An effect of chiral dopants on mesomorphic and electro-optical properties of ferroelectric smectic mixture. Issue 15 (8th December 2019)

• Record Type: Journal Article
• Authors: Gaładyk, Katarzyna; Piecek, Wiktor; Czerwiński, Michał; Morawiak, Przemysław; Chrunik, Maciej; Raszewski, Zbigniew
• Is Part Of: Liquid crystals. Volume 46:Issue 15(2019)
• Page Start: 2134
• Page End: 2148
• Publication Date: 2019-12-08
• Subjects: Induced chirality -- pyrimidine-based smectic -- surface stabilised ferroelectric liquid crystal (SSFLC) -- spontaneous polarisation - tilt coupling -- SmC*-SmA* phase transition; Liquid crystals -- Periodicals; 548.905
• DOI: 10.1080/02678292.2019.1613689
• Languages: English
• ISSNs: 0267-8292

Abstract

ABSTRACT: The aim of the presented research was an assessment of an effect of chiral dopants on the physical and electro-optical properties of a ferroelectric smectic mixture which is a key factor of elaboration of working ferroelectric liquid crystal (FLC) mixtures of tailored properties, especially with the tilt angle θ value near 22.5° in a broad temperature range. Testing FLC mixtures were prepared using the common pyrimidine-based parent mixture F4 doped with three different chiral dopants. The thermal characteristic of the optical tilt angle θ O P T, tilt angle calculated by means of X-ray diffraction method θ X R D, spontaneous polarisation P s and layer spacing d of obtained FLC mixtures were studied. Based on the above measurements and computer calculations, the relationship between spontaneous polarisation P s and tilt angle θ O P T was discussed. Electro-optical performance of the Surface Stabilised Ferroelectric Liquid Crystal (SSFLC) structures was observed. The relation between the molecular properties of chiral dopants and the electro-optical and physical properties of obtained FLC mixtures is considered in frames of the extended microscopic model of the spontaneous polarisation in FLCs. Graphical abstract: