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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Chiral symmetry breaking by spatial confinement in tactoidal droplets of lyotropic chromonic liquid crystals
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Chiral symmetry breaking by spatial confinement in tactoidal droplets of lyotropic chromonic liquid crystals

机译：溶致发色液晶的触觉液滴中的空间限制打破了手性对称性

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摘要

In many colloidal systems, an orientationally ordered nematic (N) phase emerges from the isotropic (I) melt in the form of spindle-like birefringent tactoids. In cases studied so far, the tactoids always reveal a mirror-symmetric nonchiral structure, sometimes even when the building units are chiral. We report on chiral symmetry breaking in the nematic tactoids formed in molecularly nonchiral polymer-crowded aqueous solutions of low-molecular weight disodium cromoglycate. The parity is broken by twisted packing of self-assembled molecular aggregates within the tactoids as manifested by the observed optical activity. Fluorescent confocal microscopy reveals that the chiral N tactoids are located at the boundaries of cells. We explain the chirality induction as a replacement of energetically costly splay packing of the aggregates within the curved bipolar tactoidal shape with twisted packing. The effect represents a simple pathway of macroscopic chirality induction in an organic system with no molecular chirality, as the only requirements are orientational order and curved shape of confinement.
机译：在许多胶体系统中，各向同性（I）熔体以纺锤状双折射触针形式出现取向有序的向列相（N）。在到目前为止的案例研究中，触角始终显示出镜面对称的非手性结构，有时即使建筑单元是手性的。我们报告了在低分子量色甘酸二钠分子非手性聚合物拥挤的水溶液中形成的向列型触觉中的手性对称性断裂。如所观察到的光学活性所表明的那样，奇偶校验被扭曲的自组装分子聚集体堆积在触针内而破裂。荧光共聚焦显微镜显示手性N触针位于细胞边界。我们将手性诱导解释为在弯曲的双极触觉形状内以扭曲的填料代替了能量上昂贵的八角填料。该作用代表了在没有分子手性的有机系统中宏观手性诱导的简单途径，因为唯一的要求是取向顺序和约束的弯曲形状。

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