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Title: Ionic contribution to the dielectric properties of a nematic liquid crystal in thin cells
Authors: Dhara, Surajit
Madhusudana, N.V.
Issue Date: 1-Oct-2001
Publisher: The American Institute of Physics
Citation: Journal of Applied Physics, 2001, Vol.90, p3483-3488
Abstract: We report measurements on dielectric properties of a nematic liquid crystal in planar aligned cells with two different thicknesses (1.2 and 6.7 µm). The nematic has a wide thermal range and the temperature variation of the effective dielectric constant (epsilon[perpendicular]) of the thick cell reflects that of the orientational order parameter. On the other hand, the thin cell exhibits a higher value of epsilon[perpendicular] which is essentially temperature independent. We have conducted detailed dielectric measurements in the frequency range of 10 Hz–1.1 kHz on both the cells and analyzed the data using a simplified model which takes into account the ionic contribution. It leads to an estimation of the temperature dependencies of the number density and diffusion coefficient of the impurity ions.
ISSN: 0021-8979
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Copyright: (2001) by the American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.
Appears in Collections:Research Papers (SCM)

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