Gm. Tsangaris, CORRELATION FACTORS IN THE NEMATIC AND ISOTROPIC-PHASE OF 4-N-OCTYL-4-CYANOBIPHENYL (8CB), Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals, 237, 1993, pp. 163-173
Dielectric permittivity of 4-n-octyl-4-cyanobiphenyl (8CB) is measured
by a shearing Couette cell in the nematic and isotropic phase. Correl
ation factors are calculated according to Bordewijk and De Jeu for the
nematic mesophases and according to Kirkwood for the isotropic liquid
. Activation energy for the nematic reordering is measured dielectrica
lly and the viscous activation energy is measured through the viscomet
ric capability of the shearing cell. A potential barrier of 0.18 eV du
e to close range intermolecular forces is then obtained.