Dielectric and Electro-Optical Properties of Ceramic Nanoparticles Doped Liquid Crystals

Porov, Preeti; Chandel, Vishal Singh; Manohar, Rajiv

doi:10.4313/teem.2016.17.2.69

Cited by 12 publications

(3 citation statements)

References 67 publications

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“…The change in the CR for the NP-dispersed sample can be attributed to molecular alignment ability of NPs, which alters the alignment of LC molecules and improve the optical properties of LCs [43]. Variation of the CR with temperature for E7 and E7-ZnO samples is shown in figure 7 and a decrease in the CR was observed with an increase in temperature from the nematic to isotropic phase, which is due to fact that an increase in temperature increases disorder of LC molecules and affects the CR [44].…”

Section: Pom Studymentioning

confidence: 94%

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Improvement in electro-optical and dielectric characteristics of ZnO nanoparticles dispersed in a nematic liquid crystal mixture

et al. 2019

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Reported herein is the effect of dispersion of a fixed amount of 0.5% (wt/wt) ZnO nanoparticles (NPs) in a nematic (E7) liquid crystal (LC) mixture. Dispersion of ZnO NPs results in a significant improvement in electro-optical and dielectric parameters of the nematic mixture. Comparative analysis of undoped and NP-dispersed samples shows a reduced threshold voltage with better transmittance without compromising dielectric permittivity characteristics. In addition, an increase in the contrast ratio, birefringence, alternating-current conductivity and band gap was observed after dispersion of ZnO NPs in LCs. A polarized optical microscopic study of the NP-dispersed sample substantiates a slight increase in nematic-isotropic phase transition temperature of LCs.

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Section: Pom Studymentioning

confidence: 94%

“…The cell was further examined through the POM to make it completely trace free of benzene. The dielectric relaxation spectrum can be described with the help of the generalized Cole-Cole equation and is given by [14,35,[43][44][45][46][47]:…”

Section: Dielectric Measurementsmentioning

confidence: 99%

Improvement in electro-optical and dielectric characteristics of ZnO nanoparticles dispersed in a nematic liquid crystal mixture

et al. 2019

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“…Numerous researchers have reported that the addition of NPs changes the values of the dielectric permittivity and dielectric anisotropy of LCs. The presence of zinc ferrite (ZnFe 2 O 4 ) has a significant impact on the dielectric and electro-optical properties of the host 7CB nematic liquid crystal [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Formation of nano and micro scale hierarchical structures in MgO and ZnO quantum dots doped LC media: the role of competitive forces

Singh,

Singh

2023

Condens. Matter Phys.

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In this paper, we have studied the effect of doping of ZnO and MgO nanoparticles (NPs) in 4-(trans-4-n-hexylcyclo-hexyl) isothiocyanatobenzoate. A thorough comparison of dielectric properties, optoelectronic properties, and calorimetric phase transition properties has been done for MgO and ZnO NP doped LC. We prepare their homogenous mixture of MgO and ZnO NPs in toluene and transfer into cells made of glass and Indium Tin-Oxide (ITO) coated glass. The observed microstructures in the hybrid system can be classified into three main categories: grain like structures formed by aggregation of smaller size MgO nanoparticles while liquid crystal molecules anchor over the surfaces of nanoparticles, the grtu grain-like structures further integrate to form inorganic polymeric type of honeycomb-like mesostructures in presence of glass surface, and flower-like clusters of MgO nanoparticles on ITO surface. The smaller size nanoparticles can maintain the energy balance by allowing the anchoring of liquid crystal molecules over their surfaces whereas the larger size nanoparticles cannot compromise or maintain the energy balance with the liquid crystal molecules and are separated out to nucleate and form bigger size nanoaggregate or clusters. The energy preference of the substrate and nanoparticle’s surface to liquid crystal molecules plays an important role in the formation of different types of hierarchical nano- and microstructures. We account the reasons for the formation of nano and micro scale hierarchical structures on the basis of the competition between the forces: NP-NP, LC-LC, NP-LC, Glass/ITO-NP, and Glass/ITO-LC interactions. We observed a considerable change in the dielectric properties, transition temperature, bandgap, and other parameters of LC molecules when MgO NPs are doped, but a minor change occurs when ZnO NPs are doped in LC. Optical microscopy, FTIR, Raman, IR, HR-XRD and FESEM-EDX characterization data confirm and validate our guiding conceptions.

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Synthesis, characterization, and dielectric spectroscopy of TiO2 and ZnO nanoparticle-reinforced epoxy composites

Watpade,

Thakor,

Sharma

et al. 2024

J Mater Sci: Mater Electron

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Dielectric and Electro-Optical Properties of Ceramic Nanoparticles Doped Liquid Crystals

Cited by 12 publications

References 67 publications

Improvement in electro-optical and dielectric characteristics of ZnO nanoparticles dispersed in a nematic liquid crystal mixture

Improvement in electro-optical and dielectric characteristics of ZnO nanoparticles dispersed in a nematic liquid crystal mixture

Formation of nano and micro scale hierarchical structures in MgO and ZnO quantum dots doped LC media: the role of competitive forces

Synthesis, characterization, and dielectric spectroscopy of TiO2 and ZnO nanoparticle-reinforced epoxy composites

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