期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 112, 期 38, 页码 11765-11770出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1510256112
关键词
glass-to-liquid transition; high-density amorphous ice; low-density amorphous ice; quenched HDA; first-order phase transition
资金
- National Science Foundation (NSF)
- NIH/NIGMS via NSF Award [DMR-1332208]
- National Institute of General Medical Sciences (NIGMS) Award [GM103485]
- Basic Science Program through the National Research Foundation of Korea - Ministry of Science, ICT and Future Planning [2014R1A2A1A11051254]
- National Research Foundation of Korea [2014R1A2A1A11051254] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Observation of theorized glass-to-liquid transitions between low-density amorphous (LDA) and high-density amorphous (HDA) water states had been stymied by rapid crystallization below the homogeneous water nucleation temperature (similar to 235 K at 0.1 MPa). We report optical and X-ray observations suggestive of glass-toliquid transitions in these states. Crack healing, indicative of liquid, occurs when LDA ice transforms to cubic ice at 160 K, and when HDA ice transforms to the LDA state at temperatures as low as 120 K. X-ray diffraction study of the HDA to LDA transition clearly shows the characteristics of a first-order transition. Study of the glass-toliquid transitions in nanoconfined aqueous solutions shows them to be independent of the solute concentrations, suggesting that they represent an intrinsic property of water. These findings support theories that LDA and HDA ice are thermodynamically distinct and that they are continuously connected to two different liquid states of water.
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