Berlin 2012 – scientific programme
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BP: Fachverband Biologische Physik
BP 10: Biopolymers and Biomaterials (with CPP)
BP 10.10: Talk
Tuesday, March 27, 2012, 12:15–12:30, H 1058
(contribution withdrawn) X-ray diffraction on biocomposite materials at high hydrostatic pressure — •Christina Krywka1, Roxana Ene2, Shin-Gyu Kang3, and Martin Müller3 — 1Christian-Albrechts-Universität zu Kiel, Institut für Experimentelle und Angewandte Physik, Leibnizstr. 19, D-24098 Kiel — 2Universität Leipzig, Fakultät für Physik und Geowissenschaften, Linnéstr. 5, 04103 Leipzig — 3Helmholtz Zentrum Geesthacht, Max-Planck-Str. 1, D-21502 Geesthacht
The anisotropic compressibilites of the crystalline fractions of biocomposite materials (spider silk, silkworm silk, cellulose etc.) were analysed using wide angle X-ray scattering (WAXS) at moderate high pressure (0.01 to 0.5 GPa) using a hydrostatic high pressure cell. With this method, the compression moduli of the biocomposite materials were determined for the first time with high pressure resolution in a pressure range that corresponds to loads as they occur under natural conditions. Exemplarily, for spider silk the compression modulus of the nanocrystals is proven to be highest in the direction of intra-sheet hydrogen bonds. In addition, it is found that the applied pressure may increase the organization of the amorphous phase, indicated by a pressure enhanced diffraction ring.