Conductivity and optical bandgap parameters variations of methyl red-doped 4-pentyl-4′-cyanobiphenyl nematic liquid crystal: norland optical adhesive 65 photopolymer composites

Kocakülah, Gülsüm; Köysal, Oğuz

doi:10.1007/s10854-023-10857-1

Cited by 2 publications

(1 citation statement)

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“…et al found that ionic impurities can be easily suppressed by adding methyl red dye in LCs, which leads to a better voltage holding ratio in the system [58]. Different reports are available that show the dispersion of different dyes leads to improved electro-optical and mechanical properties of LCs and reduces the operating voltage considerably [59][60][61][62]. The interdependency of electro-optical characteristics of azo-dye and anthraquinone dyes in polymer-dispersed liquid crystals (PDLCs) has been studied by P. Kumar et al They found that at lower dye concentrations, anthraquinone tends to offer a better contrast ratio as compared to the azo-dyed-LC systems [63].…”

Section: Introductionmentioning

confidence: 99%

Examining Energy Storage Potential in Weakly Polar Nematic Liquid Crystals Infused with Anthraquinone Dye: A Comprehensive Approach

Singh,

Agarwal,

Hatshan

et al. 2023

J. Compos. Sci.

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The applications of liquid crystals in the field of renewable, clean and sustainable technologies of energy storage are of utmost importance at present. This paper delves into dielectric spectroscopic studies of a weakly polar nematic liquid crystal (NLC) enriched with an anthraquinone dye. The primary objective is to assess the impact of increasing dye concentrations on various properties. Anthraquinone dye has been found to increase the dielectric permittivity of weakly polar NLC, leading to a 4.7-fold increase in dielectric anisotropy. Simultaneously, a reduction of around 11% in threshold and operating voltages of the NLC has also been recorded after using dye as the guest material. The added dipolar contributions provided by dye molecules have been attributed to this surplus permittivity. The NLC has been found to have an approximately 54% faster response to the applied field. The intrinsic polarization field of dye molecules accelerates nearby LC molecule reorientation, leading to a 56.5% faster fall time and a 29.8% faster rise time in a 3.0 wt% dye-doped LC cell. These experimental results have been validated via computational studies as well. The simulation results about dipole moment and polarizability provide robust support for our experimental results. Such composites evince their potential for energy storage and 5G communication technologies with adjustable impedance and permittivity.

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