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如何通过定向键合设计二十面体准晶
作者:小柯机器人 发布时间:2021/8/21 23:38:58

英国牛津大学Doye, Jonathan P. K.团队开发出通过定向键合设计二十面体准晶的方法。相关研究成果于2021年8月18日发表于国际一流学术期刊《自然》。

二十面体准晶(IQC)是一种具有长程有序性但在任何方向都缺乏周期性的材料。虽然IQC是第一个被报道的准晶,但它们仅在金属合金中被实验观察到,而没有在其他材料中被观察到。相比之下,在一些软物质系统中发现了具有其他对称性(特别是十二面体)的准晶。

该文中,研究人员介绍了一类IQC,它是由模型斑片状胶体构建的,可以通过DNA折纸粒子实验实现。研究人员的合理设计策略导致系统在模拟中通过定向键合稳健地组装成目标IQC。其对于以体心IQC和原始IQC都有说明,最简单的系统只涉及两种粒子类型。关键的设计特征是粒子间相互作用的几何形状有利于二十面体键网络的传播,尽管这会导致许多粒子没有完全键合。

该方法不仅提供模型系统以探索IQC的基本物理,还提供了制备功能准晶材料的潜在途径。

附:英文原文

Title: How to design an icosahedral quasicrystal through directional bonding

Author: Noya, Eva G., Wong, Chak Kui, Llombart, Pablo, Doye, Jonathan P. K.

Issue&Volume: 2021-08-18

Abstract: Icosahedral quasicrystals (IQCs) are materials that exhibit long-range order but lack periodicity in any direction. Although IQCs were the first reported quasicrystals1, they have been experimentally observed only in metallic alloys2, not in other materials. By contrast, quasicrystals with other symmetries (particularly dodecagonal) have now been found in several soft-matter systems3,4,5. Here we introduce a class of IQCs built from model patchy colloids that could be realized experimentally using DNA origami particles. Our rational design strategy leads to systems that robustly assemble in simulations into a target IQC through directional bonding. This is illustrated for both body-centred and primitive IQCs, with the simplest systems involving just two particle types. The key design feature is the geometry of the interparticle interactions favouring the propagation of an icosahedral network of bonds, despite this leading to many particles not being fully bonded. As well as furnishing model systems in which to explore the fundamental physics of IQCs, our approach provides a potential route towards functional quasicrystalline materials.

DOI: 10.1038/s41586-021-03700-2

Source: https://www.nature.com/articles/s41586-021-03700-2

期刊信息

Nature:《自然》,创刊于1869年。隶属于施普林格·自然出版集团,最新IF:42.778
官方网址:http://www.nature.com/