Structure-property relationships in major ampullate spider silk as deduced from polarized FTIR spectroscopy.

Structure-property relationships in major ampullate spider silk as deduced from polarized FTIR spectroscopy. Research Abstract Details 

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Structure-property relationships in major ampullate spider silk as deduced from polarized FTIR spectroscopy. Abstract Text:

P Papadopoulos,J ,F Kremer,P Papadopoulos,J Sölter,F Kremer,

Polarized Fourier Transform Infrared (FTIR) spectroscopy is employed to study structure-property relationships in major ampullate spider silk being exposed to an external mechanical strain. From the measured infrared dichroism of aminoacid-residue - specific bands the molecular order parameter, the frequency width at half-maximum (FWHM) and the spectral position of the absorption maximum are determined in dependence on the external strain. For the highly ordered alanine-rich beta sheets a change in the vibrational potential is found for macroscopic strains as low as a few percent. It can be quantitatively described by a quantum-mechanical approach in which the mechanical strain is treated as a weak external perturbation. The immediate microscopic response to the external field proves that beta -sheeted crystals are tightly interconnected by pre-stretched chains as suggested recently (Y. Liu et al., Nat. Mater. 4, 901 (2005)).

Structure-property relationships in major ampullate spider silk as deduced from polarized FTIR spectroscopy. Publishing Authors By Initials

P Papadopoulos,J ,F Kremer,P Papadopoulos,J Sölter,F Kremer,

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Structure-property relationships in major ampullate spider silk as deduced from polarized FTIR spectroscopy. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: The European physical journal. E, Soft matter

VOLUME: 24

Page Numbers: 193-9

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ISSN: 1292-8941

DAY: 6

MONTH: 11

YEAR: 2007

Structure-property relationships in major ampullate spider silk as deduced from polarized FTIR spectroscopy. Information

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LANGUAGE: eng

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AFFILIATION: Institut für Experimentelle Physik I, Universität Leipzig, Leipzig, Germany. papadopoulos@physik.uni-leipzig.de

Country: France

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MEDLINETA: Eur Phys J E Soft Matter

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