Lyotropic liquid crystalline hexagonal mesophase. Thermo-morphologic and magneto-morphologic transformations, electrical conductivity and optical refractive properties: Effect of optically active compounds

Abstract

Mesophase chirality in lyotropic liquid crystalline hexagonal E mesophase, which is formed by the anisometric micelles with quasi-infinite length, was studied. Effect of the optically active dopants {tartaric acid (TA) and wine acid (WA)} on the thermo-morphologic, magneto-morphologic, electrical conductivity and optical refractive properties of E mesophase has been investigated. Chiral structures of E mesophase with the spaghetti-like texture have been found in the quaternary amphiphile+water+aliphatic alcol+chiral dopant lyotropic systems and the pitch of such structures vs. concentration of optically active dopants has been estimated. Texture transformations vs. temperatures and external magnetic fields for mixtures with various concentrations of the optically active dopants have been studied. Effect of TA and WA dopants on texture types, specific electrical conductivity and refractive index is analyzed and discussed. (C) 2019 Elsevier B.V. All rights reserved.