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Title: The THz Spectrum of Density Fluctuations of Water: The Viscoelastic Regime

Abstract

Relevant advances in the knowledge of the water dynamics at mesoscopic scales are reviewed, while mainly focusing on the contribution provided by high resolution inelastic X-ray scattering (IXS). In particular it is discussed how the use of IXS has improved our understanding of viscoelastic properties of water at THz frequencies. This specifically involves some solid-like features such as the onset of shear wave propagation, a sound velocity surprisingly similar to the one of ice, and an anomalously low sound absorption coefficient. All these properties can be explained by assuming the coupling of THz density fluctuations with a structural relaxation process connected to the breaking and forming of hydrogen bonds (HBs). This review also includes more recent IXS results demonstrating that, upon approaching supercritical conditions, relaxation phenomena in water gradually lose their structural character becoming essentially collisional in character. Furthermore, GHz spectroscopy results on supercooled water, suggesting the occurrence of a structural arrest, are discussed. An overview of the new opportunities offered by next generation IXS spectrometers finally concludes this review.

Authors:
 [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Research Org.:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1324811
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Advances in Condensed Matter Physics
Additional Journal Information:
Journal Volume: 2015; Journal ID: ISSN 1687-8108
Publisher:
Hindawi
Country of Publication:
United States
Language:
ENGLISH
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Cunsolo, Alessandro. The THz Spectrum of Density Fluctuations of Water: The Viscoelastic Regime. United States: N. p., 2015. Web. doi:10.1155/2015/137435.
Cunsolo, Alessandro. The THz Spectrum of Density Fluctuations of Water: The Viscoelastic Regime. United States. https://doi.org/10.1155/2015/137435
Cunsolo, Alessandro. 2015. "The THz Spectrum of Density Fluctuations of Water: The Viscoelastic Regime". United States. https://doi.org/10.1155/2015/137435. https://www.osti.gov/servlets/purl/1324811.
@article{osti_1324811,
title = {The THz Spectrum of Density Fluctuations of Water: The Viscoelastic Regime},
author = {Cunsolo, Alessandro},
abstractNote = {Relevant advances in the knowledge of the water dynamics at mesoscopic scales are reviewed, while mainly focusing on the contribution provided by high resolution inelastic X-ray scattering (IXS). In particular it is discussed how the use of IXS has improved our understanding of viscoelastic properties of water at THz frequencies. This specifically involves some solid-like features such as the onset of shear wave propagation, a sound velocity surprisingly similar to the one of ice, and an anomalously low sound absorption coefficient. All these properties can be explained by assuming the coupling of THz density fluctuations with a structural relaxation process connected to the breaking and forming of hydrogen bonds (HBs). This review also includes more recent IXS results demonstrating that, upon approaching supercritical conditions, relaxation phenomena in water gradually lose their structural character becoming essentially collisional in character. Furthermore, GHz spectroscopy results on supercooled water, suggesting the occurrence of a structural arrest, are discussed. An overview of the new opportunities offered by next generation IXS spectrometers finally concludes this review.},
doi = {10.1155/2015/137435},
url = {https://www.osti.gov/biblio/1324811}, journal = {Advances in Condensed Matter Physics},
issn = {1687-8108},
number = ,
volume = 2015,
place = {United States},
year = {Thu Feb 26 00:00:00 EST 2015},
month = {Thu Feb 26 00:00:00 EST 2015}
}

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Cited by: 16 works
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Works referencing / citing this record:

The onset of shear modes in the high frequency spectrum of simple disordered systems: current knowledge and perspectives
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Interpreting the Terahertz Spectrum of Complex Materials: The Unique Contribution of the Bayesian Analysis
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Interpreting the Terahertz Spectrum of Complex Materials: The Unique Contribution of the Bayesian Analysis
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