Frequency Modulation Response of a Tunable Birefringent Mode Nematic Liquid Crystal Electrooptic Device Fabricated by Doping Nanoparticles of Pd Covered with Liquid-Crystal Molecules

Yoshikawa, Hiroaki; Maeda, Kenji; Shiraishi, Yukihide; Xu, Jian; Shiraki, Hiroyuki; Toshima, Naoki; Kobayashi, Shunsuke

doi:10.1143/jjap.41.l1315

Cited by 52 publications

(29 citation statements)

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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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“…[6][7][8][9][10] The striking ability of nematic LCs to induce 1D and 2D order in dispersed particles on the colloidal scale has been the subject of numerous experimental and theoretical studies. [11,12] Chains, braids, and rafts of micrometer-sized colloidal spheres were assembled using laser tweezers and held together by dipolar and quadrupolar defects in the director field.…”

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confidence: 99%

3D Ordered Gold Strings by Coating Nanoparticles with Mesogens

et al. 2009

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The first 3D metamaterial with a negative refractive index in the near infrared has been announced recently.[1] Like previous examples of negative refraction at microwave frequencies, [2,3] the material was fabricated by a top-down technique using focused-ion-beam etching, in this case. There would be considerable advantages in being able to generate bulk 3D arrays of ''meta-atoms'', that is, metal nanoparticles, with prescribed geometrical layouts using a self-assembly approach. As recently theoretically shown, [4] devices with interesting optical properties, such as band-pass filters, could be generated from well-ordered 3D arrays of nanoparticles much smaller than the wavelength of light and spaced at a controlled distance from each other. Such systems would benefit from a Lorentz-type resonance in the permittivity at the collective plasmon frequency. Ordered clusters of such lattices, also producing resonances in permeability, could then lead to negative refractive indexes in a wide spectral range, including the visible-light range.[5] Here, we report on ordered bulk arrays of gold nanoparticles whose spatial arrangement is governed by their coating with a laterally attached nematic liquid-crystal-forming ligand. Grazing-incidence small-angle diffraction (GISAXS) of aligned thin films reveals highly ordered rhombohedral and two-columnar (hexagonal and rectangular) structures, with the gap between nanoparticles adjustable between 16 and 4 Å . Furthermore, the presence of the incorporated nanoparticles helps to provide evidence of longrange biaxial order in the surrounding nematic in one of the phases observed.Interest in adding colloids and nanoparticles to liquid crystals (LCs) has been largely based on their ability to significantly alter the dielectric behavior of LCs, which could potentially result in faster switching devices. [6][7][8][9][10] The striking ability of nematic LCs to induce 1D and 2D order in dispersed particles on the colloidal scale has been the subject of numerous experimental and theoretical studies. [11,12] Chains, braids, and rafts of micrometer-sized colloidal spheres were assembled using laser tweezers and held together by dipolar and quadrupolar defects in the director field. [13] Assembling metallic nanoparticles is of great interest for electronic, [14] optical, [15] and photonic [16] applications. Metal nanoparticles derivatized with alkane thiols, acids, or amines could only be made to form bulk lattices with long-range order if they were highly monodisperse. [17,18] The lattices were those expected from packing of spheres, that is, body-centered cubic (bcc), hexagonal close-packed, or face-centered cubic (fcc). Derivatization of gold nanoparticles with bulkier monodendron thiols, [19] as well as with DNA sequences, [20,21] also produced bcc or fcc lattices. Using a bimodal particle-size distribution, interesting planar structures have been achieved on surfaces. [22] Self-assembly of nanoparticles of two different materials has yielded a considerable diversity of binary nanopart...

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“…To obtain a higher display quality, the effects of fine particles added in LCs on the characteristics of the LCs have been investigated by several groups [1][2][3][4][5]. The chosen materials range from conducting materials [1,2] to insulating carbon nanotubes (CNTs) [3,4] and ferroelectric particles [5].…”

Section: Introductionmentioning

confidence: 99%

“…So far the subjects have included various kinds of materials such as metallic Ag-or Pd-nanoparticles [1,2], CNTs [3,4,[11][12][13], diamond particles [14], semiconductive nanotubes [15], cage-like polymeric molecules such as polyhedral oligomeric silsesquioxanes (POSS) [16,17], and ferroelectric particles [5,18]. By using these nanoparticle candidates, newly found texture, switching behavior, or enhanced electro-optical response for the modified LC can be achieved.…”

Section: Introductionmentioning

confidence: 99%

Effects of Nanoscaled Tin-Doped Indium Oxide on Liquid Crystals against Electrostatic Discharge

et al. 2013

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In our studies, it was confirmed that the cause of image sticking on liquid crystal (LC) cells is based on attacks of electrostatic discharge (ESD), which can be greatly relieved by doping with a small amount of tin-doped indium oxide (ITO) nanoparticles. Our proposed remedy allows the residual time of image sticking to be significantly reduced by more than an order and may protect the LC displays against any adverse ESD conditions, thus enhancing the overall display quality and reliability. In this study, conventional voltage-transmittance (V-T) characterization, voltage holding ratio (VHR) measurement, and ESD testing were employed to investigate the properties of the ITO-doped LCs. Based on our low voltage measurement results, it is interesting to find that ITO nanoparticles do not evidently alter the intrinsic properties of the LC. Namely, ITO additive initiates an early breakdown of the doped LC samples exposed to high electric fields. A model is proposed in this paper to depict the possible role of ITO particles applied in LCs. OPEN ACCESSCrystals 2013, 3 531

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Frequency Modulation Response of a Tunable Birefringent Mode Nematic Liquid Crystal Electrooptic Device Fabricated by Doping Nanoparticles of Pd Covered with Liquid-Crystal Molecules

Cited by 52 publications

References 1 publication

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

3D Ordered Gold Strings by Coating Nanoparticles with Mesogens

Effects of Nanoscaled Tin-Doped Indium Oxide on Liquid Crystals against Electrostatic Discharge

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Frequency Modulation Response of a Tunable Birefringent Mode Nematic Liquid Crystal Electrooptic Device Fabricated by Doping Nanoparticles of Pd Covered with Liquid-Crystal Molecules

Cited by 52 publications

References 1 publication

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

3D Ordered Gold Strings by Coating Nanoparticles with Mesogens

Effects of Nanoscaled Tin-Doped Indium Oxide on Liquid Crystals against Electrostatic Discharge

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Product

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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