Dielectric Properties of Frequency Modulation Twisted Nematic LCDs Doped with Palladium (Pd) Nanoparticles

Shiraki, Hiroyuki; Kundu, Sudarshan; Sakai, Yoshio; Masumi, Takenori; Shiraishi, Yukihide; Toshima, Naoki; Kobayashi, Shunsuke

doi:10.1143/jjap.43.5425

Cited by 34 publications

(18 citation statements)

References 5 publications

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“…Liquid crystal displays (LCDs) doped with metal NPs such as silver (Ag), gold (Au), palladium (Pd), platinum (Pt), or their alloys exhibited faster response times [8][9][10][11][12] than those of LCDs with conventional driving methods.…”

Section: Introductionmentioning

confidence: 99%

Effect of ZnO nanoparticles on the SmC-SmA phase transition temperature in electroclinic liquid crystals

Malik

Choudhary

Silotia

et al. 2011

Journal of Applied Physics

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Experimental assessment of quasi-binary picture of thermotropics: Induced smectic A phase in 7CB-n-heptane system J. Chem. Phys. 135, 044705 (2011) Does transparent nematic phase exist in 5CB/DDAB/water microemulsions? From the viewpoint of temperature dependent dielectric spectroscopy J. Chem. Phys. 134, 034505 (2011) A kind of two-dimensional electroconvection at ultralow electric frequency Appl. Phys. Lett. 97, 203507 (2010) Study of the isotropic to smectic-A phase transition in liquid crystal and acetone binary mixtures J. Chem. Phys. 133, 174501 (2010) Thermotropic nematic and smectic order in silica glass nanochannels Appl. Phys. Lett. 97, 153124 (2010) Additional information on J. Appl. Phys. ZnO nanoparticles (NPs), synthesized in an alcoholic medium at room temperature, were added to electroclinic liquid crystal (ELC) materials. The addition of ZnO NPs in ELCs, caused a remarkable shift in SmC * -SmA * phase transition which was investigated from the dielectric and electro-optical measurements. The anchoring of ELC molecules around ZnO NPs creates orientational distortions near the surface, which may give additional ordering to the ELC molecular arrangement. After analyzing collective dielectric relaxation processes of ZnO NP doped ELCs, three distinct loss peaks were observed. The different behavior of ZnO NP doped ELC from pure ELC has been explained by determining the dielectric strength, the distribution parameter and the corresponding relaxation frequency, and so on, and then these results have been compared with the data calculated by using the theoretical model. The effect of ZnO NPs addition on physical parameters, such as spontaneous polarization (P s ) and rotational viscosity (g) has also been observed.

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Section: Introductionmentioning

confidence: 99%

Effect of ZnO nanoparticles on the SmC-SmA phase transition temperature in electroclinic liquid crystals

Malik

Choudhary

Silotia

et al. 2011

Journal of Applied Physics

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“…The purpose of this work was to research the possibilities for manifestation of the structural ordering of С60D molecules in NLC and to define what methods serving as a basis of the changes in NLC properties can be investigated most efficiently [5,6].…”

Section: Semiconductor Physics Quantum Electronics and Optoelectronicsmentioning

confidence: 99%

Dielectric and electro-optical properties of solutions of chemically modified fullerene С60 in nematic liquid crystal

Vovk¹,

Lashkaryov²

2011

Semicond. Phys. Quantum Electron. Optoelectron.

