Effect of dye dispersion on the relaxation modes of smectic C* phase

Yadav, Satya Prakash; Pande, Mukti; Manohar, Rajiv; Singh, Shri

doi:10.1080/02678292.2013.824120

Cited by 12 publications

(3 citation statements)

References 21 publications

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“…35 Different relaxation modes of the smectic phase have also been disclosed. 36 The aforementioned interesting observations inspired us to investigate the dielectric properties of certain known FLCs that were resynthesized in this study. In particular, we intended to work on three FLCs, namely (S)-4-(((4-(octan-2yloxy)phenyl)imino)methyl)phenyl 4-(n-octyloxy)benzoate, (S)-4-(((4-(octan-2-yloxy)phenyl)imino)methyl)phenyl 4-(ndecyloxy)benzoate and (S)-4-(((4-(octan-2-yloxy)phenyl) imino)methyl)phenyl 4-(n-undecyloxy)benzoate which are hereafter, respectively, referred as SB(S)-8, SB(S)-10 and SB(S)-11.…”

Section: Introductionmentioning

confidence: 99%

Dielectric study of three homologous Schiff base ferroelectric liquid crystals with the variations of temperature and frequency

et al. 2020

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In this investigation, the dielectric behaviors of three ferroelectric liquid crystals (FLCs) belonging to a homologous series have been revealed in the frequency range of 10 Hz–10 MHz. FLCs used in this study are three-ring calamitic LCs, namely ([Formula: see text])-4-(((4-(octan-2-yloxy)phenyl)imino)methyl)phenyl 4-([Formula: see text]-octyloxy)benzoate, ([Formula: see text])-4-(((4-(octan-2-yloxy)phenyl)imino)methyl)phenyl 4-([Formula: see text]-decyloxy)benzoate and ([Formula: see text])-4-(((4-(octan-2-yloxy)phenyl)imino)methyl)phenyl 4-([Formula: see text]-undecyloxy)benzoate. The polarizing optical microscopic and differential scanning calorimetric results confirm that these compounds, synthesized as per the known synthetic steps, show not only a ferroelectrically switchable chiral smectic C (SmC[Formula: see text]) phase over a wide thermal range, but also other mesophases such as blue phase-I/II (BP-I/II), chiral nematic (N[Formula: see text]) and unknown smectic (SmX) phases. Several essential dielectric parameters of the FLC phase have been measured at different temperatures. The relative permittivity has been measured with the variations of temperature and frequency. Besides, the dielectric loss and tan [Formula: see text] have been measured. Different dielectric relaxations have been calculated and explained at the molecular level. The systematic measurements revealed a strong anomaly, and crossover of relative permittivity values for the FLCs has been determined at selective frequencies between 1 kHz and 20 kHz. Strong dielectric anomaly/fall for the response function infers the involvement of collective response of dipolar assembly confined to ferroelectric Weiss domains.

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Section: Introductionmentioning

confidence: 99%

Dielectric study of three homologous Schiff base ferroelectric liquid crystals with the variations of temperature and frequency

et al. 2020

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“…This NLC-dye system has also many applications in displays. Display features can be improved by synthesize a new liquid crystal material [4] or by dispersion of dyes [5,6], polymers [7], and nanoparticles [8][9][10] in LCs. To enhance the optical parameters, dye may play a very much important role as a dopant.…”

Section: Introductionmentioning

confidence: 99%

Dispersion of fluorescent dye in the nematic liquid crystal: Enhanced photoluminescence and high birefringence

Pathak¹,

Agrahari²,

Roy³

et al. 2018

Opto-Electronics Review

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In the present investigation optical, electro-optical and dielectric properties have been measured for nematic liquid crystal (NLC) material 1550C which consists of 4'-(trans, trans-4-alkylbicyclohexyl) carbonates and 4'-(4-(trans,trans-4-alkyl)-4-cyanobicyclohexane, dispersed with fluorescent dye (Benzo 2,1,3 Thiadiazole) in two different concentrations. Photoluminescence has been enhanced for a dye dispersed system which is the key finding of this investigation. UV absorbance study has also been performed and found to be increased for composite system. Enhanced birefringence after dispersion of dye into pure NLC is also a prominent result of this investigation. Relative permittivity, threshold voltage and dielectric anisotropy have also been measured and found to be increased. The outcome of the present work may be very useful in the construction of liquid crystal displays (LCDs).

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“…These post synthesis methods are much faster and easier to alter the LC properties and also cost effective. The dispersion of dyes, [3,4] polymers, [5] CNTs [6,7] and different nanoparticles (NPs) [8][9][10] in LCs has emerged as an area of great interest. Some achievement towards the enhancement of LCD parameters such as reduced driving voltage, improved voltage holding ratio, high contrast and faster response has been realised, recently.…”

Section: Introductionmentioning

confidence: 99%

Effect of TiO₂nanoparticles dispersion on ionic behaviour in nematic liquid crystal

2015

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The present study focuses on the ionic behaviour in nanoparticles (NPs) dispersed nematic liquid crystal. Dielectric spectroscopy has been used to investigate the behaviour of ions in suspension of NPs and liquid crystal (LC). Ionic concentration, diffusion coefficient, activation energy and mobility have been calculated from dielectric data. It is found that ion concentration increases initially and then it decreases with increasing concentration of NPs in suspension. The initial increase in ion concentration is attributed to the insertion of more ions due to impurities of TiO 2 NPs and various other reasons. Temperature dependence of diffusion constant for different loading of TiO 2 NPs is also investigated. The activation energy of NPs dispersed LC is found to be lower than the pristine one and it decreases with increasing concentration of NPs. The decreasing DC conductivity with increasing NPs concentration is attributed to the hindered or restricted motion of ions in the suspension. It is proposed that TiO 2 NPs may be a potential candidate to be used to suppress the undesired ionic effect in LCs.

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Effect of dye dispersion on the relaxation modes of smectic C* phase

Cited by 12 publications

References 21 publications

Dielectric study of three homologous Schiff base ferroelectric liquid crystals with the variations of temperature and frequency

Dielectric study of three homologous Schiff base ferroelectric liquid crystals with the variations of temperature and frequency

Dispersion of fluorescent dye in the nematic liquid crystal: Enhanced photoluminescence and high birefringence

Effect of TiO₂nanoparticles dispersion on ionic behaviour in nematic liquid crystal

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Effect of dye dispersion on the relaxation modes of smectic C* phase

Cited by 12 publications

References 21 publications

Dielectric study of three homologous Schiff base ferroelectric liquid crystals with the variations of temperature and frequency

Dielectric study of three homologous Schiff base ferroelectric liquid crystals with the variations of temperature and frequency

Dispersion of fluorescent dye in the nematic liquid crystal: Enhanced photoluminescence and high birefringence

Effect of TiO2nanoparticles dispersion on ionic behaviour in nematic liquid crystal

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Effect of TiO₂nanoparticles dispersion on ionic behaviour in nematic liquid crystal