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Nanoparticle Superlattices as Quasi-Frank-Kasper Phases
Physical Review Letters ( IF 8.6 ) Pub Date : 2017-09-14 00:00:00 , DOI: 10.1103/physrevlett.119.115701
Alex Travesset

I show that all phases reported experimentally in binary nanoparticle superlattices can be described as networks of disclinations in an ideal lattice of regular tetrahedra. A set of simple rules is provided to identify the different disclination types from the Voronoi construction, and it is shown that those disclinations completely screen the positive curvature of the ideal tetrahedral lattice. In this way, this study provides a generalization of the well-known Frank-Kasper phases to binary systems consisting of two types of particles, and with a more general type of disclinations, i.e., quasi-Frank-Kasper phases. The study comprises all strategies in nanoparticle self-assembly, whether driven by DNA or hydrocarbon ligands, and establishes the universal tendency of superlattices to develop icosahedral order, which is facilitated by the asymmetry of the particles. Besides its interest in predicting nanoparticle self-assembly, I discuss the implications for models of the glass transition, micelles of diblock polymers, and dendritic molecules, among many others.

中文翻译:

纳米超晶格作为准弗兰克·卡斯珀相

我表明,在二元纳米颗粒超晶格中实验报告的所有相都可以描述为规则四面体理想晶格中的错位网络。提供了一组简单的规则来识别Voronoi构造中不同的错位类型,并且表明这些错位完全屏蔽了理想四面体晶格的正曲率。通过这种方式,本研究将众所周知的Frank-Kasper相概括为由两种类型的粒子组成的二元系统,并具有更一般的向错类型,即准Frank-Kasper相。这项研究涵盖了由DNA或碳氢化合物配体驱动的纳米粒子自组装的所有策略,并建立了超晶格发展二十面体顺序的普遍趋势,颗粒的不对称性促进了这一点。除了对预测纳米粒子自组装的兴趣外,我还讨论了玻璃化转变模型,二嵌段聚合物的胶束和树枝状分子的含义。
更新日期:2017-09-14
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