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Multiple Polar and Non-polar Nematic Phases |
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| Authors: | Stevie Brown Dr. Ewan Cruickshank Prof. John M. D. Storey Prof. Corrie T. Imrie Prof. Damian Pociecha Dr. Magdalena Majewska Dr. Anna Makal Prof. Ewa Gorecka |
| Affiliation: | 1. Department of Chemistry, University of Aberdeen, Old Aberdeen, AB24 3UE U.K.;2. Department of Chemistry, University of Warsaw, Zwirki i Wigury 101, 02-089 Warsaw, Poland |
| Abstract: | Liquid-crystal materials exhibiting up to three nematic phases are reported. Dielectric response measurements show that while the lower temperature nematic phase has ferroelectric order and the highest temperature nematic phase is apolar, the intermediate phase has local antiferroelectric order. The modification of the molecular structure by increasing the number of lateral fluorine substituents leads to one of the materials showing a direct isotropic-ferronematic phase transition. |
| Keywords: | ferroelectric properties nematic phase dielectric constant liquid crystals materials science |