Influence of smectic order on the static dielectric permittivity of liquid crystals

摘要

In somep, pprime;hyphen;dihyphen;nhyphen;alkylhyphen;azoxybenzenes, an anomalous decrease of egr;Verbar;and increase ofegr;perp;is observed when the nematic phase is cooled to below the nematicsol;smectichyphen;A transition temperature. This is attributed to dipolehyphen;dipole interaction, which becomes especially important for neighboring molecules in the same smectic layer. The Kirkwoodhyphen;Frouml;hlich theory for the dielectric properties of anisotropic polar liquids is used in order to account for these interactions.