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arXiv 2208.13633cond-mat.stat-mechphysics.chem-ph
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水的液-液相变的第一性原理

Liquid-liquid transition in water from first principles

Thomas E. Gartner, Pablo M. Piaggi, Roberto Car, Athanassios Z. Panagiotopoulos, Pablo G. Debenedetti

摘要:

水研究中一个长期存在的问题是过冷液体水可以经历液-液相变(LLT)成为高密度和低密度液体的可能性。我们使用了几种互补的分子模拟技术来评估LLT的可能性,在一个从头算神经网络模型的水训练密度泛函理论计算与SCAN交换相关功能。我们最终表明存在一个一阶LLT和相关的临界点的SCAN描述的水,代表第一个明确的计算证据LLT在水中的第一原则。

英文摘要:

A longstanding question in water research is the possibility that supercooled liquid water can undergo a liquid-liquid phase transition (LLT) into high- and low-density liquids. We used several complementary molecular simulation techniques to evaluate the possibility of an LLT in an ab initio neural network model of water trained on density functional theory calculations with the SCAN exchange correlation functional. We conclusively show the existence of a first-order LLT and an associated critical point in the SCAN description of water, representing the first definitive computational evidence for an LLT in water from first principles.

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