期刊
ACS APPLIED NANO MATERIALS
卷 1, 期 5, 页码 2175-2183出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.8b00233
关键词
cellulose nanocrystals; film; selective reflection; chiral nematic; helix defect
资金
- National Science Foundation (NSF) CBET [1437073]
- Auburn University Research Initiative on Cancer Graduate Fellowship
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1436637, 1437073] Funding Source: National Science Foundation
Above a critical concentration, aqueous dispersions of sulfonated cellulose nanocrystals (CNC) form chiral nematic liquid crystalline phases. Retention of microstructural order and planar anchoring of the helix during drying should result in films that exhibit selective reflection of specific wave-lengths of light. Such films are of interest for use in a variety of photonic applications including display components, narrow band optical filters, low-threshold mirrorless lasing, sensors, and architectural, decorative, and security coatings. However, nonuniformities in the initial CNC dispersions and micro structural changes during drying typically result in uniform selective reflection only being achieved over length scales on the order of tens of microns. In this research, uniform photonic properties were achieved over orders of magnitude greater length scales by understanding the effects of initial concentration, orbital shear, surface anchoring, and drying conditions on films' microstructure and photonic properties. In addition, biomimetic films were produced which exhibited a double-peak spectra similar to that exhibited by the chiral nematic photonic structure in Lomaptera beetles.
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