Enhanced electro-optical properties of a nematic liquid crystals in presence of BaTiO<sub>3</sub>nanoparticles

Singh, U. B.; Dhar, Ravindra; Dąbrowski, R.; Pandey, M. B.

doi:10.1080/02678292.2014.894209

Cited by 61 publications

(20 citation statements)

References 31 publications

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“…2019, 9, 2512 5 of 47 Up to now, there have been four primary groups of nanomaterials used as dopants in LCs, i.e., metal nanoparticles, ferroelectric nanoparticles, semi-conductor nanoparticles, and carbon nanoparticles. Among these dispersions, improved physical characteristics and novel functionalities can be obtained depending on the physical and chemical characteristics of the dopants as well as the interaction between LCs and nanomaterials [90][91][92][93][94][95]. For example, there are abundant reports declaring that doping metallic, semiconducting, oxide and ferroelectric nanoparticles into LCs can efficiently modify the electrical and mechanical (viscoelastic) properties of LC host, leading to large dielectric and optical anisotropy, low threshold voltage, and an improved electro-optical response [87,92,94,96,97].…”

Section: Introductionmentioning

confidence: 99%

Perspectives in Liquid-Crystal-Aided Nanotechnology and Nanoscience

2019

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The research field of liquid crystals and their applications is recently changing from being largely focused on display applications and optical shutter elements in various fields, to quite novel and diverse applications in the area of nanotechnology and nanoscience. Functional nanoparticles have recently been used to a significant extent to modify the physical properties of liquid crystals by the addition of ferroelectric and magnetic particles of different shapes, such as arbitrary and spherical, rods, wires and discs. Also, particles influencing optical properties are increasingly popular, such as quantum dots, plasmonic, semiconductors and metamaterials. The self-organization of liquid crystals is exploited to order templates and orient nanoparticles. Similarly, nanoparticles such as rods, nanotubes and graphene oxide are shown to form lyotropic liquid crystal phases in the presence of isotropic host solvents. These effects lead to a wealth of novel applications, many of which will be reviewed in this publication. the observation of chirality from achiral molecules, resulting from sterically induced packing of the bent-core mesogens [10], such as ferroelectricity or the formation of helical superstructures in the B7 phase [14]. Thermotropic LCs are commonly constituted by single organic entities or mixtures thereof, which exhibit various mesophases at different temperatures or pressures [15], illustrated in Figure 1b. As the temperature rises, a typical thermotropic LC passes through higher ordered phases, also called soft crystals, the hexatic smectic phases with positional order as well as bond orientational order, through the fluid smectic phases (SmC and SmA), which exhibit both positional and orientational order, and finally to the nematic phase (N) with purely orientational order, into the isotropic phase. The number of different phases observed depends on the chemical composition, symmetry and order of the LC molecules. About 25 different thermotropic phases are known to date, and they are still increasing in number. Appl. Sci. 2019, 9, x FOR PEER REVIEW 2 of 47 unique effects of the observation of chirality from achiral molecules, resulting from sterically induced packing of the bent-core mesogens [10], such as ferroelectricity or the formation of helical superstructures in the B7 phase [14]. Thermotropic LCs are commonly constituted by single organic entities or mixtures thereof, which exhibit various mesophases at different temperatures or pressures [15], illustrated in Figure 1b. As the temperature rises, a typical thermotropic LC passes through higher ordered phases, also called soft crystals, the hexatic smectic phases with positional order as well as bond orientational order, through the fluid smectic phases (SmC and SmA), which exhibit both positional and orientational order, and finally to the nematic phase (N) with purely orientational order, into the isotropic phase. The number of different phases observed depends on the chemical composition, symmetry and order of the LC molecules. About...

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Section: Introductionmentioning

confidence: 99%

Perspectives in Liquid-Crystal-Aided Nanotechnology and Nanoscience

2019

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“…Typically, nematic LCs are mostly used as a carrier for such composites. [1][2][3][4][5]30] The number of publication devoted to study the ferroelectric liquid crystals (FLC) as the host media have been increasing for the moment. [12,14,17,[21][22][23][24][25]27,28,[31][32][33] Unfortunately, not all of the works cited above contain reliable evidence for the absence of aggregation in such composites (observation of the bulk by the naked eye is not considered as evidence).…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5] Such materials combine technological potential of LC with unique properties of NPs. Thus, NPs dispersed in LCs can improve magnetic, [6][7][8][9][10][11][12][13][14][15][16][17] electrooptic and dielectric [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] properties to the resultant material. Typically, nematic LCs are mostly used as a carrier for such composites.…”

Section: Introductionmentioning

confidence: 99%

Dielectric properties of magnetic nanoparticles’ suspension in a ferroelectric liquid crystal

et al. 2015

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Colloids of elongated γ-Fe 2 O 3 magnetic nanoparticles (NPs) in a ferroelectric liquid crystal (FLC) were studied. Decreasing the dielectric strength of the Goldstone mode and changing the value of Cole-Cole parameter were found in the suspensions. It was also shown that the effect of introducing magnetic particles into a FLC consists of increasing the electric field strength magnitude required for unwinding its helical structure. Effect of magnetic field on dielectric properties of the FLC colloid was also studied. Dielectric constant measured under static magnetic field is different for the FLC host and FLC doped with the NPs.

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“…Singh et al prepared composites of nematic LCs and ferroelectric barium titanate (BaTiO 3 ) nanoparticles (NPs) and the alignments of NPs in the host medium had been demonstrated [49]. Effect of NPs doping on various display parameters of nematic LCs, namely, threshold voltage, dielectric anisotropy and splay elastic constant had been studied using electro-optical and dielectric studies.…”

Section: Properties Of Doped Nematic Liquid Crystalsmentioning

confidence: 99%

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

Porov¹,

Chandel²,

Manohar³

2016

Transactions on Electrical and Electronic Materials

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Liquid crystals are important materials because of their applications in display technology and many other scientific applications. Different mixtures of liquid crystals and their doped samples have gained interest because a single liquid crystal compound cannot fulfill all the required parameters for the display application. The doping can be accomplished with dyes, polymers, or composite nanoparticles among other substance. The addition of nanoparticles can modify the physical properties of the host liquid crystal and enhances the performance of electro-optical devices. The present study is focused on investigations of possible changes in dielectric and electro optical properties of liquid crystals caused by doping with ceramic nanoparticles. Including smaller nanoparticles were found to be better candidates for use in suppressing the unwanted ion effects in liquid crystal displays.

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Enhanced electro-optical properties of a nematic liquid crystals in presence of BaTiO₃nanoparticles

Cited by 61 publications

References 31 publications

Perspectives in Liquid-Crystal-Aided Nanotechnology and Nanoscience

Perspectives in Liquid-Crystal-Aided Nanotechnology and Nanoscience

Dielectric properties of magnetic nanoparticles’ suspension in a ferroelectric liquid crystal

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

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Enhanced electro-optical properties of a nematic liquid crystals in presence of BaTiO3nanoparticles

Cited by 61 publications

References 31 publications

Perspectives in Liquid-Crystal-Aided Nanotechnology and Nanoscience

Perspectives in Liquid-Crystal-Aided Nanotechnology and Nanoscience

Dielectric properties of magnetic nanoparticles’ suspension in a ferroelectric liquid crystal

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

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Enhanced electro-optical properties of a nematic liquid crystals in presence of BaTiO₃nanoparticles