Diffraction from the beta-sheet crystallites in spider silk

Details Diffraction from the beta-sheet crystallites in spider silk Diffraction from the beta-sheet crystallites in spider silk

2008-11-25

arxiv.org/abs/0811.4157v1

Eur. Phys. J. E 27, p. 229-242 (2008)

Physics

Condensed Matter

Soft Condensed Matter

15 pages, 14 figures, on average 0.93 figures per page

Scientific paper

10.1140/epje/i2008-10374-7

We analyze the wide angle x-ray scattering from oriented spider silk fibers in terms of a quantitative scattering model, including both structural and statistical parameters of the $\beta$-sheet crystallites of spider silk in the amorphous matrix. The model is based on kinematic scattering theory and allows for rather general correlations of the positional and orientational degrees of freedom, including the crystallite's size, composition and dimension of the unit cell. The model is evaluated numerically and compared to experimental scattering intensities allowing us to extract the geometric and statistical parameters. We show explicitly that for the experimentally found mosaicity (width of the orientational distribution) inter-crystallite effects are negligible and the data can be analyzed in terms of single crystallite scattering, as is usually assumed in the literature.

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