论文标题
扭曲弯曲列表：一个错误的身份案例
The Twist Bend Nematic: A Case of Mistaken Identity
论文作者
论文摘要
我们回顾了迈耶（Meyer）在nematics的弗兰克·森（Frank-Oseen）弹性理论中如何共同构思迈耶（Mayer）如何建立宏观尺度的扭曲和弯曲的猜想，以创建单轴，一次性nematory导演的灵活安排，即所谓的“扭曲弯曲弯曲nematic nematic nematic nematic nematic” $ \ rm n_ n_ n_ {tb} $。我们表明，自2011年以来，在Toriumi发现并称为$ \ rm n_x $的奇数甲基链苯基二聚体中观察到的第二个，温度较低的列中相，已被错误地识别为$ \ rm n_ {tb} $。此外，随着出现了$ \ rm n_x $的更多定量数据，迈耶的简单预测已被扭曲以适应这些发现。实际上，$ \ rm n_x $中的分子组织符合$ \ rm n_ {pt} $相位，这是2016年提出的非线性中质量的极性，扭曲的非线性中的排列。$ \ rm n_ {pt} $的属性从$ n_ {pt} $中得到了总结和区分。 $ \ rm n_x $相位，同样重要的是，要鼓励研究人员继续寻找表现出Meyer开创性的理论建议的液晶，即，由Achiral Molecules组成的简单神秘物质可以存在。
We review the physics underlying Meyer's conjecture of how macroscopic-scale twist and bend conspire within the Frank-Oseen elasticity theory of nematics to create a heliconical arrangement of the uniaxial, apolar nematic director, the so-called "twist bend nematic" $\rm N_{TB}$. We show that since 2011 a second, lower-temperature nematic phase observed in odd methylene-linked cyanobiphenyl dimers discovered by Toriumi and called $\rm N_X$, has been incorrectly identified as $\rm N_{TB}$. Moreover, as more quantitative data on the $\rm N_X$ emerged, Meyer's simple prediction has been distorted to accommodate those findings. In fact, the molecular organization in the $\rm N_X$ conforms to the $\rm N_{PT}$ phase, a polar, twisted arrangement of nonlinear mesogens advanced in 2016. The attributes of the $\rm N_{PT}$ are summarized and differentiated from those of the $\rm N_{TB}$ in an effort to contribute to a better understanding of the $\rm N_X$ phase and, equally important, to encourage researchers to continue to search for a liquid crystal that exhibits Meyer's pioneering theoretical suggestion, namely that form-chirality can exist in simple nematics composed of achiral molecules.
