期刊
LIQUID CRYSTALS
卷 43, 期 13-15, 页码 2254-2276出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/02678292.2016.1204634
关键词
Biaxial nematic; bent-core mesogens; cybotactic nematic; X-ray diffraction
Since its theoretical prediction in 1970, the search for the biaxial nematic phase in thermotropic systems has challenged generations of liquid crystal scientists. Over the last 10years, bent-core mesogens have drawn much interest as promising candidates for nematic biaxiality. However, despite a number of disputed claims, conclusive evidence of proper (spontaneous and macroscopic) biaxial order in these materials is still missing. By contrast, it is now widely recognised that biaxiality exists on a local scale, in the form of nano-sized clusters of molecules (cybotactic groups) possessing smectic-like positional order and biaxial orientational order. This article provides a review of X-ray diffraction studies on biaxiality and cybotaxis in bent-core nematics, discussing the most relevant issues related to this research field. [GRAPHICS] .
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