Enhanced dielectric properties of Nematic liquid crystal doped with ferroelectric nanoparticles

Nasri, Rawia; Missaoui, Tayssir; Hbibi, Ahlem; Soltani, Taoufik

doi:10.1080/02678292.2021.1876934

Cited by 20 publications

(4 citation statements)

References 43 publications

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“…For example, it decreases from 1.7 for 7OBAF/8OBA to 1.3 for 10OBAF/8OBA. Similar behavior has been observed in other nematic LCs; for example, Δε of 5CB (Δε = 12) [37] is higher than that of 8CB (Δε = 8.5) [38,39].…”

Section: Dielectric Propertiessupporting

confidence: 84%

Synthesis, thermal, dielectric and electro-optic properties of new series of fluorinated hydrogen-bonded liquid crystals

Derbali

Soltani

Guesmi

et al. 2022

Journal of Molecular Liquids

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Section: Dielectric Propertiessupporting

confidence: 84%

Synthesis, thermal, dielectric and electro-optic properties of new series of fluorinated hydrogen-bonded liquid crystals

Derbali

Soltani

Guesmi

et al. 2022

Journal of Molecular Liquids

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“…Dielectric response of LC materials show complex behaviour and provides information about molecular polarizability and dipole moment when an electric field is applied. The complex dielectric constant acts as the most considerable parameter in determining the dielectric behaviour of LCs and is given by the following formula [33,34]:…”

Section: Resultsmentioning

confidence: 99%

The Role of Rubrene Concentration on Dielectric Parameters of Nematic Liquid Crystal

KOCAKÜLAH

2023

Hittite Journal of Science and Engineering

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In this study, the dielectric parameters of E7 coded nematic liquid crystal (NLC) composites containing the different amounts of rubrene fluorescent dye were investigated. E7, E7+0.5 wt.% Rubrene, and E7+1.0 wt.% Rubrene samples were prepared. Frequency dependent dielectric constants (ɛ′ and ɛ′′), dielectric anisotropy (Δε′), and ac conductivity (σac) graphs of rubrene doped E7 NLC composites were obtained by dielectric spectroscopy method and compared with pure E7 NLC. By using these graphs, relaxation frequency (fR), relaxation time (τR), dielectric strength (δɛ′), and crossover frequency (fc) parameters of the E7 NLC and its rubrene doped composites were determined. An increase in fR from 3.045 MHz to 3.697 MHz for 0 V and from 627 kHz to 686 kHz for 40 V was observed with increasing rubrene concentration. On the other hand, a decrease in τR from 0.052 μs to 0.043 μs for 0 V and from 0.254 μs to 0.232 μs for 40 V was seen with increasing rubrene concentration. Furthermore, an increase in fc from 1.145 MHz to 1.298 MHz was obtained with increasing rubrene concentration. The results show that the dielectric parameters change with the concentration of rubrene and it is thought that this study will provide a basis for investigating the dielectric properties of rubrene doped NLC composites. Moreover, it is concluded that the produced composites are a suitable base material for electro-optical device applications such as smart displays, photonics and electrical circuit elements.

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“…For the endogenic impacts, molecular admixtures [ 7 ] or solid-state nanoparticle (NP) additions are notable [ 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 ]. Their influence is so significant that a new category of LC + NP nanocolloids and nanocomposites was established [ 8 , 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

The Dominance of Pretransitional Effects in Liquid Crystal-Based Nanocolloids: Nematogenic 4-methoxybenzylidene-4′–butylaniline with Transverse Permanent Dipole Moment and BaTiO3 Nanoparticles

Drozd-Rzoska,

Łoś,

Rzoska

2024

Nanomaterials

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The report presents static, low-frequency, and dynamic dielectric properties in the isotropic liquid, nematic, and solid phases of MBBA and related nanocolloids with paraelectric BaTiO3 nanoparticles (spherical, d = 50 nm). MBBA (4-methoxybenzylidene-4′–butylaniline) is a liquid crystalline compound with a permanent dipole moment transverse to the long molecular axis. The distortions-sensitive analysis of the dielectric constant revealed its hidden pretransitional anomaly, strongly influenced by the addition of nanoparticles. The evolution of the dielectric constant in the nematic phase shows the split into two regions, with the crossover coinciding with the standard melting temperature. The ‘universal’ exponential-type behavior of the low-frequency contribution to the real part of the dielectric permittivity is found. The critical-like pretransitional behavior in the solid phase is also evidenced. This is explained by linking the Lipovsky model to the Mossotti catastrophe concept under quasi-negative pressure conditions. The explicit preference for the ‘critical-like’ evolution of the apparent activation enthalpy is worth stressing for dynamics. Finally, the long-range, ‘critical-like’ behavior of the dissipation factor (D = tgδ), covering the isotropic liquid and nematic phases, is shown.

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Enhanced dielectric properties of Nematic liquid crystal doped with ferroelectric nanoparticles

Cited by 20 publications

References 43 publications

Synthesis, thermal, dielectric and electro-optic properties of new series of fluorinated hydrogen-bonded liquid crystals

Synthesis, thermal, dielectric and electro-optic properties of new series of fluorinated hydrogen-bonded liquid crystals

The Role of Rubrene Concentration on Dielectric Parameters of Nematic Liquid Crystal

The Dominance of Pretransitional Effects in Liquid Crystal-Based Nanocolloids: Nematogenic 4-methoxybenzylidene-4′–butylaniline with Transverse Permanent Dipole Moment and BaTiO3 Nanoparticles

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