期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 106, 期 12, 页码 4596-4600出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0812481106
关键词
liquid-liquid hypothesis; supercooled water; water phases; high-density liquid
资金
- National Institutes of Health [001646]
- Department of Energy [DE-FG02-97ER62443]
- National Science Foundation [DMR-0225180]
- National Institutes of Health-National Institute of General Medical Sciences
Polymorphism of water has been extensively studied, but controversy still exists over the phase transition between high-density amorphous (HDA) and low-density amorphous (LDA) ice. We report the phase behavior of HDA ice inside high-pressure cryocooled protein crystals. Using X-ray diffraction, we demonstrate that the intermediate states in the temperature range from 80 to 170 K can be reconstructed as a linear combination of HDA and LDA ice, suggesting a first-order transition. We found evidence for a liquid state of water during the ice transition based on the protein crystallographic data. These observations open the possibility that the HDA ice induced by high-pressure cryocooling is a genuine glassy form of high-density liquid.
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