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. 2022 Apr 11;14(8):1546. doi: 10.3390/polym14081546

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© 2022 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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(a) A cholesteric CNC film’s structure and optical characteristics. (b) Photograph of chiral nematic CNC film displaying structural color iridescence. (c) Scanning electron micrograph of CNC in a film with a helical twist. The helical pitch is schematically represented in the dashed-line inset (P). (d) A typical cholesteric CNC film’s circular dichroism spectrum. Natural light (left), left-handed circularly polarized light (center), and right-handed circularly polarized light (right) views of chiral nematic CNC film (right). Reproduced from [81].