PVT and dielectric measurements on 4-n-pentyl-4'-cyano-biphenyl (5CB) under high pressure

M. Sandmann; D. Buesing; T. Brueckert; A. Wuerflinger; Stanislaw Urban; B. Gestblom

doi:10.1117/12.299974

1 February 1998 PVT and dielectric measurements on 4-n-pentyl-4'-cyano-biphenyl (5CB) under high pressure

M. Sandmann, D. Buesing, T. Brueckert, A. Wuerflinger, Stanislaw Urban, B. Gestblom

Proceedings Volume 3318, Liquid Crystals: Physics, Technology, and Applications; (1998) https://doi.org/10.1117/12.299974
Event: Liquid Crystals, 1997, Zakopane, Poland

Abstract

With the use of recently developed dilatometric cell pVT data are established for the crystalline, nematic and isotropic phases of 4-n-pentyl-4'-cyanobiphenyl (5CB) up to 300 MPa. A stable and a metastable crystal form can be distinguished. Previous dielectric measurements on 5CB² are extended to higher temperatures with the aid of new dielectric cells, and to higher frequencies that allows one to analyze in more detail the dielectric properties in the isotropic phase. From the dielectric relaxation in the nematic and isotropic phases we derive the activation quantities in the usual way. The paper demonstrates the usefulness of pVT data which are indispensable to separate the different influences of temperature and density.

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M. Sandmann, D. Buesing, T. Brueckert, A. Wuerflinger, Stanislaw Urban, and B. Gestblom "PVT and dielectric measurements on 4-n-pentyl-4'-cyano-biphenyl (5CB) under high pressure", Proc. SPIE 3318, Liquid Crystals: Physics, Technology, and Applications, (1 February 1998); https://doi.org/10.1117/12.299974

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