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Crystals 2015, 5(3), 302-311; doi:10.3390/cryst5030302

Pitch-Length Independent Threshold Voltage of Polymer/Cholesteric Liquid Crystal Nano-Composites

Department of Electrical, Electronic and Information Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan
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Author to whom correspondence should be addressed.
Academic Editor: Oleg D. Lavrentovich
Received: 3 July 2015 / Revised: 7 August 2015 / Accepted: 13 August 2015 / Published: 19 August 2015
(This article belongs to the Special Issue Liquid Crystal Films)
View Full-Text   |   Download PDF [3721 KB, uploaded 19 August 2015]   |  

Abstract

Polymer/cholesteric liquid crystal (ChLC) nano-composites consisting of mesogenic monomers and LCs have nano-sized LC domains dispersed in an anisotropic polymer matrix. They exhibit characteristics not observed in conventional ChLCs, such as sub-millisecond and “deformation-free” electro-optic tuning of the selective reflection band; however, their driving voltage is high compared to conventional ChLCs, and is an issue that needs to be solved for the practical use. Here, we investigate the helical pitch dependence of threshold voltage in polymer/ChLC nano-composites. Five samples with different helical pitches were prepared and their electro-optic characteristics were compared before and after photopolymerization. Although the threshold voltage of the unpolymerized samples were inversely proportional to its helical pitch, the threshold voltage of the polymerized samples showed no dependence on the helical pitch. These results are explained to be a consequence of the driving mechanism of the polymer/ChLC nano-composite, in which electro-optic switching is achieved as a consequence of the nano-confined LC molecules reorienting along the electric field, instead of the helical structure becoming unwound. The threshold voltage is independent of pitch length because the pore sizes are similar in all samples. View Full-Text
Keywords: cholesteric liquid crystal; polymer/cholesteric liquid crystal nano-composite;polymer networks; helical pitch; threshold cholesteric liquid crystal; polymer/cholesteric liquid crystal nano-composite;polymer networks; helical pitch; threshold
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Kim, H.; Kobashi, J.; Maeda, Y.; Yoshida, H.; Ozaki, M. Pitch-Length Independent Threshold Voltage of Polymer/Cholesteric Liquid Crystal Nano-Composites. Crystals 2015, 5, 302-311.

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