Please use this identifier to cite or link to this item: https://doi.org/10.1002/adfm.201001397
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dc.titleStructural origin of the strain-hardening of spider silk
dc.contributor.authorDu, N.
dc.contributor.authorYang, Z.
dc.contributor.authorLiu, X.Y.
dc.contributor.authorLi, Y.
dc.contributor.authorXu, H.Y.
dc.date.accessioned2014-10-16T09:42:31Z
dc.date.available2014-10-16T09:42:31Z
dc.date.issued2011-02-22
dc.identifier.citationDu, N., Yang, Z., Liu, X.Y., Li, Y., Xu, H.Y. (2011-02-22). Structural origin of the strain-hardening of spider silk. Advanced Functional Materials 21 (4) : 772-778. ScholarBank@NUS Repository. https://doi.org/10.1002/adfm.201001397
dc.identifier.issn1616301X
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/98059
dc.description.abstractSpider dragline silk, as a type of high-performance natural fiber, displays a unique combination of tensile strength and extensibility that gives rise to a greater toughness than any other natural or synthetic fiber. In contrast to silkworm silk, spider dragline silk displays a remarkable strain-hardening character for which the origin remains unknown. In this paper, the performance of silkworm silk and spider dragline fibers under stretching is compared based on a combined structural and mechanical analysis. The molecular origin of the strain-hardening of spider silk filaments is addressed in comparison to rubber and Kevlar. Unlike rubber, the occurrence of strain-hardening can be attributed to the unfolding of the intramolecular β-sheets in spider silk fibrils, which serve as "molecular spindles" to store lengthy molecular chains in space compactly. With the progressive unfolding and alignment of protein during fiber extension, protein backbones and nodes of the molecular network are stretched to support the load. Consequently the dragline filaments become gradually hardened, enabling efficient energy buffering when an abseiling spider escapes from a predator. As distinct from synthetic materials such as rubber (elastomers), this particular structural feature of spider draglines not only enables quick energy absorption, but also efficiently suppresses the drastic oscillation which occurs upon an impact. The mimicking of this strain-hardening character of spider silk will give rise to the design and fabrication of new advanced functional materials with applications in kinetic energy buffering and absorption. The structural response of spider dragline fiber to stretching is distinct from that of silkworm silk. The unfolding of the intramolecular β-sheets in spider silk fibrils gives rise to strain-hardening behavior, enabling efficient energy buffering and absorption when an abseiling spider escapes from a predator. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1002/adfm.201001397
dc.sourceScopus
dc.subjectβ-sheets
dc.subjectmechanical properties
dc.subjectsilk
dc.subjectstrain-hardening
dc.typeArticle
dc.contributor.departmentPHYSICS
dc.description.doi10.1002/adfm.201001397
dc.description.sourcetitleAdvanced Functional Materials
dc.description.volume21
dc.description.issue4
dc.description.page772-778
dc.description.codenAFMDC
dc.identifier.isiut000287667800019
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