Molecular dynamics in weakly polar nematic liquid crystal doped with dye

Yadav, Satya Prakash; Pandey, Kamal Kumar; Misra, Abhishek Kumar; Dixit, Sudhaker; Manohar, Rajiv

doi:10.1139/p11-035

Cited by 6 publications

(3 citation statements)

References 17 publications

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“…The generated electric field would be localized but it would have some effect on the polarization though it will be a feeble one. Thus, the value of average dielectric permittivity decreases with increase in the concentration of the dopant .…”

Section: Resultsmentioning

confidence: 97%

Effects of polymer doping on dielectric and electro-optical parameters of nematic liquid crystal

et al. 2014

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Poly(isobutyl methacrylate) (PiBMA) polymer doped in pure p‐Ethoxybenzylidene p‐Heptylaniline (EBHA) mesomaterial has been investigated in the present study. The dielectric and electro‐optical parameters of EBHA having nematic phase were altered due to the addition of polymer in different concentration. The strong dopant concentration dependent nature of negative dielectric anisotropy and conductivity are the interesting results of the present polymer doped nematic liquid crystal (NLC) system. The present composite shows its useful application in low charge consumable devices due to the easy charge transportation phenomenon. The investigated polymer doped‐NLC system exhibiting increased negative dielectric anisotropy and high conductivity may prove to be advantageous for video applications in vertically aligned cells. POLYM. ENG. SCI., 55:414–420, 2015. © 2014 Society of Plastics Engineers

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Section: Resultsmentioning

confidence: 97%

Effects of polymer doping on dielectric and electro-optical parameters of nematic liquid crystal

et al. 2014

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“…Physical properties of LC such as optical and dielectric parameters, rotational viscosity, temporal characteristics, molecular dynamics, etc. [76,119,120,123,[144][145][146][147][148][149].…”

Section: Hysteresis Effectmentioning

confidence: 99%

An Overview of Polymer-Dispersed Liquid Crystals Composite Films and Their Applications

Katariya-Jain¹,

Deshmukh²

2020

Liquid Crystals and Display Technology

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Inherent and incredible properties of liquid crystals (LC) such as optical and dielectric anisotropy make them special candidates for flat-panel display devices; bi-stable reflective displays; high-definition spatial light modulators; switchable windows; haze-free normal-and reverse-mode light shutter devices; projectors; optical, thermal and strain sensors; tuneable lenses; etc. Non-linear response of LC material to the applied electric field is very useful in the above-mentioned applications. When a low molecular weight LC material is doped in a high molecular weight polymer matrix to obtain polymer-dispersed liquid crystal (PDLC) films, it offers flexibility and mechanical strength (structural stabilization) to the composite films-PDLC devices. Depending upon the concentration of monomer/polymer, these composite films are classified as polymer-stabilized liquid crystal (PSLC), PDLC and holographic PDLC (HPDLC) films. Depending upon the process conditions, we get phase-separated randomly dispersed micron-sized LC droplets in a continuous polymer matrix. These nematic LC droplets exhibit light scattering transmission properties depending on their orientation, which can be controlled by external electric field. This chapter gives deep insight about operating principle, phase separation techniques involved, alignment of LC and controlling LC droplet morphology of PDLC films to obtain desired properties. In order to improve the optical efficiency and to obtain the desired result from PDLC films, various guest entities such as dye and nanomaterials are doped in the host LC material. This chapter also accounts for various possible LC dopants desired for improving the electro-optic (EO) and dielectric properties of PDLC devices. Various applications of PDLC composite films are also described in this chapter.

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“…Many reports have been presented to study these weakly polar nematic LCs which explain the dielectric properties with the help of dynamics of molecule. [7,8] Oka et al have done the comparative study of weakly polar and non-polar NLCs. They suggested that the strength of dipole moment has little influence on the liquid crystalline properties.…”

Section: Introductionmentioning

confidence: 99%

Improved dielectric and electro-optical parameters of nematic liquid crystal doped with magnetic nanoparticles

et al. 2019

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This study investigates the effect of magnetic nanoparticles (NPs) on the weakly polar nematic liquid crystal (NLC). Different parameters of dielectric data were measured for both the homeotropic and planar aligned samples as a function of frequency and temperature and the substantial changes have been noticed for the doped systems. Dielectric permittivity has been increased after the dispersion of magnetic NPs in the pure NLC. Dielectric anisotropy has also been influenced by incorporating the magnetic NPs with the NLC molecules. These results were attributed to the dipole-dipole interaction between the magnetic nanoparticles and nematic liquid crystal molecules. Electro-optical study indicated the faster rise time and fall time of the doped systems as compare to pure NLC. Threshold voltage has been calculated and found to be decreased for the doped systems. Moreover, we have also calculated the rotational viscosity and the splay elastic constant for pure and the doped systems. Both the rotational viscosity and splay elastic constant of the doped systems are found to be considerably lower than those of pure NLC. Change in these properties has been explained on the basis of molecular disturbances created by the interaction between the magnetic nanoparticle and LC director. This study reveals that the inclusion of magnetic NPs in weakly polar NLC can be useful to enhance the basic properties of the weakly polar NLC and make it a promising material for many display applications.

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Molecular dynamics in weakly polar nematic liquid crystal doped with dye

Cited by 6 publications

References 17 publications

Effects of polymer doping on dielectric and electro-optical parameters of nematic liquid crystal

Effects of polymer doping on dielectric and electro-optical parameters of nematic liquid crystal

An Overview of Polymer-Dispersed Liquid Crystals Composite Films and Their Applications

Improved dielectric and electro-optical parameters of nematic liquid crystal doped with magnetic nanoparticles

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