Use of extension-deformation-based crystallisation of silk fibres to differentiate their functions in nature

Keiji Numata, Hiroyasu Masunaga, Takaaki Hikima, Sono Sasaki, Kazuhide Sekiyama, Masaki Takata

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

β-Sheet crystals play an important role in determining the stiffness, strength, and optical properties of silk and in the exhibition of silk-type-specific functions. It is important to elucidate the structural changes that occur during the stretching of silk fibres to understand the functions of different types of fibres. Herein, we elucidate the initial crystallisation behaviour of silk molecules during the stretching of three types of silk fibres using synchrotron radiation X-ray analysis. When spider dragline silk was stretched, it underwent crystallisation and the alignment of the β-sheet crystals became disordered initially but was later recovered. On the other hand, silkworm cocoon silk did not exhibit further crystallisation, whereas capture spiral silk was predominantly amorphous. Structural analyses showed that the crystallisation of silks following extension deformation has a critical effect on their mechanical and optical properties. These findings should aid the production of artificial silk fibres and facilitate the development of silk-inspired functional materials.

Original languageEnglish
Pages (from-to)6335-6342
Number of pages8
JournalSoft Matter
Volume11
Issue number31
DOIs
Publication statusPublished - 2015 Aug 21
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics

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