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Determination of the Complete Elasticity of Nephila pilipes Spider Silk.

07:00 EST 14th January 2020 | BioPortfolio

Summary of "Determination of the Complete Elasticity of Nephila pilipes Spider Silk."

Spider silks are remarkable materials designed by nature to have extraordinary elasticity. Their elasticity, however, remains poorly understood as typical stress-strain experiments only allow access to the axial Young's modulus. In this work, micro-Brillouin light spectroscopy (micro-BLS), a non-contact, non-destructive technique, is utilized to probe the direction-dependent phonon propagation in the Nephila pilipes spider silk and hence solve its full elasticity. To the best of our knowledge, this is the first demonstration on the determination of the anisotropic Young's moduli, shear moduli, and Poisson's ratios of a single spider fiber. The axial and lateral Young's moduli are found to be 20.9 ± 0.8 and 9.2 ± 0.3 GPa, respectively, and the anisotropy of the Young's moduli further increases upon stretching. In contrast, the shear moduli and Poisson's ratios exhibit very weak anisotropy, and are robust to stretching.

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This article was published in the following journal.

Name: Biomacromolecules
ISSN: 1526-4602
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Medical and Biotech [MESH] Definitions

Fibrous proteins secreted by INSECTS and SPIDERS. Generally, the term refers to silkworm fibroin secreted by the silk gland cells of SILKWORMS, Bombyx mori. Spider fibroins are called spidroins or dragline silk fibroins

A serine-rich sticky protein secreted by MOTHS. Generally, the term refers to silkworm silk gum protein secreted in the middle section of silk gland cells of SILKWORMS, Bombyx mori. Sericin acts as a cement and coating for the two fibroin filaments in a silk strand and is readily soluble in mild alkaline solution.

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