du-silkoptical-2017.pdf (2.35 MB)
Silk: optical properties over 12.6 octaves THz-IR-visible-UV range
journal contribution
posted on 2017-04-01, 00:00 authored by A Balčytis, M Ryu, X Wang, F Novelli, G Seniutinas, Shan Du, Xungai Wang, Jingliang LiJingliang Li, J Davis, D Appadoo, J Morikawa, S JuodkazisDomestic (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 × 10 3 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.
History
Journal
MaterialsVolume
10Issue
4Article number
356Pagination
1 - 15Publisher
MDPI AGLocation
Basel, SwitzerlandPublisher DOI
eISSN
1996-1944Language
engGrant ID
DP130101205Notes
This work was part of the Melbourne synchrotron beamtime proposal 10457, experiments carried out from 19 to 21 April 2016. Meguya Ryu is grateful for the travel grant from the Tokyo Institute of Technology. Junko Morikawa acknowledges the support of JSPS KAKENHI Grant No. 16K06768 and the support in part by “Materials research by Information Integration” Initiative (MI2I) project of the Support Program for the Starting Up Innovation Hub from the Japan Science and Technology Agency (JST). Saulius Juodkazis is grateful for partial support via the Australian Research Council DP130101205 Discovery project, Swinburne’s startup grant for nanotechnology facility, and by the nanotechnology Ambassador fellowship program at the Melbourne Centre for Nanofabrication (MCN) in the Victorian Node of the Australian National Fabrication Facility (ANFF)Publication classification
C1 Refereed article in a scholarly journalCopyright notice
2017, The AuthorsUsage metrics
Categories
No categories selectedKeywords
silkfibroinbiopolymerterahertzspectroscopysolubilityproteinsbiodegradable polymersScience & TechnologyPhysical SciencesTechnologyChemistry, PhysicalMaterials Science, MultidisciplinaryMetallurgy & Metallurgical EngineeringPhysics, AppliedPhysics, Condensed MatterChemistryMaterials SciencePhysicsENHANCED RAMAN-SCATTERINGFAR-INFRARED SPECTROSCOPYANTHERAEA-PERNYI SILKTEMPERATURE-DEPENDENCEROTATOR PHASEWATERPEPTIDESFIBERBIOMATERIALS