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Mind the Microgap in Iridescent Cellulose Nanocrystal Films

Fernandes, Susete N.; Almeida, Pedro L.; Monge, Nuno; Aguirre, Luis E.; Reis, Dennys; Oliveira, Cristiano L. P. de; Neto, António M. F.; Pieranski, Pawel; Godinho, Maria H.

By 12 March 2019No Comments

Advanced Materials, 2017, vol 29, 2, pp. 1603560



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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