Classical nucleation theory predicts the shape of the nucleus in homogeneous solidification.

Classical nucleation theory predicts the shape of the nucleus in homogeneous solidification.
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经典成核理论预测均匀凝固中核的形状。

DOI:
10.1063/1.5134461
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发表时间:
2020
期刊:
The Journal of chemical physics
影响因子:
--
通讯作者:
Cheng B
Cheng B
中科院分区:
--
文献类型:
--
作者:
Cheng B

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成核的宏观模型为理解活化相变过程提供了强有力的工具。这些模型不提供原子论的见解,因此有时可能缺乏特定材料的描述。在这里,我们提供了一个全面的框架,从原子模拟均匀成核构造一个连续图像。我们使用这个框架来确定固体核的平衡形状,形成内散装液体的Lennard-Jones潜力。从这个形状,我们然后提取的各向异性的固液界面自由能,通过执行一个反向武尔夫建设在空间的球谐展开。我们发现,核的形状是近球形的,它的各向异性可以完美地描述使用经典模型。由AIP Publishing授权出版。
Macroscopic models of nucleation provide powerful tools for understanding activated phase transition processes. These models do not provide atomistic insights and can thus sometimes lack material-specific descriptions. Here, we provide a comprehensive framework for constructing a continuum picture from an atomistic simulation of homogeneous nucleation. We use this framework to determine the equilibrium shape of the solid nucleus that forms inside bulk liquid for a Lennard-Jones potential. From this shape, we then extract the anisotropy of the solid-liquid interfacial free energy, by performing a reverse Wulff construction in the space of spherical harmonic expansions. We find that the shape of the nucleus is nearly spherical and that its anisotropy can be perfectly described using classical models. Published under license by AIP Publishing.
从平滑波动的分界面中提取界面自由能和各向异性
DOI: --
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影响因子: --
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