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Kim, Chae Un
High Pressure X-ray Science Lab (HiPreX)
Research Interests
  • X-ray Science, biophysical science, biomedical science

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Glass-to-cryogenic-liquid transitions in aqueous solutions suggested by crack healing

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Title
Glass-to-cryogenic-liquid transitions in aqueous solutions suggested by crack healing
Author
Kim, Chae UnTate, Mark W.Gruner, Sol M.
Issue Date
2015-09
Publisher
NATL ACAD SCIENCES
Citation
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, v.112, no.38, pp.11765 - 11770
Abstract
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 (∼235 K at 0.1 MPa). We report optical and X-ray observations suggestive of glass-to-liquid 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-to-liquid 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.
URI
https://scholarworks.unist.ac.kr/handle/201301/16862
URL
http://www.pnas.org/content/early/2015/09/03/1510256112.abstract
DOI
10.1073/pnas.1510256112
ISSN
0027-8424
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PHY_Journal Papers
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