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- Title
Silk: Optical Properties over 12.6 Octaves THz-IR-Visible-UV Range.
- Authors
Balčytis, Armandas; Meguya Ryu; Xuewen Wang; Novelli, Fabio; Seniutinas, Gediminas; Shan Du; Xungai Wang; Jingliang Li; Davis, Jeffrey; Appadoo, Dominique; Morikawa, Junko; Juodkazis, Saulius
- Abstract
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 x 10³ cm-1 (λ = 200 nm, f = 1500 THz) wavelengths or over a 12.6 octave frequency range. Spectral features at β-sheet, &#+945;-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.
- Subjects
SILK fibroin; WAVELENGTHS; SPATIAL distribution (Quantum optics); ELECTRO-optical effects; ANIMAL fibers
- Publication
Materials (1996-1944), 2017, Vol 10, Issue 4, p356
- ISSN
1996-1944
- Publication type
Article
- DOI
10.3390/ma10040356