Dielectric anisotropy and relaxation studies of the homologous series ofN-(4-n-alkyloxy-2-hydroxy-benzylidene)-4-carbethoxyaniline

Dhar, Ravindra; Gupta, M. K.; Agrawal, Veena; Singh, Manish Kumar

doi:10.1080/01411590701656754

Cited by 8 publications

(3 citation statements)

References 27 publications

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“…The 10-kHz dielectric data has been taken as the 'static' value, as it is free from low-and high-frequency artifacts [9,10] and there seems to be no dispersion mechanism up to this frequency. Further details about the experimental techniques used for the dielectric measurements are given in our earlier publications [11,12].…”

Section: Methodsmentioning

confidence: 99%

Electron beam irradiation induced changes in liquid-crystal compound 5CB

Rath

Sarkar

Wadhawan

et al. 2008

Opto-Electronics Review

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Electron beam irradiation studies on liquid crystal material 5CB have been carried out at a temperature where the compound exists in the isotropic liquid phase. In situ time-resolved spectroscopic characterization was carried out during the irradiation. Three different transients were observed during the 2-μs electron pulse. After about 50 μs, only one transient species was found to be present, which has an absorption peak at 360 nm. Radiolysed sample exhibits a broad absorption at ∼400 nm. The dielectric measurements show that even a low level of irradiation results in a dramatic increase in the component of dielectric permittivity normal to the long axes of the molecules ε⊥′, and a corresponding decrease in the dielectric anisotropy (Δε′=ε∥′−ε⊥′ ). These studies show that 5CB is prone to substantial radiation damage on exposure to the beam of high-energy electrons.

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Section: Methodsmentioning

confidence: 99%

Electron beam irradiation induced changes in liquid-crystal compound 5CB

Rath

Sarkar

Wadhawan

et al. 2008

Opto-Electronics Review

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“…Such a situation is rare but not unheard (see ref. 21 and citations therein). Relaxation frequencies follow Arrhenius equation 21)…”

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confidence: 99%

“…Further, due to the presence of SWCNTs (which have larger dimension as compared to 6CHBT molecules) in the nematic matrix of 6CHBT, number of 6CHBT molecules per unit volume will decrease and it will facilitate flip-flop motion of 6CHBT molecules about their short axes. 20,21) Due to this, relaxation frequency corresponding to the flip-flop motion of the molecules about their short axes increases. Although, according to most general expectation, the presence of nanotubes in the nematic matrix should slow down flip-flop motion about the short axes of the molecules due to heavy structure of natotubes as compared to LC molecules, yet the availability of excess volume slightly overweighs the former effect.…”

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confidence: 99%

Optimization of the Display Parameters of a Room Temperature Twisted Nematic Display Material by Doping Single-Wall Carbon Nanotubes

Dhar

Pandey

et al. 2008

Appl. Phys. Express

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Single-wall carbon nanotubes (SWCNTs) have been doped in the nematic matrix of a room temperature liquid crystalline material 4-(trans-4'-n-hexylcyclohexyl)isothiocyanatobenzene (6CHBT). Effect of SWCNTs doping on various display parameters, namely, threshold voltage, dielectric anisotropy, and splay elastic constant has been studied using electro-optical and dielectric spectroscopy. The nematic phase supports alignment of SWCNTs parallel to the nematic director. On the other hand, the presence of SWCNTs improves local orientational ordering of molecules in the nematic phase. Consequently, the threshold voltage required to switch the molecules from planar (bright state) to homeotropic (dark state) configuration is substantially reduced in the presence of the SWCNTs.

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Frequency Tuned Dielectric and Electrical Properties of a Thermotropic Liquid Crystal Compound 9OBA.

Patari

Nath

2018

Materials Today: Proceedings

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Dielectric anisotropy and relaxation studies of the homologous series ofN-(4-n-alkyloxy-2-hydroxy-benzylidene)-4-carbethoxyaniline

Cited by 8 publications

References 27 publications

Electron beam irradiation induced changes in liquid-crystal compound 5CB

Electron beam irradiation induced changes in liquid-crystal compound 5CB

Optimization of the Display Parameters of a Room Temperature Twisted Nematic Display Material by Doping Single-Wall Carbon Nanotubes

Frequency Tuned Dielectric and Electrical Properties of a Thermotropic Liquid Crystal Compound 9OBA.

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