Title:	Characterization of nematic phase of banana liquid crystal
Authors:	Le, Khoa Van Dhara, Surajit Sadashiva, B.K. Takanishi, Yoichi Takezoe, Hideo
Keywords:	banana liquid crystal nematic phase pretilt angle birefringence dielectric constant order parameter
Issue Date:	15-Sep-2006
Publisher:	The Japanese Society of Applied Physics
Citation:	Japanese Journal of Applied Physics, 2006, Vol.45, pL1013-L1015
Abstract:	We report the first detailed optical and electrical characterizations of the nematic (N) phase of a banana liquid crystal, i.e., pretilt angle, and optical and dielectric anisotropies, and point out the difference from those of rodlike molecules. The pretilt angle measurements using a conventional crystal rotation method show that the pretilt angle is very small (less than 1°) even in cells with a polyimide film yielding a high pretilt angle like 8° for calamitic molecules. We also measured the birefringence Δn in the N phase as a function of temperature and estimated the orientational order parameter S. The medium shows a small negative dielectric anisotropy in the N phase and the anisotropy becomes large in the B2 phase mainly because of the tilt of the molecules from the layer normal.
Description:	Restricted Access.
URI:	http://hdl.handle.net/2289/1650
ISSN:	0021-4922 1347-4065 (online)
Alternative Location:	http://jjap.ipap.jp/link?JJAP/45/L1013/ http://dx.doi.org/10.1143/JJAP.45.L1013
Copyright:	(2006) by The Japan Society of Applied Physics
Appears in Collections:	Research Papers (SCM)

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