Abstract
Dielectric relaxation dynamics properties of 5CB (4-cyano-4′-pentylbiphenyl) and BAC(4-[4-(S)-2-methylbutoxybenzoyloxy]benzoic acid) have been investigated. In this respect, dielectric properties of 5CB plus (1%)BAC have been compared with 5CB. The polarizing microscopy results show that BAC and 5CB exhibit enantiotropic N* mesophase and N mesophase, respectively. The real (ϵ ′) and imaginary components (ϵ′′) of dielectric constant have been calculated by capacitance method. The dielectric relaxation mechanisms of liquid crystals have been analyzed by Cole-Cole plots and the Debye distribution parameters (α) have been calculated. It has been also determined that adding BAC to 5CB increases the voltage dependent dielectric strength.
Acknowledgments
This work has been supported by the Scientific and Technological Research Council of Turkey (TUBITAK) with the project number: 111T102 and Yildiz Technical University Scientific Research Projects Coordination Department under Project Number: 2014-01-01-GEP05.