Thermodynamical, optical, electrical and electro-optical studies of a room temperature nematic liquid crystal 4-pentyl-4′-cyanobiphenyl dispersed with barium titanate nanoparticles

Mishra, Mukesh; Dąbrowski, R.; Dhar, Ravindra

doi:10.1016/j.molliq.2015.11.007

Cited by 70 publications

(16 citation statements)

References 40 publications

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“…The ferroelectric nanoparticle-LC composite in their system showed an improved electro-optical characteristic, accompanied by an increase in the dielectric anisotropy as well as a decrease in the threshold voltage. Mishra et al found that the physical properties of suspensions of ferroelectric nanoparticles of barium titanate dispersed in the nematic liquid crystal 5CB are largely dependent on the concentration of nanoparticles [171]. For samples with a low concentration (<1 wt %), the threshold voltage, elastic constants, dielectric coefficients and ionic conductivity could be effectively changed.…”

Section: Modification Of Physical Properties Of Lc Materials By Nanodmentioning

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: Modification Of Physical Properties Of Lc Materials By Nanodmentioning

confidence: 99%

Perspectives in Liquid-Crystal-Aided Nanotechnology and Nanoscience

2019

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“…Nematic LC 4-cyano-4 -pentylbiphenyl (5CB) is well studied mesogen. The effects of dispersion of TiO 2 NPs [3,4], CuS NPs [8], GNPs (gold) [46,47], and BaTiO 3 NPs [48] on the ionic behavior and screening effect, alignment and electro-optical properties, photoluminescence, and thermodynamic, optical and electrical properties have been studied extensively. In these works, different issues have been addressed.…”

Section: Dispersion Of Nanoparticles In Nematicsmentioning

confidence: 99%

“…This was attributed to the fact that smaller NPs have larger surface area, which causes multiple reflection and scattering of the excitons. Mishra et al [48] dispersed ferroelectric BaTiO 3 NPs in nematic 5CB and studied the properties of pure nematic and dispersed systems using DSC, UV-Vis spectroscopy, polarized light microscopy, dielectric spectroscopy, and electro-optical techniques. It was observed that the effects of BaTiO 3 NPs dispersion in nematic host on the thermodynamic, optical, electrical, and electro-optical properties are highly dependent on the concentration of NPs in host matrix.…”

Section: Dispersion Of Nanoparticles In Nematicsmentioning

confidence: 99%

Impact of Dispersion of Nanoscale Particles on the Properties of Nematic Liquid Crystals

Singh

2019

Crystals

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This work reviews the recent progress made in last decade in understanding the role of dispersion ofnanoparticles and quantum dots into host nematic liquid crystals. There are two important ingredients of this work: Even a minute concentration of these non-mesogenic materials in host matrix can have reflective impact on the dielectric, electro-optical, and spectroscopic properties of host nematics and the nematic-nanoparticles composite systems become suitable for the use in nematic based display and other devices.

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“…Research into the properties of liquid crystals doped with ferroelectric nanoparticles, initially undertaken by European and American scientists mostly, received a considerable boost due to the contributions coming from China, India, Iran, Taiwan, South Korea, and Japan. Several papers published in 2010–2011 [ 53 , 55 , 61 , 66 ] were followed up by an even greater number of publications [ 67 , 70 , 78 , 79 , 81 , 88 , 97 , 100 , 102 , 104 , 107 , 110 , 111 , 116 , 117 , 119 ]. For example, low voltage and hysteresis free blue phase liquid crystals doped with ferroelectric nanoparticles were reported [ 67 , 97 ].…”

Section: Liquid Crystals Doped With Ferroelectric Nanoparticles: Amentioning

confidence: 99%

Ferroelectric Nanoparticles in Liquid Crystals: Recent Progress and Current Challenges

Garbovskiy

Glushchenko

2017

Nanomaterials

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The dispersion of ferroelectric nanomaterials in liquid crystals has recently emerged as a promising way for the design of advanced and tunable electro-optical materials. The goal of this paper is a broad overview of the current technology, basic physical properties, and applications of ferroelectric nanoparticle/liquid crystal colloids. By compiling a great variety of experimental data and discussing it in the framework of existing theoretical models, both scientific and technological challenges of this rapidly developing field of liquid crystal nanoscience are identified. They can be broadly categorized into the following groups: (i) the control of the size, shape, and the ferroelectricity of nanoparticles; (ii) the production of a stable and aggregate-free dispersion of relatively small (~10 nm) ferroelectric nanoparticles in liquid crystals; (iii) the selection of liquid crystal materials the most suitable for the dispersion of nanoparticles; (iv) the choice of appropriate experimental procedures and control measurements to characterize liquid crystals doped with ferroelectric nanoparticles; and (v) the development and/or modification of theoretical and computational models to account for the complexity of the system under study. Possible ways to overcome the identified challenges along with future research directions are also discussed.

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Thermodynamical, optical, electrical and electro-optical studies of a room temperature nematic liquid crystal 4-pentyl-4′-cyanobiphenyl dispersed with barium titanate nanoparticles

Cited by 70 publications

References 40 publications

Perspectives in Liquid-Crystal-Aided Nanotechnology and Nanoscience

Perspectives in Liquid-Crystal-Aided Nanotechnology and Nanoscience

Impact of Dispersion of Nanoscale Particles on the Properties of Nematic Liquid Crystals

Ferroelectric Nanoparticles in Liquid Crystals: Recent Progress and Current Challenges

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