Differential thermal analysis (DTA) and dielectric studies of trans,trans-4'-n-heptyl-bicyclohexyl-4-carbonitrile under high pressure

D. Buesing; T. Brueckert; A. Wuerflinger; B. Gestblom

doi:10.1117/12.299972

1 February 1998 Differential thermal analysis (DTA) and dielectric studies of trans,trans-4'-n-heptyl-bicyclohexyl-4-carbonitrile under high pressure

D. Buesing, T. Brueckert, A. Wuerflinger, B. Gestblom

Author Affiliations +

Proceedings Volume 3318, Liquid Crystals: Physics, Technology, and Applications; (1998) https://doi.org/10.1117/12.299972
Event: Liquid Crystals, 1997, Zakopane, Poland

Abstract

With the aid of differential thermal analysis the phase diagram of trans,trans-4'-n-heptyl-bicyclohexyl-4- carbonitrile (7CCH) established up to 200 MPa, shows stable crystal, nematic and isotropic phases. Dielectric studies on the static and complex permittivity have been performed in the frequency range 1 kHz-13 MHz up to pressures of 200 MPa. The activation parameters for the nematic phase. We find a trend of increasing values for the activation parameters, the retardation factor and the nematic potential, when we compare the heptyl series 7CB, 7PCH, and 7CCH.

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D. Buesing, T. Brueckert, A. Wuerflinger, and B. Gestblom "Differential thermal analysis (DTA) and dielectric studies of trans,trans-4'-n-heptyl-bicyclohexyl-4-carbonitrile under high pressure", Proc. SPIE 3318, Liquid Crystals: Physics, Technology, and Applications, (1 February 1998); https://doi.org/10.1117/12.299972

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