二元一维胶体的分层自组装六角形蜂窝和kagome超晶格。,Nature Communications

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二元一维胶体的分层自组装六角形蜂窝和kagome超晶格。
Nature Communications ( IF 14.7 ) Pub Date : 2017-08-25 , DOI: 10.1038/s41467-017-00512-9
Sung-Hwan Lim , Taehoon Lee , Younghoon Oh , Theyencheri Narayanan , Bong June Sung , Sung-Min Choi

二元纳米粒子超晶格的合成已引起广泛的潜在应用关注。然而，这对于一维纳米粒子系统仍然具有挑战性。在这项研究中，我们研究了不同直径的一维纳米粒子在六方堆积的圆柱状胶束系统中的填充行为，并证明可以通过调节粒径和混合比来获得两种不同对称性的二元一维纳米粒子超晶格。一维纳米粒子的六边形阵列嵌入在蜂窝晶格（对于AB ₂型）或kagome晶格（对于AB _3中）中类型）的胶束圆柱体。自由体积熵的最大化被认为是超晶格形成的主要驱动力，这在我们的理论自由能计算中得到了很好的支持。我们的方法为制备二元一维纳米粒子超晶格提供了一条途径，并且可能适用于无机一维纳米粒子系统。由于粒子类型分为相态，一维粒子的二元混合物很少能协同自组装成二元超晶格。在这里，作者设计了一种避免相分离的系统，只需调节粒径和混合物组成即可获得具有不同对称性的二元超晶格。

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Hierarchically self-assembled hexagonal honeycomb and kagome superlattices of binary 1D colloids.

Synthesis of binary nanoparticle superlattices has attracted attention for a broad spectrum of potential applications. However, this has remained challenging for one-dimensional nanoparticle systems. In this study, we investigate the packing behavior of one-dimensional nanoparticles of different diameters into a hexagonally packed cylindrical micellar system and demonstrate that binary one-dimensional nanoparticle superlattices of two different symmetries can be obtained by tuning particle diameter and mixing ratios. The hexagonal arrays of one-dimensional nanoparticles are embedded in the honeycomb lattices (for AB₂ type) or kagome lattices (for AB₃ type) of micellar cylinders. The maximization of free volume entropy is considered as the main driving force for the formation of superlattices, which is well supported by our theoretical free energy calculations. Our approach provides a route for fabricating binary one-dimensional nanoparticle superlattices and may be applicable for inorganic one-dimensional nanoparticle systems.Binary mixtures of 1D particles are rarely observed to cooperatively self-assemble into binary superlattices, as the particle types separate into phases. Here, the authors design a system that avoids phase separation, obtaining binary superlattices with different symmetries by simply tuning the particle diameter and mixture composition.

更新日期：2017-08-25

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