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2 February 2011 Origin of iridescence in chiral nematic phase nanocrystalline cellulose for encryption and enhanced color
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Proceedings Volume 7955, Emerging Liquid Crystal Technologies VI; 79550V (2011) https://doi.org/10.1117/12.881492
Event: SPIE OPTO, 2011, San Francisco, California, United States
Abstract
Nano Crystalline Cellulose (NCC) in aqueous suspension gives rise to anisotropic order that leads to iridescence from the fluid phase. Phase separation and order formation were studied using polarized optical microscopy and laser diffraction. Factors affecting liquid crystal phase separation, such as hydrolysis time, wood pulp species, sonication are discussed. Long range order and a physical grating structure are important to produce iridescence in the bulk fluid liquid crystal phase Stereomicroscopy showed that retardation lines propagate through the bulk of the fluid. Laser diffraction light experiments reveal features of the time evolution of the bulk grating. The grating structure may be used as tool to cast a chiral iridescence grating for security applications.
© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Yu Ping Zhang, Vamsy P. Chodavarapu, Andrew G. Kirk, Mark P. Andrews, Melodie Carluer, and Gilles Picard "Origin of iridescence in chiral nematic phase nanocrystalline cellulose for encryption and enhanced color", Proc. SPIE 7955, Emerging Liquid Crystal Technologies VI, 79550V (2 February 2011); https://doi.org/10.1117/12.881492
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