Robust Chiral Organization of Cellulose Nanocrystals in Capillary Confinement

被引:71
作者
Cherpak, V. [1 ]
Korolovych, V. F. [1 ]
Geryak, R. [1 ]
Turiv, T. [2 ,3 ]
Nepal, D. [4 ]
Kelly, J. [4 ]
Bunning, T. J. [4 ]
Lavrentovich, O. D. [2 ,3 ,5 ]
Heller, W. T. [6 ]
Tsukruk, V. V. [1 ]
机构
[1] Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA
[2] Kent State Univ, Liquid Crystal Inst, Kent, OH 44240 USA
[3] Kent State Univ, Chem Phys Interdisciplinary Program, Kent, OH 44240 USA
[4] US Air Force, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA
[5] Kent State Univ, Dept Phys, Kent, OH 44240 USA
[6] Oak Ridge Natl Lab, Neutron Scattering Div, Oak Ridge, TN 37831 USA
基金
美国国家科学基金会;
关键词
Cellulose nanocrystals; liquid crystal phase; chiral nematic formation; real-time monitoring; SMALL-ANGLE NEUTRON; LIQUID-CRYSTALLINE; AQUEOUS SUSPENSIONS; PHASE-SEPARATION; DRYING KINETICS; POLARIZED-LIGHT; X-RAY; FILMS; SCATTERING; TRANSFORMATION;
D O I
10.1021/acs.nanolett.8b02522
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
We showed large area uniformly aligned chiral photonic bioderived films from a liquid crystal phase formed by a cellulose nanocrystal (CNC) suspension placed in a thin capillary. As a result of the spatial confinement of the drying process, the interface between coexisting isotropic and chiral phases aligns perpendicular to the long axis of the capillary. This orientation facilitates a fast homogeneous growth of chiral pseudolayers parallel to the interface. Overall, the formation of organized solids takes hours vs weeks in contrast to the slow and heterogeneous process of drying from the traditional dish-cast approach. The saturation of water vapor in one end of the capillary causes anisotropic drying and promotes unidirectional propagation of the anisotropic phase in large regions that results in chiral CNC solid films with a uniformly oriented layered morphology. Corresponding ordering processes were monitored in situ at a nanoscale, mesoscale, and microscopic scale with complementary scattering and microscopic techniques. The resulting films show high orientation order at a multilength scale over large regions and preserved chiral handedness causing a narrower optical reflectance band and uniform birefringence over macroscopic regions in contrast to traditional dish-cast CNC films and those assembled in a magnetic field and on porous substrates. These thin films with a controllable and well-identified uniform morphology, structural colors, and handedness open up interesting possibilities for broad applications in bioderived photonic nanomaterials.
引用
收藏
页码:6770 / 6777
页数:8
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