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Self-Assembly of Cellulose Nanocrystals into Semi-Spherical Photonic Cholesteric Films

Journal Article · · Advanced Functional Materials

Spherical-shape cholesteric (Ch) photonic films offer promising applications such as omnidirectional lasing and broadband reflection. Here, a strategy is reported for the fabrication of photonic Ch films by the self-assembly of cellulose nanocrystals (CNCs) in semi-spherical cavities. It is shown that film structure and photonic properties are controlled by the film curvature, the composition of the precursor CNC suspension, and its liquid crystalline or isotropic state. The effect of curvature of the drying Ch-CNC films coupled with the restricted mobility of CNCs during film preparation results in the variation in pitch and helical axis inclination, thus leading to broadband reflectance properties of the films. The role of curvature of the Ch-CNC films is underlined by comparing their distinct properties with those of planar films with the same composition. We report these findings provide a novel insight into the design and development of biomimetic photonic Ch films.

Research Organization:
Univ. of Colorado, Boulder, CO (United States)
Sponsoring Organization:
Connaught Foundation; Natural Sciences and Engineering Research Council of Canada (NSERC); Fonds de recherche du Québec – Nature et technologies (FRQNT); Vanier Canada; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
Grant/Contract Number:
SC0010305
OSTI ID:
1611384
Alternate ID(s):
OSTI ID: 1471129
Journal Information:
Advanced Functional Materials, Journal Name: Advanced Functional Materials Journal Issue: 45 Vol. 28; ISSN 1616-301X
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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Angular optical response of cellulose nanocrystal films explained by the distortion of the arrested suspension upon drying text January 2019
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