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arXiv 1401.4475cond-mat.softcond-mat.mtrl-scinlin.PS
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周期和非周期团簇晶体的可控自组装

Controlled self-assembly of periodic and aperiodic cluster crystals

Kobi Barkan, Michael Engel, Ron Lifshitz

摘要:

已知软颗粒重叠并形成稳定的簇,其自组装成具有密度无关的晶格常数的周期性晶相。我们使用分子动力学模拟在两个维度上证明,通过一个明智的设计的各向同性对潜力,可以控制的集群的顺序,并产生各种相,包括十次和十二次准晶。我们的研究结果证实了分析预测的基础上的平均场近似,提供洞察准晶体在软大分子系统的稳定,并提出了一个实用的方法,其控制自组装在实验室实现使用合成的软物质粒子。

英文摘要:

Soft particles are known to overlap and form stable clusters that self-assemble into periodic crystalline phases with density-independent lattice constants. We use molecular dynamics simulations in two dimensions to demonstrate that, through a judicious design of an isotropic pair potential, one can control the ordering of the clusters and generate a variety of phases, including decagonal and dodecagonal quasicrystals. Our results confirm analytical predictions based on a mean-field approximation, providing insight into the stabilization of quasicrystals in soft macromolecular systems, and suggesting a practical approach for their controlled self-assembly in laboratory realizations using synthesized soft-matter particles.

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