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arXiv 1201.3259cond-mat.soft
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片状胶体颗粒的自组装研究

Self-assembly scenarios of patchy colloidal particles

G. Doppelbauer, E. G. Noya, E. Bianchi, G. Kahl

摘要:

精确设计片状胶体颗粒表面装饰的快速进展为在软物质系统中为更大、更复杂的结构创建建筑实体提供了一种新的、但没有经验的自由。然而,要预测这些粒子在外部参数(如温度或压力)变化下能够经历的各种有序平衡结构是非常困难的。本文证明了,通过两种新的理论工具的结合,确实有可能预测片状胶体粒子的自组装:一方面,基于进化算法思想的可靠而有效的优化工具有助于识别T = 0时期望的有序平衡结构;另一方面,合适的模拟技术允许通过自由能计算来估计有限温度下的相图。有了这些强大的方法,我们能够识别各种各样的新兴的自组装方案的球形胶体装饰四补丁,我们调查和讨论的稳定性的晶体结构上修改在一个可控的方式四面体排列的补丁。

英文摘要:

The rapid progress in precisely designing the surface decoration of patchy colloidal particles offers a new, yet unexperienced freedom to create building entities for larger, more complex structures in soft matter systems. However, it is extremely difficult to predict the large variety of ordered equilibrium structures that these particles are able to undergo under the variation of external parameters, such as temperature or pressure. Here we show that, by a novel combination of two theoretical tools, it is indeed possible to predict the self-assembly scenario of patchy colloidal particles: on one hand, a reliable and efficient optimization tool based on ideas of evolutionary algorithms helps to identify the ordered equilibrium structures to be expected at T = 0; on the other hand, suitable simulation techniques allow to estimate via free energy calculations the phase diagram at finite temperature. With these powerful approaches we are able to identify the broad variety of emerging self-assembly scenarios for spherical colloids decorated by four patches and we investigate and discuss the stability of the crystal structures on modifying in a controlled way the tetrahedral arrangement of the patches.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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