Berlin 2008 – wissenschaftliches Programm

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BP: Fachverband Biologische Physik

BP 26: Posters II

BP 26.9: Poster

Donnerstag, 28. Februar 2008, 17:00–19:30, Poster A

(Structure-) Mechanical properties of nanocoposite silk and wood at macro and molecular scales. — •Igor Krasnov¹, Imke Diddens¹, Tomasz Pazera¹, Sergio S. Funari², Richard Davies³, Manfred Burghammer³, and Martin Müller¹ — ¹Institut für Experimentelle und Angewandte Physik, Universität Kiel — ²Hasylab at Dasy, Hamburg — ³ESRF, Grenoble, France

Using an in situ combination of tensile tests and X*ray fiber diffraction, we have directly determined the mechanical roperties of both the crystalline and the disordered phase of the biological nanocomposite silk and wood.

The measurements at single fibers and bundels was done in controlled enviromental conditions such as temperature and humidity. We have adapted a model from linear viscoelastic theory, which fully accounts for the semicrystalline orphology of studying materials. The viscoelastic parameters (modulus, viscosity, relaxation times) were determined at a wide range of time scales.

The observed interplay of morphology, mechanical and enviromental properties will have strong impact on the design of novel high*performance nanocomposite fibers.