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arXiv 2104.07375cond-mat.mtrl-sci
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界面偶极子对非均匀冰成核的影响

Effect of Interfacial Dipole on Heterogeneous Ice Nucleation

Hao Lu, Quanming Xu, Jianyang Wu, Rongdun Hong, Zhisen Zhang

摘要:

在这封信中,我们进行了分子动力学模拟的冰成核的刚性表面模型的立方锌晶体结构与不同的表面偶极子强度和取向。由此可见,尽管立方冰与基质之间具有良好的晶格匹配,但只有当界面水分子与立方冰中的水分子具有相同或相似的取向时,才会发生冰核化。自由能景观显示,对于基板与不适当的偶极子强度/方向,大的自由能障碍出现,以防止IWS的偶极子旋转到正确的方向,以触发冰的形成。我们的研究结果表明,晶格匹配的传统概念,晶格长度之间的相似性的基板和新形成的晶体,应扩展到更广泛的匹配,包括分子取向之间的相似性的界面组件和组件在特定的新形成的晶体面。

英文摘要:

In this letter, we performed molecular dynamics simulations of ice nucleation on a rigid surface model of cubic zinc blende structure with different surface dipole strength and orientation. It follows that, despite the excellent lattice match between cubic ice and substrates, the ice nucleation happened only when the interfacial water molecules (IWs) have the same or similar orientations as that of the water molecules in cubic ice. The free energy landscapes revealed that, for substrates with improper dipole strength/orientation, large free energy barriers arose to prevent the dipole of IWs rotating to the right orientation to trigger ice formation. Our results suggest that the traditional concept of lattice match, the similarity of lattice length between a substrate and the new-formed crystalline, should be extended to a broader match include the similarity between the molecular orientations of the interfacial component and the component in the specific new-formed crystalline face.

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