Open AccessAn Optically Isotropic Antiferroelectric Liquid Crystal (OI‐AFLC) Display Mode Operating over a Wide Temperature Range using Ternary Bent‐Core Liquid Crystal Mixtures
Author(s) -
Bergquist Leah,
Zhang Cuiyu,
Ribeiro de Almeida Roberta R.,
Pellegrene Brittany,
Salamonczyk Miroslaw,
Kim Matthew,
Hwang JungIm,
Kim KyeongJin,
Lee JounHo,
Jákli Antal,
Hegmann Torsten
Publication year - 2017
Publication title -
chemistryopen
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 29
ISSN - 2191-1363
DOI - 10.1002/open.201600138
Subject(s) - liquid crystal , materials science , ternary operation , antiferroelectricity , differential scanning calorimetry , thermotropic crystal , optics , atmospheric temperature range , analytical chemistry (journal) , crystallography , dielectric , chemistry , optoelectronics , ferroelectricity , organic chemistry , thermodynamics , liquid crystalline , physics , computer science , programming language
We report on the synthesis and characterization of bent‐core liquid crystal (LC) compounds and the preparation of mixtures that provide an optically isotropic antiferroelectric (OI‐AFLC) liquid crystal display mode over a very wide temperature interval and well below room temperature. From the collection of compounds synthesized during this study, we recognized that several ternary mixtures displayed a modulated SmC a P A phase down to below −40 °C and up to about 100 °C on both heating and cooling, as well as optical tilt angles in the transformed state of approximately 45° (optically isotropic state). The materials were fully characterized and their liquid crystal as well as electro‐optical properties analyzed by polarized optical microscopy, differential scanning calorimetry, synchrotron X‐ray diffraction, dielectric spectroscopy, and electro‐optical tests.