 3IfWW, University of Technology, Dresden, Germany — 4Max-Planck-Institute of Colloids and Interfaces, Department of Biomaterials, Potsdam, Germany
We investigate new bionanocatalysts which are produced using biotechnology: two-dimensional S-layer protein crystals serve as templates for the deposition of Pd crystals. Structural investigations of the Pd particles were carried out in order to optimise the catalysts and to find out how the biological templates affect the precipitation of Pd. By means of SAXS the specific surface and size of the Pd particles were evaluated. Correlations between the specific surface and the catalytic activity were proven. Indications for a change of the S-layer protein structure caused by the metal loading were observed. Furthermore, it was shown that the particle formation is affected by synchrotron radiation (SR). Pd clusters with a diameter of 2-3 nm were built in the synchrotron beam. Although the amount of these particles increased with increasing exposure time to SR, no coarsening of the particles occurred. From this behaviour we conclude that the nanoclusters are stabilized by the protein which prevents further growth of the Pd particles.
This work is supported by the European Union Grant number GRD1-2001-40424.