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Dielectric Relaxation and Viscosity of Mesogenic n-Heptylcyanobiphenyl

Ginovska M., Czechowski G., Andonovski A., Jadżyn J.

Polish Journal of Chemistry

2001

Vol. 75, nr 10

1505-1511

Molecular dynamics of n-heptylcyanobiphenyl (C7H15-Ph-Ph-C=N, 7CB) in the isotropic and nematic phases was studied with the use of dielectric spectroscopy. In the measuring frequency range (from 100 kHz to 100 MHz) the absorption band corresponding to the molecular rotation around the short axis dominates in the dielectric spectrum. On the basis of temperature dependences of the relaxation time and the shear viscosity of 7CB, the strength of the nematic potential and the effective length of the rotating 7CB molecule were estimated.