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Syntheses and mesomorphic properties of laterally fluorinatedphenyl isothiocyanatotolanes and their high birefringent mixtures

Dziaduszek J., Dąbrowski R., Ziółek A., Gauza S., Wu S. T.

Opto-Electronics Review

2009

Vol. 17, No. 1

20-24

Syntheses and mesomorphic properties of di-, tri- and tetrafluorosubstituted 4'-(4-alkylphenyl)-4-isothiocyanatotolanes are described. Four fluorine substituted compounds in the position 2', 3', 3, and 5 show stronger nematic character than difluorosubstituted ones in the position 3, 5 or 2', 3'. Example of high birefringence nematic mixture and its properties are given.

Low viscosity, high birefringence liquid crystalline compounds and mixtures

Dąbrowski R., Dziaduszek J., Ziółek A., Szczuciński Ł., Stolarz Z., Sasnouski G., Bezborodov V., Lapanik W., Gauza S., Wu S. T.

Opto-Electronics Review

2007

Vol. 15, No. 1

47-51

Two types of fast switching mixtures with high positive dielectric anisotropy were described. The first type, with a birefringence below 0.3, was designed for devices operating at room or lower temperatures and the second one, with a birefringence higher than 0.3 for devices operating at elevated temperatures.

Induced Antiferroelectric Phases in Multicomponent Systems

Dąbrowski R., Otón J. M., Urruchi V., Gayo J. L., Czupryński K., Gauza S.

Polish Journal of Chemistry

2002

Vol. 76 / nr 2-3

331-344

Materials with induced antiferroelectric phase (SmCA * ) composed of components having synclinic (SmC* _) or orthogonal (SmA) phases have been studied. The characterization included profiles of light transmission curves, response times, threshold, saturation and holding voltages, grey scale, static and dynamic contrast ratio and cone angle between (+) and (-) ferroelectric states. The mixture A70-B30 showed V-shaped (thresholdless) switching, while the mixture 115-C85 showed a threshold with a broad hysteresis curve of tristate antiferroelectrics.