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Orientational mapping augmented sub-wavelength hyper-spectral imaging of silk

Ryu, Meguya, Balčytis, Armandas, Wang, Xuewen, Vongsvivut, Jitraporn, Hikima, Yuta, Li, Jingliang, Tobin, Mark J., Juodkazis, Saulius and Morikawa, Junko 2017, Orientational mapping augmented sub-wavelength hyper-spectral imaging of silk, Scientific reports, vol. 7, no. 1, doi: 10.1038/s41598-017-07502-3.

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Title Orientational mapping augmented sub-wavelength hyper-spectral imaging of silk
Author(s) Ryu, Meguya
Balčytis, Armandas
Wang, Xuewen
Vongsvivut, Jitraporn
Hikima, Yuta
Li, JingliangORCID iD for Li, Jingliang orcid.org/0000-0003-0709-2246
Tobin, Mark J.
Juodkazis, Saulius
Morikawa, Junko
Journal name Scientific reports
Volume number 7
Issue number 1
Article ID 7419
Total pages 10
Publisher Nature Publishing Group
Place of publication London, Eng.
Publication date 2017-08-07
ISSN 2045-2322
2045-2322
Keyword(s) Science & Technology
Multidisciplinary Sciences
Science & Technology - Other Topics
AMPULLATE SPIDER SILK
BETA-SHEET CRYSTALS
X-RAY MICROSCOPY
BOMBYX-MORI SILK
MOLECULAR-ORIENTATION
INFRARED-SPECTROSCOPY
MECHANICAL-PROPERTIES
SECONDARY STRUCTURE
THERMAL CONDUCTION
FTIR SPECTROSCOPY
Summary Molecular alignment underpins optical, mechanical, and thermal properties of materials, however, its direct measurement from volumes with micrometer dimensions is not accessible, especially, for structurally complex bio-materials. How the molecular alignment is linked to extraordinary properties of silk and its amorphous-crystalline composition has to be accessed by a direct measurement from a single silk fiber. Here, we show orientation mapping of the internal silk fiber structure via polarisation-dependent IR absorbance at high spatial resolution of 4.2 μm and 1.9 μm in a hyper-spectral IR imaging by attenuated total reflection using synchrotron radiation in the spectral fingerprint region around 6 μm wavelength. Free-standing longitudinal micro-slices of silk fibers, thinner than the fiber cross section, were prepared by microtome for the four polarization method to directly measure the orientational sensitivity of absorbance in the molecular fingerprint spectral window of the amide bands of β-sheet polypeptides of silk. Microtomed lateral slices of silk fibers, which may avoid possible artefacts that affect spectroscopic measurements with fibers of an elliptical cross sections were used in the study. Amorphisation of silk by ultra-short laser single-pulse exposure is demonstrated.
Language eng
DOI 10.1038/s41598-017-07502-3
Field of Research 020401 Condensed Matter Characterisation Technique Development
091205 Functional Materials
Socio Economic Objective 970102 Expanding Knowledge in the Physical Sciences
Copyright notice ©2017, The Authors
Free to Read? Yes
Use Rights Creative Commons Attribution licence
Persistent URL http://hdl.handle.net/10536/DRO/DU:30102240

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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.