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Abstract. Solutions of fullerene molecules С60 with chemically attached molecules of diamine (С60D) in planar oriented nematic liquid crystal (NLC) were obtained by only heating and ultrasonic processing. The С60D concentration changes from 0 up to 3.0 wt.%. Within the ranges of frequencies 10 -1 -10 6 Hz and temperatures 298-343 K, dielectric properties of solutions were investigated. It was shown that, at frequencies higher than 100 Hz, the frequency dispersion of the components of complex dielectric permittivity is absent. A value of conductivity of the solution was determined. It was also shown that the activation energy for the temperature dependence of the conductivity in nematic and isotropic phases does not depend on the concentration of molecules С60D. Obtained and explained were the reasons of the nonmonotonic conductivity dependence of solutions on the concentration of С60D molecules. For frequencies lower than 100 Hz, the dispersion of the components of complex dielectric permittivity is observed. It was shown that the dispersion can be described by the Debye equation. The temperature dependence of a value inverse to the relaxation time correlates with the temperature dependence of conductivity. Presence of С60D molecules in NLC tends to increasing the voltage for the Frederiksz transition. Made was the assumption that this effect may be explained by increase in viscosity of NLC as a consequence of aggregation of fullerene molecules.

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“…The modification of physical properties of liquid crystals by doping nanomaterials has received much attention from the view point of the enhancement of the performance of LCDs. Reflecting these trends several research groups reported on heterogeneous liquid crystal suspensions using; ferroelectric nanoparticles [1], ferromagnetic particles [2], fullerene [3], carbon nanotubes [4], diamond powders [5], metal nanoparticles [6,7], and metal nanorods [8]. In particular, strong activities have been reported for barium titanate (BaTiO 3 ) nanoparticles doped in nematic liquid crystalline mixtures [9].…”

Section: Introductionmentioning

confidence: 99%

Effect of Particle Size on Electro-Optic Properties of Liquid Crystal Devices Doped with γ-Cyclodextrin Stabilized Barium Titanate Nanoparticles

Shiraishi

Tsujihata

Sawai

et al. 2015

Molecular Crystals and Liquid Crystals

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Barium titanate stabilized by γ -cyclodextrin nanoparticles were prepared by using a microwave reactor equipped with ultrasonic nozzle mixing at 240 • C in a tetraethylene glycol solution of barium ethoxide and titanium ethoxide in the presence of γ -cyclodextrin. Particles in γ -cyclodextrin-stabilized BaTiO 3 nanoparticles had an average diameter of 2.1 nm and mainly distributed within the range of about 1 to 4 nm. The γ -cyclodextrinstabilized BaTiO 3 nanoparticles were mixed with 4-cyano-4 -pentylbiphenyl at room temperature resulting in a liquid crystal sol of 4-cyano-4 -pentylbiphenyl. The response time of liquid crystal devices in the presence of γ -cyclodextrin-stabilized BaTiO 3 nanoparticles was faster than that in the absence.

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Dielectric Properties of Frequency Modulation Twisted Nematic LCDs Doped with Palladium (Pd) Nanoparticles

Cited by 34 publications

References 5 publications

Effect of ZnO nanoparticles on the SmC-SmA phase transition temperature in electroclinic liquid crystals

Effect of ZnO nanoparticles on the SmC-SmA phase transition temperature in electroclinic liquid crystals

Dielectric and electro-optical properties of solutions of chemically modified fullerene С60 in nematic liquid crystal

Effect of Particle Size on Electro-Optic Properties of Liquid Crystal Devices Doped with γ-Cyclodextrin Stabilized Barium Titanate Nanoparticles

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Dielectric Properties of Frequency Modulation Twisted Nematic LCDs Doped with Palladium (Pd) Nanoparticles

Cited by 34 publications

References 5 publications

Effect of ZnO nanoparticles on the SmC*-SmA* phase transition temperature in electroclinic liquid crystals

Effect of ZnO nanoparticles on the SmC*-SmA* phase transition temperature in electroclinic liquid crystals

Dielectric and electro-optical properties of solutions of chemically modified fullerene С60 in nematic liquid crystal

Effect of Particle Size on Electro-Optic Properties of Liquid Crystal Devices Doped with γ-Cyclodextrin Stabilized Barium Titanate Nanoparticles

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Effect of ZnO nanoparticles on the SmC-SmA phase transition temperature in electroclinic liquid crystals

Effect of ZnO nanoparticles on the SmC-SmA phase transition temperature in electroclinic liquid crystals