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Switchable Response of Ferroelectric Nanoparticle Doped Polymer-Dispersed Liquid Crystals

Title
Switchable Response of Ferroelectric Nanoparticle Doped Polymer-Dispersed Liquid Crystals
Authors
Shim, H[Shim, Hyunseok]Lyu, HK[Lyu, Hong-Kun]Allabergenov, B[Allabergenov, Bunyod]Garbovskiy, Y[Garbovskiy, Yuriy]Glushchenko, A[Glushchenko, Anatoliy]Choi, B[Choi, Byeongdae]
DGIST Authors
Shim, H[Shim, Hyunseok]; Lyu, HK[Lyu, Hong-Kun]Choi, B[Choi, Byeongdae]
Issue Date
2016-10
Citation
Journal of Nanoscience and Nanotechnology, 16(10), 11125-11129
Type
Article
Article Type
Article
Keywords
Barium CompoundsBlendingBTO NanoparticlesDoped PolymersDoping (Additives)Driving VoltagesElectrical PerformanceElectro-Optical PropertiesFerroelectricityLiquid Crystal-PolymersLiquid Crystal DisplaysLiquid CrystalsLiquid Crystals (LCs)LiquidsNano ParticleNanoparticlesOptical PropertiesParticle SizePhase SeparationPolymer-Dispersed Liquid Crystal (PDLC)Polymer Dispersed Liquid Crystals (PDLC)Polymerization Induced Phase SeparationsResponse-Time (Computer Systems)Response TimeSemiconductor DopingSuspensions (Fluids)
ISSN
1533-4880
Abstract
In this study, we doped polymer-dispersed liquid crystals (PDLCs) with barium titanate (BaTiO3, BTO) nanoparticles to investigate the effects of particle size on the electro-optical properties of the suspensions, such as the driving voltage and response time. We mixed BTO nanoparticles having various sizes of 8 nm, 20 nm, and 2 μm, and liquid crystals (LCs) (E7) prior to blending the LCs and pre-polymers (NOA 65). We fabricated the PDLC films using the polymerization-induced phase-separation (PIPS) method. The film surface was irradiated with UV (365 nm) light for 3 min to induce phase separation between the LC and the polymer. According to the results, the 10% transmittance voltage (V10) improved from 18.2 V to 6.8 V by the addition of 0.3 vol% of 8 nm BTO particles to the PDLC. The response time also decreased from 15.2 ms to 8.4 ms. Smaller particles were distributed more uniformly within the sample, which resulted in a reduction of the V10 and response time of the PDLCs. The results obtained imply that nanoscale ferroelectric particle doping is a powerful tool to tune electro-optical properties of liquid crystals based systems, including improving the electrical performances without compromising other important characteristics, such as the haze of the PDLC devices. Copyright © 2016 American Scientific Publishers All rights reserved.
URI
http://hdl.handle.net/20.500.11750/2175
DOI
10.1166/jnn.2016.13302
Publisher
American Scientific Publishers
Related Researcher
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Collection:
Division of IoT∙Robotics Convergence Research1. Journal Articles


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