Chemically induced splay nematic phase with micron scale periodicity.,Soft Matter

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Chemically induced splay nematic phase with micron scale periodicity.
Soft Matter ( IF 2.9 ) Pub Date : 2020-01-02 , DOI: 10.1039/c9sm02143d
Perri L M Connor ₁ , Richard J Mandle

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Nematic liquid crystals lack positional order of their constituent molecules, which share an average orientational order only. Modulated nematic liquid crystal phases also lack positional order, but possess a periodic variation in this direction of average orientation. In the recently discovered splay nematic (NS) phase the average orientational order is augmented with a periodic splay deformation of orientation perpendicular to the director. In this communication we report the first example of a splay nematic phase which is chemically induced by mixing two materials, neither of which exhibit the NS phase. The splay-nematic phase is identified based on its optical textures, X-ray scattering patterns, and small enthalpy of the associated phase transition. We measure the splay periodicity optically, finding it to be ∼9 μm. This unexpected generation of the splay-nematic phase through binary mixtures offers a new route to materials which exhibit this phase which complements ongoing studies into structure-property relationships and could accelerate the development of technologies utilising this remarkable polar nematic variant.

中文翻译：

化学诱导的向列相向列相，具有微米级的周期性。

向列型液晶缺乏其组成分子的位置顺序，该位置分子仅共享平均的取向顺序。调制的向列液晶相也缺乏位置顺序，但是在平均取向的该方向上具有周期性变化。在最近发现的向列向列（NS）阶段中，平均定向顺序随着垂直于指向矢的方向的周期性向外扩展而增加。在本交流中，我们报告了向斜向列相的第一个例子，该向列相是通过将两种材料混合而化学诱导的，而两种材料均未显示出NS相。根据其光学纹理，X射线散射图样和相关相变的小焓来确定八字向列相。我们用光学方法测量张开周期，发现它约为9μm。

更新日期：2020-01-02

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