Issue 29, 2022

Nanovoid formation induces property variation within and across individual silkworm silk threads

Abstract

Silk is a unique fiber, having a strength and toughness that exceeds other natural fibers. While inroads have been made in our understanding of silkworm silk structure and function, few studies have measured structure and function at nanoscales. As a consequence, the sources of variation in mechanical properties along single silk fibers remain unresolved at multiple scales. Here we utilized state of the art spectroscopic and microscopic methodologies to show that the silks of species of wild and domesticated silkworms vary in mechanical properties along a single fiber and, what is more, this variation correlates with nanoscale void formations. These results can also explain the strain hardening behaviours observed in the silks where structural features of the proteins could not. We thereupon devised a predictive thermal model and showed that the voids contribute to temperature regulation within the silkworm cocoons.

Graphical abstract: Nanovoid formation induces property variation within and across individual silkworm silk threads

Supplementary files

Article information

Article type
Paper
Submitted
17 Feb 2022
Accepted
30 Mar 2022
First published
31 Mar 2022

J. Mater. Chem. B, 2022,10, 5561-5570

Nanovoid formation induces property variation within and across individual silkworm silk threads

H. C. Craig, Y. Yao, N. Ariotti, M. Setty, R. Remadevi, M. M. Kasumovic, R. Rajkhowa, A. Rawal and S. J. Blamires, J. Mater. Chem. B, 2022, 10, 5561 DOI: 10.1039/D2TB00357K

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