Why Does Water Expand When It Cools?

被引:21
|
作者
Matsumoto, Masakazu [1 ]
机构
[1] Nagoya Univ, Res Ctr Mat Sci, Chikusa Ku, Aichi 4648602, Japan
关键词
LIQUID PHASE-TRANSITION; MOLECULAR-DYNAMICS; GLASSY WATER; BEHAVIOR; ORDER; MODEL; H2O;
D O I
10.1103/PhysRevLett.103.017801
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The origin of the density anomaly of water is often explained in terms of the mixture model, in which the low-density ordered "icelike" component dominates by cooling. However, such an explanation based on heterogeneity conflicts with microscopic observations by computer simulation. Actually, heterogeneity in structure exists and a microscopic density fluctuation is observable; still, it is found that the density decreases quite homogeneously irrespective of the differences in local structure. Our finding of two linear correlations, the bond length against temperature and contraction against angular distortion, recovers the density anomaly of water without invoking heterogeneity.
引用
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页数:4
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