Ultra strong pyroprotein fibres with long-range ordering

Title
Ultra strong pyroprotein fibres with long-range ordering
Authors
이성호조세연장다원윤영수전준우김병훈진형준
Keywords
carbon fiber; silk fiber; pyroprotein; tensile strength
Issue Date
2017-07
Publisher
Nature Communications
Citation
VOL 8, NO 74-7
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 sp2 carbon configurations induce a significant change in the electrical properties (e.g. an electrical conductivity up to 4.37 × 103 S cm− 1).
URI
http://pubs.kist.re.kr/handle/201004/65922
ISSN
2041-1723
Appears in Collections:
KIST Publication > Article
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