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Determination of dielectric properties of 5CB nematic liquid crystal doped with new chiral calamitic compounds

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Abstract

Nematic liquid crystals are widely used in display technologies. In this research area, nematic liquid crystals (LCs) are doped with different LC materials to obtain modified LC properties which response desired physical properties in display technology. Here, the dielectric properties of 5CB (4-cyano-4′-pentylbiphenyl) nematic liquid crystal which was doped with two pyridine-based chiral calamitic compounds with different number of aromatic rings as well as a branched chiral side chain, which is (S)-3,7-dimethyloctyloxy were investigated. The new composites of non-mesomorphic 4-((S)-3,7-dimethyloctyloxy)phenyl 6-chloronicotinate (Cr) and (4-[4-((S)-3,7-dimethyloctyloxy) phenoxycarbonyl] phenyl 6-chloronicotinate (LC) which exhibits enantiotropic SmA mesophase were prepared using 2 wt% and 5 wt% with respect to the 5CB. The effects of doping with 2 wt% and 5 wt% of new chiral calamitics on dielectric properties of 5CB have been investigated at room temperature. The dielectric parameters (\({\epsilon }^{{\prime }}\), \({\epsilon }^{{\prime \prime }}\), \({\Delta }\epsilon\) (dielectric strength), \(f_\mathrm r\) (relaxation frequency) were determined by dielectric spectroscopy method. The real part of the dielectric constants increases as 2%, 5% LC are added to 5CB, and decreases as 2%, 5% Cr are added to 5CB. It was observed that the diameter of the Cole–Cole graphs, \({\Delta }\epsilon\) and \({\epsilon }_{\text {max}}^{{\prime \prime }}\)data increased with the addition of LC to 5CB, and the two liquid crystal mixture improved the dielectric properties of the material. It has been also determined that adding LC to 5CB, increases the concentration dependent dielectric strength.

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Acknowledgements

This work has been supported by the Yildiz Technical University Scientific Research Projects Coordination Department under Project Number: FBA-2021-4516.

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The authors declare that no funds, grants, or other support were received during the preparation of this manuscript.

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Authors and Affiliations

  1. Department of Physics, Yildiz Technical University, 34210, Istanbul, Turkey

    N. Yilmaz Canli, D. Özükanar & P. Kavak

  2. Department of Chemistry, Yildiz Technical University, 34210, Istanbul, Turkey

    D. Vardar, H. Ocak & B. Bilgin Eran

  3. Vocational School of Health Sciences, Biomedical Device Technology Programme, Izmir Democracy University, Konak, 35290, Izmir, Turkey

    A. Asikoglu Bozkurt

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  1. N. Yilmaz Canli
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Contributions

The authors have no relevant financial or non-financial interests to disclose. All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by NYC, DÖ, DV, PK, AAB, HO and BBE. The first draft of the manuscript was written by NYC and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript. All data generated or analysed during this study are included in this published article.

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Canli, N.Y., Özükanar, D., Vardar, D. et al. Determination of dielectric properties of 5CB nematic liquid crystal doped with new chiral calamitic compounds. J Mater Sci: Mater Electron 34, 1304 (2023). https://doi.org/10.1007/s10854-023-10735-w

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