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Double-twist cylinders in liquid crystalline cholesteric blue phases observed by transmission electron microscopy

机译:透射电子显微镜观察液晶胆甾型蓝相中的双扭转圆柱

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摘要

Cholesteric blue phases are liquid crystalline phases in which the constituent rod-like molecules spontaneously form three-dimensional, helical structures. Despite theoretical predictions that they are composed of cylindrical substructures within which the liquid crystal molecules are doubly twisted, real space observation of the arrangement of such structures had not been performed. Through transmission electron microscopy of photopolymerized blue phases with controlled lattice plane orientations, we report real space observation and comparison of the lattice structures of blue phases I and II. The two systems show distinctly different contrasts, reflecting the theoretically predicted, body centred and simple cubic arrangement of the double-twist cylinders. Transmission electron microscopy also reveals different tendencies of the two blue phases to align on unidirectionally rubbed surfaces. We thus show that TEM observation of alignment-controlled, photopolymerized liquid crystals can be a powerful tool to investigate complex liquid crystalline order.
机译:胆甾醇蓝相是液晶相,其中组成的棒状分子自发形成三维螺旋结构。尽管理论上预测它们是由圆柱形子结构组成的,液晶分子在其中被双重扭曲,但是尚未进行这种结构的布置的实际空间观察。通过具有受控晶格平面取向的光致聚合蓝相的透射电子显微镜,我们报告了真实空间观察和蓝相I和II的晶格结构的比较。这两个系统显示出截然不同的对比,反映了理论上预测的,双扭转气缸的体心定位和简单的立方布置。透射电子显微镜还揭示了两个蓝相在单向摩擦表面上排列的不同趋势。因此,我们表明对取向控制的光致聚合液晶进行TEM观察可以成为研究复杂液晶顺序的有力工具。

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