Anomalous Behaviors of the Electrical Dissipative Power in Cholesteric Liquid Crystal with Long Pitch

概要

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The electric power is measured in nematic p-methoxy benziliden p'-n butyl aniline(MBBA) and mixtures of MBBA and cholesteryl nonanoate (CN). The powerincreases linearly against to the square of the supplied voltage below the thresholdvoltage V., where the electrohydrodynamic instability occures. To see explicitlythe increment of the power, the excess power is computed by subtracting the powerobtained by the extrapolation of the ohmic relation from the measured power.Increasing the voltage, the excess power increases remarkably above V.. In thecholesteric case, however, the excess power accompanied with the convectioztdecreases anomalously above about 2V.. This corresponds to the restabilizationof the cholesteric planar texture with the pitch contraction. The difference ofthe transition-scheme between nematic (MBBA) and cholesteric (MBBAfCN) isdiscussed, and new term "exchar)ge transition" is proposed for the electro-hvdrodvnamic instabilitv in cholesteric.
社団法人日本物理学会の論文
1978-10-15