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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 34: P6: Biomaterials and Biopolymers

CPP 34.2: Poster

Dienstag, 17. März 2015, 14:00–16:00, Poster C

A pressure-dependent FTIR-spectroscopy study on spider silk’s non-equilibrium nanostructure — •Arthur Markus Anton¹, Christof Gutsche², Wilhelm Kossack¹, and Friedrich Kremer¹ — ¹Institut für Experimentelle Physik I, Universität Leipzig, Germany — ²Poliklinik für Zahnerhaltung und Parodontologie, Universität Leipzig, Germany

To investigate the molecular structure and the interaction between internal and external constraints in spider silk a pressure dependent analysis by means of a diamond anvil cell (DAC) has been carried out. On the one hand, the spectral shift of a structure-specific IR-absorption band provides evidence of the inherent non-equilibrium nanostructure in spider silk, as composed of alanine-rich nanocrystals embedded in a glycine-rich and prestressed amorphous matrix [A. M. Anton et al., Macromol. 46 (2013)]. On the other hand, combining polarization-dependent IR-transmission and optical microscopy measurements allows for separating between order and disorder at macroscopic and microscopic scales for a variety of (bio)macromolecular fibers. Thus, on the example of spider silk the molecular order parameter of the alanine building blocks is determined and found to decrease reversibly by 0.01 GPa⁻¹ when varying the external hydrostatic pressure between 0 and 3 GPa [A. M. Anton et al., manuscript submitted].