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arXiv 1901.00780cond-mat.soft
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非手性分子形成的液晶中的多级手性

Multi-level Chirality in Liquid Crystals Formed by Achiral Molecules

Mirosław Salamończyk, Nataša Vaupotič, Damian Pociecha, Rebecca Walker, John M. D. Storey, Corrie T. Imrie, Cheng Wang, Chenhui Zhu, Ewa Gorecka

摘要:

在许多具有层次结构的生物材料中,有一种有趣而独特的机制负责从分子到纳米或微米尺度水平的有序“传播”。在这里,我们提出了一个简单得多的分子系统建立的非手性介晶二聚体分子,表现出类似的复杂性与四个层次的结构手性(i)层手性,(ii)螺旋的基本4层重复单元,(iii)螺旋与几层的间距和(iv)介观螺旋长丝。正如在许多生物系统中所看到的那样,在不同水平的手性之间存在耦合。硬和软X射线衍射测量,光学研究和理论建模相结合的结构进行了鉴定。

英文摘要:

In many biological materials with a hierarchical structure there is an intriguing and unique mechanism responsible for the 'propagation' of order from the molecular to the nano- or micro-scale level. Here we present a much simpler molecular system built of achiral mesogenic dimeric molecules that shows a similar complexity with four levels of structural chirality (i) layer chirality, (ii) helicity of a basic 4-layer repeating unit, (iii) a helix with a pitch of several layers and (iv) mesoscopic helical filaments. As seen in many biological systems, there is a coupling between chirality at different levels. The structures were identified by a combination of hard and soft x-ray diffraction measurements, optical studies and theoretical modelling.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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