Chiroptical properties of cholesteric liquid crystals of chitosan phenylcarbamate in ionic liquids

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Chiroptical Properties of Cholesteric Liquid Crystals of Chitosan Phenylcarbamate in Ionic Liquids

Chitosan phenylcarbamate (CtsPC) samples were synthesized to have different degrees of substitution (DS) ranging from 2.3 to 3.5, and their lyotropic liquid crystallinity in ionic liquids was investigated. 1-Ethyl-3-methylimidazolium dicyanamide ([C2Mim][N(CN)2]) was found to be a novel solvent for CtsPC, and the concentrated lyotropic system formed a cholesteric liquid-crystalline phase and mo...

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Wetting of cholesteric liquid crystals.

We investigate theoretically the wetting properties of cholesteric liquid crystals at a planar substrate. If the properties of substrate and of the interface are such that the cholesteric layers are not distorted, the wetting properties are similar to those of a nematic liquid crystal. If, on the other hand, the anchoring conditions force the distortion of the liquid crystal layers the wetting ...

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Evolution of disclinations in cholesteric liquid crystals.

We studied the evolution of defect lines (oily streaks) in cholesteric liquid crystals. In contrast to nematic liquid crystals, there were no interactions between the defect lines in cholesteric liquid crystals. We observed experimentally that individual open defect segments shrank with time with a linear relation, and individual defect loops shrank with time with a square root relation. We als...

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Magnetic and Electric Properties of Organic Nitroxide Radical Liquid Crystals and Ionic Liquids

© 2012 Tamura et al., licensee InTech. This is an open access chapter distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Magnetic and Electric Properties of Organic Nitroxide Radical Liquid Crystals and Ion...

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Cholesteric Liquid Crystals: Flow Properties, Thermo- and Electromechanical Coupling

From an experimental point of view the outstanding development in the area of Lehmann-type effects is clearly the demonstration of the transmembrane transfer of water molecules across chiral liquid crystalline monolayers located at an air-liquid interface by Tabe and Yokoyama (2003). Tabe and Yokoyama observed the formation of patterns such target waves due to the phase winding of the director ...

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ژورنال

عنوان ژورنال: Polymer Journal

سال: 2014

ISSN: 0032-3896,1349-0540

DOI: 10.1038/pj.2014.34