Gleeson Helen F, Kaur Sarabjot, Görtz Verena, Belaissaoui Abdel, Cowling Stephen, Goodby John W
School of Physics and Astronomy, The University of Manchester, Oxford Road, Manchester, M13 9PL (UK).
Chemphyschem. 2014 May 19;15(7):1251-60. doi: 10.1002/cphc.201400014. Epub 2014 Apr 2.
Over the last ten years, the nematic phases of liquid crystals formed from bent-core structures have provoked considerable research because of their remarkable properties. This Minireview summarises some recent measurements of the physical properties of these systems, as well as describing some new data. We concentrate on oxadiazole-based materials as exemplars of this class of nematogens, but also describe some other bent-core systems. The influence of molecular structure on the stability of the nematic phase is described, together with progress in reducing the nematic transition temperatures by modifications to the molecular structure. The physical properties of bent-core nematic materials have proven difficult to study, but patterns are emerging regarding their optical and dielectric properties. Recent breakthroughs in understanding the elastic and flexoelectric behaviour are summarised. Finally, some exemplars of unusual electric field behaviour are described.
在过去十年中，由弯曲核结构形成的液晶向列相因其卓越的性能引发了大量研究。本综述总结了这类体系物理性质的一些最新测量结果，并描述了一些新数据。我们重点关注基于恶二唑的材料，将其作为这类向列型液晶的典型示例，但也描述了一些其他弯曲核体系。文中阐述了分子结构对向列相稳定性的影响，以及通过分子结构修饰降低向列相转变温度方面取得的进展。弯曲核向列相材料的物理性质已证明难以研究，但关于其光学和介电性质的规律正在显现。文中总结了在理解弹性和挠曲电行为方面的近期突破。最后，描述了一些异常电场行为的示例。
