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Published on: March 13, 2017
Two States of Water Converge to One State below 215 K
Kouki Oka1, Toshimichi Shibue2, Natsuhiko Sugimura2
1Department of Applied Chemistry and Research Institute for Science and Engineering, Waseda University, 3-4-1 Okubo Shinjuku, Tokyo 169-8555, Japan.
Abstract:
Anomalies of water have been explained by the two-state water model. In the model, water becomes one state upon supercooling. However, water crystallizes completely below 235 K ("no man's land"). The structural origin of the anomalous of the water is hidden in the "no man's land". To understand the properties of water, the spectroscopic experiment in "Norman's land" is inevitable. Hence, we proposed a new soft-confinement method for standard nuclear magnetic resonance spectroscopy to explore the "no man's land". We found the singularity temperature (215 K) at ambient pressure. Water exists in one state below 215 K. Above 215 K, the two states of water are supercritical states of the liquid-liquid critical point. The current study provides a perspective to determine the liquid-liquid critical point of water existing in a high-pressure condition.
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