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  Self-healing silk from the sea : role of helical hierarchical structure in Pinna nobilis byssus mechanics

Pasche, D., Horbelt, N., Marin, F., Motreuil, S., Fratzl, P., & Harrington, M. J. (2019). Self-healing silk from the sea: role of helical hierarchical structure in Pinna nobilis byssus mechanics. Soft Matter, 15(47), 9654-9664. doi:10.1039/C9SM01830A.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-61C0-4 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-7649-5
Genre: Journal Article

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Pasche, Delphine1, Author              
Horbelt, Nils1, Author              
Marin, Frédéric, Author
Motreuil, Sébastien, Author
Fratzl, Peter2, Author              
Harrington, Matthew J.1, Author              
Affiliations:
1Matthew Harrington, Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863292              
2Peter Fratzl, Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863294              

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 Abstract: The byssus fibers of Mytilus mussel species have become an important role model in bioinspired materials research due to their impressive properties (e.g. high toughness, self-healing); however, Mytilids represent only a small subset of all byssus-producing bivalves. Recent studies have revealed that byssus from other species possess completely different protein composition and hierarchical structure. In this regard, Pinna nobilis byssus is especially interesting due to its very different morphology, function and its historical use for weaving lightweight golden fabrics, known as sea silk. P. nobilis byssus was recently discovered to be comprised of globular proteins organized into a helical protein superstructure. In this work, we investigate the relationships between this hierarchical structure and the mechanical properties of P. nobilis byssus threads, including energy dissipation and self-healing capacity. To achieve this, we performed in-depth mechanical characterization, as well as tensile testing coupled with in situ X-ray scattering. Our findings reveal that P. nobilis byssus, like Mytilus, possesses self-healing and energy damping behavior and that the initial elastic behavior of P. nobilis byssus is due to stretching and unraveling of the previously observed helical building blocks comprising the byssus. These findings have biological relevance for understanding the convergent evolution of mussel byssus for different species, and also for the field of bio-inspired materials.

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Language(s): eng - English
 Dates: 2019-11-072019
 Publication Status: Published in print
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 Identifiers: DOI: 10.1039/C9SM01830A
PMID: 0577
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Title: Soft Matter
Source Genre: Journal
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Publ. Info: Cambridge, UK : Royal Society of Chemistry
Pages: - Volume / Issue: 15 (47) Sequence Number: - Start / End Page: 9654 - 9664 Identifier: ISSN: 1744-683X