Detailed study of a two component smectic 4TPB–8OCB system with a nematic gap. Phase diagram and viscosity study

1 January 1993

journal article
research article
Published by Taylor & Francis in Liquid Crystals

Vol. 14 (5) , 1371-1375
https://doi.org/10.1080/02678299308026449

Abstract

The phase diagram of a two component system composed of two smectic compounds: 4-octyloxy-4′-cyanobiphenyl (8OCB) and 4-isothiocyanatophenyl 4-butylbenzoate (4TPB) was investigated. Three Miesowicz viscosity coefficients η₁, η₂, η₃ and the refractive indices at different temperatures as well as the enthalpies of the phase transitions were measured. It was stated, that the properties of the induced nematic phase, for example, the nematic phase existing between two smectic regions, are the same as the ones observed in the case of low viscosity nematic mesogens.

Keywords

This publication has 8 references indexed in Scilit:

Creation of nematic and reentrant nematic phases in bi- and multi-component smectic mixtures
Liquid Crystals, 1993
Improved Miesowicz Viscometer
Molecular Crystals and Liquid Crystals Incorporating Nonlinear Optics, 1990
Phase Diagrams of Mixtures Consisting of Polar Compounds S_E and S_A_d
Molecular Crystals and Liquid Crystals Incorporating Nonlinear Optics, 1990
A nematic phase created in mixtures of polar smectics The effect of smectic layer properties
Liquid Crystals, 1989
A Nematic Gap in Binary Mixtures of Compounds without a Strong Polar Group
Molecular Crystals and Liquid Crystals Incorporating Nonlinear Optics, 1987
A Mixture-Induced Nematic Phase
Molecular Crystals and Liquid Crystals, 1986
Binary systems of smectics A with enhanced nematic phase
Journal de Physique, 1984
Direct Determination of the Five Independent Viscosity Coefficients of Nematic Liquid Crystals
Molecular Crystals and Liquid Crystals, 1973