Regensburg 2007 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 35: SYBM Bioinspired Materials

MM 35.5: Vortrag

Donnerstag, 29. März 2007, 16:00–16:15, H16

Structure and dynamics of biological materials — •Martin Müller — Institut für Experimentelle und Angewandte Physik, Christian–Albrechts–Universität zu Kiel

Almost all biological materials are hierarchically structured on many different length scales. On a mesoscopic level, usually a composite morphology with nanocrystalline regions embedded in a softer, disordered matrix is found. The matrix is accessible to water, and the water content is of major influence on the mechanical properties of biomaterials.

We investigate structural changes of biomaterials (cellulose fibres, wood and particularly silkworm silk) under mechanical load in in situ X–ray scattering experiments with microbeam synchrotron radiation. A novel sample environment allows us to systematically vary the water content of the samples. The soft, water–accessible matrix plays an important role in the microscopic model we obtain for deformation mechanisms in dry and wet biomaterials [1].

The combination of the X–ray results with those from the complementary technique of inelastic neutron scattering allowed us to develop a deeper understanding of the interplay of crystalline and disordered regions in silkworm silk [2].
[1] I. Grotkopp, PhD thesis, Kiel, 2006.
[2] T. Seydel, K. Kölln, I. Krasnov, I. Diddens, N. Hauptmann, G. Helms, M. Ogurreck, S.–G. Kang, M. M. Koza, M. Müller, Macromolecules, in press.