Depletion-driven crystallization of cubic colloids sedimented on a surface.
Depletion-driven crystallization of cubic colloids sedimented on a surface.
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DOI：
10.1063/1.4949758
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发表时间：
2016-05-21
期刊：
影响因子：
--
通讯作者：
Shen VK
中科院分区：
文献类型：
--
作者：
Hatch HW;Krekelberg WP;Hudson SD;Shen VK
立方体胶体，沉积在表面上，并沉浸在溶液中的耗尽分子，建模与家庭的形状，顺利地从正方形到圆形。使用Wang-Landau模拟与扩展的合奏，我们观察到的菱形晶格，正方形晶格，六边形晶格和流体相的形成。这个系统的调查包括定位的三种晶格结构的所有组合之间的过渡时，改变形状，和流体和晶体之间的过渡时，改变耗尽剂浓度。菱形晶格在正方形和六边形之间平滑地变形，这取决于形状和耗尽剂浓度。我们的研究结果的效果的expletant浓度，expletant的大小，和胶体形状的影响的稳定性的流体和晶格结构可能有助于指导实验研究与最近合成的立方胶体。
Cubic colloids, sedimented on a surface and immersed in a solution of depletant molecules, were modeled with a family of shapes which smoothly varies from squares to circles. Using Wang-Landau simulations with expanded ensembles, we observe the formation of rhombic lattices, square lattices, hexagonal lattices and a fluid phase. This systematic investigation includes locating transitions between all combinations of the three lattice structures upon changing the shape, and transitions between the fluid and crystal upon changing the depletant concentration. The rhombic lattice deforms smoothly between square-like and hexagonal-like angles, depending on both the shape and the depletant concentration. Our results on the effect of the depletant concentration, depletant size, and colloid shape to influence the stability of the fluid and the lattice structures may help guide experimental studies with recently synthesized cubic colloids.