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Crystals 2017, 7(10), 287; doi:10.3390/cryst7100287

Electro-optical Effect of Gold Nanoparticle Dispersed in Nematic Liquid Crystals

1
Graduate Institute of Photonics, National Changhua University of Education, Changhua 500, Taiwan
2
Department of Physics, National Changhua University of Education, Changhua 500, Taiwan
*
Author to whom correspondence should be addressed.
Received: 13 July 2017 / Revised: 21 September 2017 / Accepted: 22 September 2017 / Published: 23 September 2017
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Abstract

The electro-optical performance of nematic liquid crystals (NLCs) dispersed with gold nanoparticles (GNPs) was investigated in this study. The addition of a small amount of GNP dopant decreased the threshold voltage for LC reorientation due to the decreased elastic constant and increased dielectric anisotropy of the LC mixture. The response time of the LC cell was decreased with the addition of tiny amounts of GNPs because of decrease in rotational viscosity of LCs. The doped GNPs also shorten LC reorientation angle during voltage switching, further decreasing the response time of the LC cell. The addition of high amounts of GNPs slowed down the response time of the LC cell, because excess GNPs aggregated and formed networks in the cell, thus disturbing LC alignment and hindering LC reorientation. The measured dielectric spectra of the GNP-LC mixture revealed that the addition of GNPs decreased the relaxation time constant of the LCs. This result confirmed that the GNP dopant decreased the rotational viscosity and elastic constant of the LCs. View Full-Text
Keywords: gold nanoparticle; liquid crystal; elastic constant; viscosity; relaxation frequency gold nanoparticle; liquid crystal; elastic constant; viscosity; relaxation frequency
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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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Hsu, C.-J.; Lin, L.-J.; Huang, M.-K.; Huang, C.-Y. Electro-optical Effect of Gold Nanoparticle Dispersed in Nematic Liquid Crystals. Crystals 2017, 7, 287.

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