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arXiv 2202.05883cond-mat.softcond-mat.stat-mech
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液态水表面的局部冰状结构

Local ice-like structure at the liquid water surface

Nathan L. Odendahl, Phillip L. Geissler

摘要:

实验和计算机模拟已经证实,液态水的表面可能会以重要的方式偏离常见的整体行为。即使在最简单的情况下,空气-水界面,独特的分层,取向偏差,和氢键的安排已被报道,但其起源和关系的总体图片一直是不完整的。在这里,我们表明,一个广泛的一组这样的观察可以理解,通过类比与结晶冰的基面。使用模拟,我们特别表明,水和冰的表面共享一组结构特征,这表明在空气-水界面处存在纳米级的冰状域。最突出的是分子密度和垂直于界面的取向的共享特征分层。氢键网络几何结构的两点相关性的相似点共享冰状分子间结构的平行方向以及。我们的研究结果支持并显着扩展了以前的概念,冰状结构在液体的边界,并建议,备受讨论的准液体层冰演变成一个准冰层在液态水的表面上的熔点以上微妙。

英文摘要:

Experiments and computer simulations have established that liquid water's surfaces can deviate in important ways from familiar bulk behavior. Even in the simplest case of an air-water interface, distinctive layering, orientational biases, and hydrogen bond arrangements have been reported, but an overarching picture of their origins and relationships has been incomplete. Here we show that a broad set of such observations can be understood through an analogy with the basal face of crystalline ice. Using simulations, we specifically demonstrate that water and ice surfaces share a set of structural features suggesting the presence of nanometer-scale ice-like domains at the air-water interface. Most prominent is a shared characteristic layering of molecular density and orientation perpendicular to the interface. Similarities in two-point correlations of hydrogen bond network geometry point to shared ice-like intermolecular structure in the parallel direction as well. Our results bolster and significantly extend previous conceptions of ice-like structure at the liquid's boundary, and suggest that the much-discussed quasi-liquid layer on ice evolves subtly above the melting point into a quasi-ice layer at the surface of liquid water.

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