A new thermotropic reentrant behaviour in a chiral liquid crystal dimer: the occurrence of SmA–SmAb–SmA phase sequence

Abstract

A nonsymmetric liquid crystal dimer formed by covalently linking cyanobiphenyl and chiral salicyladimine mesogens through a heptamethylene spacer exhibits a new reentrant phase sequence, uniaxial smectic A–biaxial smectic A–uniaxial smectic A phase, below the blue phase–chiral nematic–twist grain boundary phases.