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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
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.
ISSN: 0021-4922
1347-4065 (online)
Alternative Location:
Copyright: (2006) by The Japan Society of Applied Physics
Appears in Collections:Research Papers (SCM)

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