The THz Spectrum of Density Fluctuations of Water: The Viscoelastic Regime
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 properti...
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Wiley
2015-01-01
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| Series: | Advances in Condensed Matter Physics |
| Online Access: | http://dx.doi.org/10.1155/2015/137435 |
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| author | Alessandro Cunsolo |
| author_facet | Alessandro Cunsolo |
| author_sort | Alessandro Cunsolo |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-fbfbf12e74b64d4386ca78289534e5f4 |
| institution | Kabale University |
| issn | 1687-8108 1687-8124 |
| language | English |
| publishDate | 2015-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Condensed Matter Physics |
| spelling | doaj-art-fbfbf12e74b64d4386ca78289534e5f42025-02-03T01:09:41ZengWileyAdvances in Condensed Matter Physics1687-81081687-81242015-01-01201510.1155/2015/137435137435The THz Spectrum of Density Fluctuations of Water: The Viscoelastic RegimeAlessandro Cunsolo0Photon Sciences Directorate-Brookhaven National Laboratory, P.O. Box 5000, Upton, NY 11973, USARelevant 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.http://dx.doi.org/10.1155/2015/137435 |
| spellingShingle | Alessandro Cunsolo The THz Spectrum of Density Fluctuations of Water: The Viscoelastic Regime Advances in Condensed Matter Physics |
| title | The THz Spectrum of Density Fluctuations of Water: The Viscoelastic Regime |
| title_full | The THz Spectrum of Density Fluctuations of Water: The Viscoelastic Regime |
| title_fullStr | The THz Spectrum of Density Fluctuations of Water: The Viscoelastic Regime |
| title_full_unstemmed | The THz Spectrum of Density Fluctuations of Water: The Viscoelastic Regime |
| title_short | The THz Spectrum of Density Fluctuations of Water: The Viscoelastic Regime |
| title_sort | thz spectrum of density fluctuations of water the viscoelastic regime |
| url | http://dx.doi.org/10.1155/2015/137435 |
| work_keys_str_mv | AT alessandrocunsolo thethzspectrumofdensityfluctuationsofwatertheviscoelasticregime AT alessandrocunsolo thzspectrumofdensityfluctuationsofwatertheviscoelasticregime |