Binary mixtures of bent-core molecules forming distinct types of B4 phase nano- and microfilament morphologies
Binary mixtures of bent-core molecules forming distinct types of B4 phase nano- and microfilament morphologies
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DOI：
10.1080/02678292.2020.1847333
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发表时间：
2020-11
期刊：
影响因子：
2.2
通讯作者：
Jiao Liu;Sasan Shadpour;Ahlam Nemati;M. Prévôt;E. Hegmann;Chenhui Zhu;T. Hegmann
中科院分区：
文献类型：
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作者：
Jiao Liu;Sasan Shadpour;Ahlam Nemati;M. Prévôt;E. Hegmann;Chenhui Zhu;T. Hegmann
具有弯曲分子形状的某些分子具有形成具有负高斯或圆柱曲率的分层自组装螺旋构建块的显著能力，其特征在于层内六角有序-所谓的B4相-已经迅速将这些分子转化为用于光学、能量收集和超材料中的各种潜在应用的理想构建块。我们在这里证明，这些积木，螺旋纳米丝，螺旋微丝，和螺旋层状纳米圆柱体，可以在一定程度上可预测的混合。通过扫描以及透射电子显微镜和可变角X射线散射数据的支持，三种B4-核心化合物，每一种正好形成这些B4形态中的一种，在1：1摩尔比的二元混合物中，形成第三种缺失，或两种中的一种，但具有相反的手性，或具有较大总体尺寸的两种所选形态的随机混合物。此外，对于两个混合物的先验预测手性细丝的手性实验证实。第三个混合物与先验预测的拮抗性手性的初始形态形成了两个的组合，一个显然是非手性的，另一个具有相反的手性。图形摘要
ABSTRACT The remarkable ability of certain molecules with a bent molecular shape to form hierarchically self-assembled helical building blocks with negative Gaussian or cylindrical curvature featuring in-layer hexatic ordering– so-called B4 phases – has quickly transformed these molecules into desirable building blocks for a variety of potential applications in optics, energy harvesting, and metamaterials. We here demonstrate that these building blocks, helical nanofilaments, helical microfilaments, and heliconical-layered nanocylinders, can to some degree be predictably blended. Supported by scanning as well as transmission electron microscopy and variable angle x-ray scattering data, the three bent-core compounds, each forming exactly one of these B4 morphologies, in binary mixtures at a 1:1 molar ratio, form either the third missing, or one of the two but with opposite handedness, or a random mixture of the two selected morphologies with larger overall dimensions. Furthermore, for two of the mixtures the a priori predicted handedness of the chiral filaments was experimentally confirmed. The third mixture with a priori predicted antagonistic handedness of the initial morphologies forms a combination of the two, one apparently achiral and the other one with opposite handedness. GRAPHICAL ABSTRACT