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Proceedings Paper

Nano-structured wild moth cocoon fibers as radiative cooling and waveguiding optical materials
Author(s): Norman Nan Shi; Cheng-Chia Tsai; Gary D. Bernard; Catherine Craig; Nanfang Yu
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Paper Abstract

The study shows that comet moth cocoon fibers exhibit radiative cooing properties with enhanced solar reflectivity and thermal emissivity. Nanostructured voids inside the cocoon fiber enables the cocoons to exhibit strong scattering in the visible and near-infrared. These structures also allow the fibers to exhibit strong shape birefringence and directional reflectivity. Optical waveguiding due to transverse Anderson localization is observed in these natural fibers, where the invariance and large concentration of the voids in the longitudinal direction allow the fiber to confine light in the transverse direction. To mimic the optical effects generated by these natural silk fibers, nanostructured voids are introduced into regenerated silk fibers through wet spinning to enhance reflectivity in the solar spectrum.

Paper Details

Date Published: 6 September 2017
PDF: 8 pages
Proc. SPIE 10367, Light in Nature VI, 1036708 (6 September 2017); doi: 10.1117/12.2273586
Show Author Affiliations
Norman Nan Shi, Columbia Univ. (United States)
Cheng-Chia Tsai, Columbia Univ. (United States)
Gary D. Bernard, Univ. of Washington (United States)
Catherine Craig, Harvard Univ. (United States)
Nanfang Yu, Columbia Univ. (United States)

Published in SPIE Proceedings Vol. 10367:
Light in Nature VI
Joseph A. Shaw; Katherine Creath; Vasudevan Lakshminarayanan, Editor(s)

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