Dielectric Investigation of a Bent-Core Liquid-Crystalline Material and Its Mixture with a Rod-Like Compound

Abstract

The dielectric relaxation behavior of a bent-core liquid-crystalline (BC) material showing B₂ phase and its 17% mixture with another rod-like material (R-BC) has been investigated. The appearance of a newly induced B₁ phase has been detected in the R-BC system. We found comparatively lower value of dielectric permittivity of the R-BC system than that of BC material. Moreover, a lower value of relaxation frequency of the long axis rotation mode in BC material compared to that of the R-BC material has been observed. These results have been discussed on the basis of molecular origin for the formation of B phases in the materials.

Keywords:

• Bent-core molecules
• dielectric relaxation
• induced phase
• mixture of bent-core and rod-like molecules

Acknowledgment

The authors are grateful to the Council of Scientific & Industrial Research, government of India, for the research grant and fellowship to carry out this project. We also thank Prof. K. C. Majumdar of the Department of Chemistry, University of Kalyani, Kalyani, India, for providing us with the sample.

Notes

Present address for Surjya Sarathi Bhattacharyya: Information and Display Laboratory, Department of Polymer and Nano Engineering, Chonbuk National University, 664-14 1GA Deokjin-Dong, Jeonju City-561-756, Jeonbuk, South Korea.