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arXiv 1802.00644cond-mat.soft
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二维流体模型中的三态结构非均匀性

Three-state structural heterogeneity in a model two dimensional fluid

Tamoghna Das, Jack F. Douglas

摘要:

通过分子动力学模拟了在恒定温度和不同密度下的平衡二维Lennard-Jones流体,确定了三种具有不同平均迁移率的结构种群。通过曲面细分来量化粒子的直接邻域的结构,允许我们通过曲面细分单元的形状来识别三种不同的结构状态。不考虑这些群体之间的动态粒子交换,每个观察到保持自己的热力学和平均动力学性质的液体-固体过渡。我们希望这些发现是有价值的,更好地了解在复杂的流体中定义的局部流动性波动的动力学异质性的结构基础。

英文摘要:

Three structural populations with distinct average mobility are identified within an equilibrium two-dimensional Lennard-Jones fluid simulated via molecular dynamics at a constant temperature and varying density. Quantifying the structure of the immediate neighborhood of particles by a tessellation allows us to identify three distinct structural states by the shapes of the tessellation cells. Irrespective of dynamic particle exchange among these populations, each is observed to maintain their own thermodynamic and average dynamic properties across the liquid-solid transition. We expect these findings to be valuable for better understanding the structural basis of dynamical heterogeneity in complex fluids defined in terms of local mobility fluctuations.

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