Chirality Transfer from Molecular to Morphological Scales in Quasi-One-Dimensional Nanomaterials: A Continuum Model
Chirality Transfer from Molecular to Morphological Scales in Quasi-One-Dimensional Nanomaterials: A Continuum Model
复制标题
准一维纳米材料中从分子尺度到形态尺度的手性转移：连续体模型
DOI：
10.1166/jctn.2011.1811
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发表时间：
2011-07-01
影响因子：
--
通讯作者：
Yu, Shou-Wen
中科院分区：
文献类型：
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作者：
Wang, Jian-Shan;Feng, Xi-Qiao;Yu, Shou-Wen
手性的结构层次在多种生物和合成材料中都可以观察到，并且与一些不寻常的物理性质有关。手性在不同长度尺度之间的转移是一个重要的理论和技术问题。本文建立了一个连续统模型，从现象学上合理化了准一维纳米材料从组成分子到几何形态的手性转移。我们证明了低水平手性和表面效应之间的竞争或合作相互作用可能导致各种不对称几何形状的形成。根据材料的手性和各向异性表面应力，推导了准一维材料的手性形态的旋手性和节长。并对实验中观察到的形态手性反转现象进行了解释。该研究结果不仅有助于理解与手性相关的各种有趣现象，而且有助于优化设计和制造具有增强性能和功能的新型材料和器件。
Structural hierarchy of chirality is observable in a diversity of biological and synthetic materials and related to some unusual physical properties. The transfer of chirality among different length scales is a crucial issue of both theoretical and technological interest. In this paper, a continuum model is developed to phenomenologically rationalize the chirality transfer from the constituent molecules to geometric morphology of quasi-one-dimensional nanomaterials. We demonstrate that the competition or cooperative interactions between lower-level chirality and surface effects may lead to the formation of various asymmetric geometric shapes. The twisting handedness and pitch length of chiral morphologies of quasi-one-dimensional materials is derived in terms of materials chirality and anisotropic surface stresses. The inversion of morphological chirality observed in experiments is also explained in this paper. The results of the study is useful not only for understanding various interesting phenomena associated with chirality but also for optimal design and fabrication of novel materials and devices with enhanced properties and functions.