Static Dielectric Studies of Two Nematogenic Compounds

Gopalakrishna, Deepak; Somashekar, R.; Revannasiddaiah, D.

doi:10.1080/15421400590954588

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2009

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“…Further, the average value of the dielectric permittivities " av in the N phase is found to be lower than that of its extrapolated isotropic value. This is in accordance with the theory and the results reported by the earlier investigators for strongly polar and non-polar liquid crystalline materials [28][29][30][31]. At the N-SmB transition, " 0 k goes down whereas " 0 ?…”

Section: Resultssupporting

confidence: 94%

Dielectric investigations in the nematic and hexatic smectic B phases of 4-hexyl-4′-[2-(4-isothiocyanatophenyl)ethyl]-1,1′-biphenyl

2009

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Temperature-dependent dielectric characterization of 4-hexyl-4 0 -[2-(4-isothiocyanatophenyl)ethyl]-1,1 0 -biphenyl (HIEB), which exhibits smectic B and nematic phases, has been carried out over the frequency range of 1 Hz to 10 MHz for homeotropic and planar alignment of sample molecules. This compound shows positive dielectric anisotropy (Á" ¼ " k À " ? 40) in the nematic (N) phase. One mode of dielectric relaxation showing Arrhenius behaviour has been detected in the hexatic smectic B (SmB) phase. Various electrical parameters, namely, dielectric anisotropy, relaxation frequency and activation energy, have been determined in the N and SmB phases.

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Section: Resultssupporting

confidence: 94%