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Silk: optical properties over 12.6 octaves THz-IR-visible-UV range

Balčytis, Armandas, Ryu, Meguya, Wang, Xuewen, Novelli, Fabio, Seniutinas, Gediminas, Du, Shan, Wang, Xungai, Li, Jingliang, Davis, Jeffrey, Appadoo, Dominique, Morikawa, Junko and Juodkazis, Saulius 2017, Silk: optical properties over 12.6 octaves THz-IR-visible-UV range, Materials, vol. 10, no. 4, pp. 1-15, doi: 10.3390/ma10040356.

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Title Silk: optical properties over 12.6 octaves THz-IR-visible-UV range
Author(s) Balčytis, Armandas
Ryu, Meguya
Wang, Xuewen
Novelli, Fabio
Seniutinas, Gediminas
Du, Shan
Wang, Xungai
Li, JingliangORCID iD for Li, Jingliang orcid.org/0000-0003-0709-2246
Davis, Jeffrey
Appadoo, Dominique
Morikawa, Junko
Juodkazis, Saulius
Journal name Materials
Volume number 10
Issue number 4
Article ID 356
Start page 1
End page 15
Total pages 15
Publisher MDPI AG
Place of publication Basel, Switzerland
Publication date 2017-04
ISSN 1996-1944
Keyword(s) silk
fibroin
biopolymer
terahertz
spectroscopy
solubility
proteins
biodegradable polymers
Summary Domestic (Bombyx mori) and wild (Antheraea pernyi) silk fibers were characterised over a wide spectral range from THz 8 cm −1 ( λ= 1.25 mm, f= 0.24 THz) to deep-UV 50×103 cm −1 ( λ= 200 nm, f= 1500 THz) wavelengths or over a 12.6 octave frequency range. Spectral features at β-sheet, α-coil and amorphous fibroin were analysed at different spectral ranges. Single fiber cross sections at mid-IR were used to determine spatial distribution of different silk constituents and revealed an α-coil rich core and more broadly spread β-sheets in natural silk fibers obtained from wild Antheraea pernyi moths. Low energy T-ray bands at 243 and 229 cm −1 were observed in crystalline fibers of domestic and wild silk fibers, respectively, and showed no spectral shift down to 78 K temperature. A distinct 20±4 cm−1 band was observed in the crystalline Antheraea pernyi silk fibers. Systematic analysis and assignment of the observed spectral bands is presented. Water solubility and biodegradability of silk, required for bio-medical and sensor applications, are directly inferred from specific spectral bands.
Language eng
DOI 10.3390/ma10040356
Field of Research 099999 Engineering not elsewhere classified
03 Chemical Sciences
09 Engineering
Socio Economic Objective 970110 Expanding Knowledge in Technology
HERDC Research category C1 Refereed article in a scholarly journal
Grant ID ARC DP130101205
JSPS KAKENHI 16K06768
Copyright notice ©2017, The Authors
Free to Read? Yes
Use Rights Creative Commons Attribution licence
Persistent URL http://hdl.handle.net/10536/DRO/DU:30094363

Document type: Journal Article
Collections: Institute for Frontier Materials
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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.