Mind the Microgap in Iridescent Cellulose Nanocrystal Films.

Fernandes, Susete N; Almeida, Pedro L; Monge, Nuno; Aguirre, Luis E; Reis, Dennys; de Oliveira, Cristiano L P; Neto, António M F; Pieranski, Pawel et al. · Adv Mater · 2017

basic_science · Level V

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Record sourced from PubMed, PMID 27862372.
Also identified by DOI 10.1002/adma.201603560.
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Abstract

A new photonic structure is produced from cellulose nanocrystal iridescent films reflecting both right and left circularly polarized light. Micrometer-scale planar gaps perpendicular to the films' cross-section between two different left-handed films' cholesteric domains are impregnated with a nematic liquid crystal. This photonic feature is reversibly tuned by the application of an electric field or a temperature variation.

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