Two-dimensional freezing criteria for crystallizing colloidal monolayers.
Two-dimensional freezing criteria for crystallizing colloidal monolayers.
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DOI：
10.1063/1.3372618
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发表时间：
2010-04
期刊：
影响因子：
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通讯作者：
Ziren Wang;A. Alsayed;A. Yodh;Yilong Han
中科院分区：
文献类型：
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作者：
Ziren Wang;A. Alsayed;A. Yodh;Yilong Han
Video microscopy was employed to explore crystallization of colloidal monolayers composed of diameter-tunable microgel spheres. Two-dimensional (2D) colloidal liquids were frozen homogenously into polycrystalline solids, and four 2D criteria for freezing were experimentally tested in thermal systems for the first time: the Hansen-Verlet freezing rule, the Lowen-Palberg-Simon dynamical freezing criterion, and two other rules based, respectively, on the split shoulder of the radial distribution function and on the distribution of the shape factor of Voronoi polygons. Importantly, these freezing criteria, usually applied in the context of single crystals, were demonstrated to apply to the formation of polycrystalline solids. At the freezing point, we also observed a peak in the fluctuations of the orientational order parameter and a percolation transition associated with caged particles. Speculation about these percolated clusters of caged particles casts light on solidification mechanisms and dynamic heterogeneity in freezing.
