Ultra strong pyroprotein fibres with long-range ordering
- Authors
- Cho, S.Y.; Yun, Y.S.; Jang, D.; Jeon, J.W.; Kim, B.H.; Lee, S.; Jin, H.-J.
- Issue Date
- 2017
- Publisher
- Nature Publishing Group
- Citation
- Nature Communications, v.8, no.1
- Indexed
- SCIE
SCOPUS
- Journal Title
- Nature Communications
- Volume
- 8
- Number
- 1
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/86124
- DOI
- 10.1038/s41467-017-00132-3
- ISSN
- 2041-1723
- Abstract
- Silks are protein-based natural structured materials with an unusual combination of high strength and elongation. Their unique microstructural features composed of hard β-sheet crystals aligned within a soft amorphous region lead to the robust properties of silks. Herein we report a large enhancement in the intrinsic properties of silk through the transformation of the basic building blocks into a poly-hexagonal carbon structure by a simple heat treatment with axial stretching. The carbon clusters originating from the β-sheet retain the preferred orientation along the fibre axis, resulting in a long-range-ordered graphitic structure by increasing heat-treatment temperatures and leading improvements in mechanical properties with a maximum strength and modulus up to ∼2.6 and ∼470 GPa, respectively, almost four and thirty times surpassing those of raw silk. Moreover, the formation of sp 2 carbon configurations induce a significant change in the electrical properties (e.g. an electrical conductivity up to 4.37 × 103 S cm-1). © 2017 The Author(s).
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Collections - Graduate School > KU-KIST Graduate School of Converging Science and Technology > 1. Journal Articles
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