Dielectric Anisotropy Properties of BAC-Doped 5CB Liquid Crystal

Abstract

Dielectric anisotropy properties and splay elastic constant, K₁₁ for 5CB (4-cyano-4’-pentylbiphenyl) plus 1% BAC(4-[4-(S)-2-methylbutoxybenzoyloxy]benzoic acid] have been investigated. The frequency dependent dielectric anisotropy and splay elastic constant have been calculated by using capacitance-voltage curves for various frequencies. The critical frequency, f_c values of dielectric anisotropy for 4-cyano-4′-pentylbiphenyl (5CB) and 5CB+(1%)BAC composites were found to be 433.5 kHz and 439.5 kHz, respectively. It has been determined that BAC doping to 5CB decreases both threshold voltages and splay elastic constants for all frequencies applied. The decrease in K₁₁ values has been interpreted as the decrease of distortion in the system.

Keywords:

• 4-[4-(S)-2-Methylbutoxybenzoyloxy]benzoic liquid crystal acid
• 5CB liquid crystal
• dielectric anisotropy
• splay elastic constant

Acknowledgments

This work has been supported by the Scientific and Technological Research Council of Turkey (TUBITAK) with the project number: 111T102. This work has also been supported by Yildiz Technical University Scientific Research Projects Coordination Department under Project number: 2014-01-01-GEP05. Moreover, the authors would like to thank Hale Ocak for polarizing microscope photographs.