Mobility of Ions in the Nematic Phase of 4-n-Octyl-4′-cyanobiphenyl (8CB)

Abstract

The relationship between the mobility of ions and viscosity is discussed for the nematic phase of 4-n-octyl-4′-cyanobiphenyl (8CB). The Miesowicz viscosity coefficient η2 exhibits a divergence at the nematic-smectic phase transition; nevertheless, normal behavior of the temperature dependence is observed for the mobility of ions. Although the Walden rule is not valid for the entire temperature range in the nematic phase, it is presumed that there is no significant difference in the ionic radius between the nematic and isotropic phases.