Dielectric measurements of liquid crystals

Abstract

A new measurement cell for very small quantities of liquid crystals is used for the determination of the complex permittivity of the cyanobenzylidene p' octyloxyaniline (CBOOA). The dielectric behaviour in the nematic and smectic-A phase is given as a function of an applied electric field (static and alternative) as well as of a magnetic one within a large frequency and temperature range Utilisation d'une nouvelle cellule pour les mesures dielectriques sur de faibles quantites de cristal liquide. Application a la cyanobenzylidene octyloxyaniline: permittivite complexe en champ electrique continu ou alternatif, sous champ magnetique, dans un grand intervalle de frequences et de temperatures en phase nematique et smectique