Blue phase liquid crystal phase transition for cyano compound chiral nematic liquid crystal mixtures with three two-ring core structures and chiral dopant concentrations

ABSTRACT

Blue phase (BP) temperature range of a chiral nematic liquid crystal (LC) mixture is dependent upon the host nematic LC chemical structure and chiral dopant concentration. In this study, we investigated BP phase transition behaviour and helical twisting power (HTP) using three chiral dopant concentrations of cyano compound chiral nematic LC mixtures incorporating three two-ring core structures in the host nematic LCs. The effect of the host nematic LC core structure, HTP and chiral dopant concentrations were considered on BP temperature ranges, for two types of complete BPI and BPII without isotropic phase (Iso) and two types of coexistence state of BPI+Iso and BPII+Iso.

KEYWORDS:

• Chiral nematic liquid crystal
• blue phase
• temperature range
• core structure
• chiral dopant concentration
• helical twisting power

Acknowledgments

We thank Professor Kikuchi for providing the chiral dopant, ISO-(6OBA)₂. Also we thank JNC Co. Ltd. for providing the nematic LC mixture, JC-1041XX.

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This study was supported by a grant from the World Class 300 Project, Small and Medium Business Administration (SMBA), Republic of Korea [grant number 2341055].