Advanced liquid crystals for television

Pauluth, Detlef; Tarumi, Kazuaki

doi:10.1039/b400135b

Cited by 239 publications

(187 citation statements)

References 12 publications

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“…Difluorinated alkoxy compounds are suitable for preparation of VA mixtures because of their large negative dielectric anisotropy and low optical birefringence. Moreover, the recently synthesized terphenyl derivatives with lateral fluorine substitution have the additional advantage of low rotational viscosity, while keeping the birefringence moderately low as required for VA mode applications [14].…”

Section: Introductionmentioning

confidence: 99%

Determination of Orientational Order Parameters of Two Tri-Component Mixtures from Optical Birefringence and X-Ray Diffraction Measurements

Basak¹,

Dasgupta²,

Das³

et al. 2011

Acta Phys. Pol. A

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Two tri-component mixtures as base mixtures for vertically aligned mode LCD's were prepared. The eutectic compositions were theoretically estimated and experimentally verified from differential scanning calorimetry studies. A room temperature nematic mixture with fairly broad operating range emerged from each of the tri-component mixtures. The optical birefringence of these mixtures at the eutectic composition was measured as a function of temperature. X-ray diffraction measurements were done on these mixtures to obtain the orientational order parameters as a function of temperature. The order parameter values were also determined from birefringence measurements and the results were compared with mean field theory. Structural parameters like intermolecular distance and apparent molecular length have also been determined.

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Section: Introductionmentioning

confidence: 99%

Determination of Orientational Order Parameters of Two Tri-Component Mixtures from Optical Birefringence and X-Ray Diffraction Measurements

Basak¹,

Dasgupta²,

Das³

et al. 2011

Acta Phys. Pol. A

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“…All these factors create additional sources of ions of organic origin [82]. However, recent advances in the chemical synthesis of novel liquid crystal materials exhibiting improved chemical stability reduced the probability of such events significantly [83][84][85][86]. Liquid crystals can get contaminated with ionic impurities during the process of chemical synthesis.…”

Section: Classical Methods Of Liquid Crystal Purificationmentioning

confidence: 99%

“…By applying the proper chemical design along with the methods of chemical synthesis and post-synthetic techniques, many improved liquid crystal materials were successfully produced and tested in numerous applications [2,28,[83][84][85][86]. The high resistivity liquid crystals are characterized by extremely low levels of ionic impurities.…”

Section: Practical Example: Electro-optics Of Highly Purified Liquid mentioning

confidence: 99%

Nano-Objects and Ions in Liquid Crystals: Ion Trapping Effect and Related Phenomena

2015

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Abstract:The presence of ions in liquid crystals is one of the grand challenges that hinder the application of liquid crystals in various devices, which include advanced 3-D and flexible displays, tunable lenses, etc. Not only do they compromise the overall performance of liquid crystal devices, ions are also responsible for slow response, image sticking, and image flickering, as well as many other negative effects. Even highly purified liquid crystal materials can get contaminated during the manufacturing process. Moreover, liquid crystals can degrade over time and generate ions. All of these factors raise the bar for their quality control, and increase the manufacturing cost of liquid crystal products. A decade of dedicated research has paved the way to the solution of the issues mentioned above through merging liquid crystals and nanotechnology. Nano-objects (guests) that are embedded in the liquid crystals (hosts) can trap ions, which decreases the ion concentration and electrical conductivity, and improves the electro-optical response of the host. In this paper, we (i) review recently published works reporting the effects of nanoscale dopants on the electrical properties of liquid crystals; and (ii) identify the most promising inorganic and organic nanomaterials suitable to capture ions in liquid crystals.

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“…the short axis of a GB monomer. As for the choice of the exponents, we recall that by integrating the dispersion interaction between a LJ particle and an infinite slab formed by LJ centres, an overall particle-surface potential governed by a (9,3) law is obtained. In the literature, the particle-surface energy is usually modelled with a variety of repulsive and attractive exponents, like the (10, 4) exponents implemented by Steuer et al, 26 and the (9, 3) used by Caprion et al 27 Considering that most common materials mentioned in the Introduction are far from being completely smooth 9,20,21 and also the existence of electrostatic interactions [13][14][15][16][17][18][19] between surfaces and molecules, we have arbitrarily set the repulsive coefficient n to a softer value of 6 to allow for some surface penetration, while keeping m = 3.…”

Section: Surface-monomer Interactionmentioning

confidence: 99%

Effect of nanoconfinement on liquid-crystal polymer chains

Micheletti

Muccioli

Berardi

et al. 2005

The Journal of Chemical Physics

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We apply a Monte Carlo polymerization model for Gay-Berne monomers that we have recently introduced [J. Chem. Phys. 121, 9123 (2004)] to investigate with computer simulations the effects of nanoconfinement and anchoring type on the structure of the main chain liquid-crystal polymers formed in thin films, in the presence of several types of surface alignment: parallel to the interface (random and uniform) or perpendicular to it (homeotropic).We perform first a study of the confined monomers and then we examine the features of the polymer chains obtained from an isotropic or nematic sample. We find a significant effect of the anchoring conditions on the characteristics of the chains and particularly striking differences between planar and homeotropic boundaries. Furthermore, our results indicate that the choice of different anchorings could be used to tune the linearity and degree of polymerization of the chains.

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Advanced liquid crystals for television

Cited by 239 publications

References 12 publications

Determination of Orientational Order Parameters of Two Tri-Component Mixtures from Optical Birefringence and X-Ray Diffraction Measurements

Determination of Orientational Order Parameters of Two Tri-Component Mixtures from Optical Birefringence and X-Ray Diffraction Measurements

Nano-Objects and Ions in Liquid Crystals: Ion Trapping Effect and Related Phenomena

Effect of nanoconfinement on liquid-crystal polymer chains

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