Origin of iridescence in chiral nematic phase nanocrystalline cellulose for encryption and enhanced color

Yu Ping Zhang; Vamsy P. Chodavarapu; Andrew G. Kirk; Mark P. Andrews; Melodie Carluer; Gilles Picard

doi:10.1117/12.881492

2 February 2011 Origin of iridescence in chiral nematic phase nanocrystalline cellulose for encryption and enhanced color

Yu Ping Zhang, Vamsy P. Chodavarapu, Andrew G. Kirk, Mark P. Andrews, Melodie Carluer, Gilles Picard

Author Affiliations +

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.

Citation Download Citation

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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