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首页> 外文期刊>The Journal of Chemical Physics >Periodic layers of a dodecagonal quasicrystal and a floating hexagonal crystal in sedimentation-diffusion equilibria of colloids
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Periodic layers of a dodecagonal quasicrystal and a floating hexagonal crystal in sedimentation-diffusion equilibria of colloids

机译：十二段式外晶的周期层和胶体沉降扩散均匀浮动六边形晶体

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摘要

We investigate the behaviour of a system of colloidal particles interacting with a hard-core and a repulsive square shoulder potential under the influence of a gravitational field using event-driven Brownian dynamics simulations. We use a fixed square shoulder diameter equal to 1.4 times the hardcore diameter of the colloids, for which we have previously calculated the equilibrium phase diagram considering two-dimensional disks [H. Pattabhiraman et al., J. Chem. Phys. 143, 164905 (2015) and H. Pattabhiraman and M. Dijkstra, J. Phys.: Condens. Matter 20, 094003 (2017)]. The parameters in the simulations are chosen such that the pressure at the bottom of the sediment facilitates the formation of phases in accordance with the calculated phase diagram of the two-dimensional system. It is surprising that we observe the formation of layers with dodecagonal, square, and hexagonal symmetries at the relevant pressures in the three-dimensional sedimentation column. In addition, we also observe a re-entrant behaviour exhibited by the colloidal fluid phase, engulfing a hexagonal crystal phase, in the sedimentation column. In other words, a floating crystal is formed between the colloidal fluid regions. Published by AIP Publishing.
机译：我们研究了在使用事件驱动的布朗动力学模拟的引力场的影响下与硬芯相互作用的胶体颗粒系统的行为和重力场的影响。我们使用固定的方形肩直径等于胶体的硬核直径的1.4倍，我们先前已经计算了考虑二维磁盘的平衡相图[H. Pattabhiraman等，J.Chem。物理。 143,164905（2015）和H.Pattabhiraman和M. dijkstra，J. Phys.: Concens。物质20,094003（2017）]。选择模拟中的参数，使得沉积物底部的压力有助于根据二维系统的计算的相图进行相位的形成。令人惊讶的是，在三维沉淀柱中的相关压力下，观察层的形成与十二角形，方形和六边形对称。此外，我们还观察到胶体流体相，搅拌六边形晶相的再参赛者行为，沉降柱。换句话说，在胶体流体区域之间形成浮晶。通过AIP发布发布。

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