Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 110, Issue 13, Pages 4899-4904Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1221805110
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Funding
- MURST-PRIN
- Fondazione Frisone
- National Science Foundation [CHE-1213217, CHE 0911389, CHE 0908218]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [0911389, 1213217] Funding Source: National Science Foundation
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [0908218] Funding Source: National Science Foundation
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The anomalous behavior of thermodynamic response functions is an unsolved problem in the physics of water. The mechanism that gives rise to the dramatic indefinite increase at low temperature in the heat capacity, the compressibility, and the coefficient of thermal expansion, is unknown. We explore this problem by analyzing both new and existing experimental data on the power spectrum S( Q, omega) of bulk and confined water at ambient pressure. When decreasing the temperature, we find that the liquid undergoes a structural transformation coinciding with the onset of an extended hydrogen bond network. This network onset seems to give rise to the marked viscoelastic behavior, consistent with the interesting possibility that the sound velocity and response functions of water depend upon both the frequency and wave vector.
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