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Mind the Microgap in Iridescent Cellulose Nanocrystal Films
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Orientador(es)
Resumo(s)
Researchers reported a new cellulose-based photonic structure, which reflected both right circularly polarized (RCP) and left circularly polarized (LCP) light that can be tuned by temperature variation and the application of an external electric field. The optical properties of the cellulose nanocrystal (CNC) samples were investigated both in terms of their microstructure by scanning electron microscopy (SEM), small-angle X-ray scattering (SAXS) and spectroscopically, using circularly and linear polarized light coupled with a polarized optical microscope (POM). The nanocrystals used in this work were prepared by acid hydrolysis of microcrystalline cellulose. Aqueous suspensions of CNCs in the acid form were used, resulting in freestanding iridescent films after drying with colors depending on the viewing angle.
Descrição
This work was funded by FEDER funds through the COMPETE 2020 Program and National Funds through FCT - Portuguese Foundation for Science and Technology under the Projects No, PTDC/FIS-NAN/0117/2014, and PTDC/CTM-BIO/6178/2014.
S.N.F. acknowledges the Minister of Science, Technology and Higher Education for National Funds, European Social Funds and FCT for fellowship number SFRH/BDP/78430/2011.
The authors also acknowledge FAPESP, CNPq, INCT-FCx from Brazil.
Palavras-chave
cellulose nanocrystals liquid crystals mimicking Plusiotis resplendens cuticles photonics General Materials Science Mechanics of Materials Mechanical Engineering