Mesogenic 4-pentyl-4′-cyanobiphenyl (5CB) is a commonly used dielectric material for display devices and liquid crystal biosensors. A small concentration of ZnO nanoparticles was dispersed in 5CB nematic liquid crystals by the chemical precipitation method. The phase changes, phase retardation, and transition temperature of the prepared samples were studied by polarizing optical microscopy (POM) and differential scanning calorimetry analysis. The dielectric properties were measured by dielectric spectroscopy, which was performed within the frequency range from 1 Hz to 10 MHz. A novel phase was identified and confirmed by the dielectric parameters in dispersed ZnO 5CB (N5CB). Specifically, the temperature dependence of relaxation times was estimated for both the samples, which strengthen the POM studies and the influence of nanoparticles on the lattice arrangement. The temperature dependence and the dispersion effect of ZnO nanoparticles on the dielectric constant and dielectric losses were also studied. The sensitivity of mesogenic phases to external forces was confirmed through the present work. From all these results, it has been concluded that N5CB finds potential application in the preparation of fast switching devices.
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Abstract of article is published in Zhurnal Prikladnoi Spektroskopii, Vol. 89, No. 3, p. 437, May–June, 2022.
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Raju, K.V.S.N., Begum, S.S., Madhav, B.T.P. et al. Optical and Dielectric Properties of ZnO Nematic Liquid Crystals Prepared by the Chemical Precipitation Method. J Appl Spectrosc 89, 602–611 (2022). https://doi.org/10.1007/s10812-022-01400-x
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DOI: https://doi.org/10.1007/s10812-022-01400-x