On the existence of soliton-like collective modes in liquid water at the viscoelastic crossover

Abstract The problem of large-density variations in supercooled and ambient water has been widely discussed in the past years. Recent studies have indicated the possibility of nanometer-sized density variations on the subpicosecond and picosecond time scales. The nature of fluctuating density hetero...

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Autores principales:	V. E. Zakhvataev, L. A. Kompaniets
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/e0468a2dfd5b4e75a14ff990303b3caa
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spelling	oai:doaj.org-article:e0468a2dfd5b4e75a14ff990303b3caa2021-12-02T13:34:58ZOn the existence of soliton-like collective modes in liquid water at the viscoelastic crossover10.1038/s41598-021-84277-82045-2322https://doaj.org/article/e0468a2dfd5b4e75a14ff990303b3caa2021-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-84277-8https://doaj.org/toc/2045-2322Abstract The problem of large-density variations in supercooled and ambient water has been widely discussed in the past years. Recent studies have indicated the possibility of nanometer-sized density variations on the subpicosecond and picosecond time scales. The nature of fluctuating density heterogeneities remains a highly debated issue. In the present work, we address the problem of possible association of such density variations with the dynamics of terahertz longitudinal acoustic-like modes in liquid water. Our study is based on the fact that the subpicosecond dynamics of liquid water are essentially governed by the structural relaxation. Using a mode coupling theory approach, we found that for typical values of parameters of liquid water, the dynamic mechanism coming from the combination of the structural relaxation process and the finiteness of the amplitude of terahertz longitudinal acoustic-like mode gives rise to a soliton-like collective mode on a temperature-dependent nanometer length scale. The characteristics of this mode are consistent with the estimates of the amplitudes and temperature-dependent correlation lengths of density fluctuations in liquid water obtained in experiments and simulations. Thus, the fully dynamic mechanism could contribute to the formation and dynamics of fluctuating density heterogeneities. The soliton-like collective excitations suggested by our analysis may be relevant to different phenomena connected with supercooled water and can be expected to be associated with some ultrafast biological processes.V. E. ZakhvataevL. A. KompanietsNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q V. E. Zakhvataev L. A. Kompaniets On the existence of soliton-like collective modes in liquid water at the viscoelastic crossover
description	Abstract The problem of large-density variations in supercooled and ambient water has been widely discussed in the past years. Recent studies have indicated the possibility of nanometer-sized density variations on the subpicosecond and picosecond time scales. The nature of fluctuating density heterogeneities remains a highly debated issue. In the present work, we address the problem of possible association of such density variations with the dynamics of terahertz longitudinal acoustic-like modes in liquid water. Our study is based on the fact that the subpicosecond dynamics of liquid water are essentially governed by the structural relaxation. Using a mode coupling theory approach, we found that for typical values of parameters of liquid water, the dynamic mechanism coming from the combination of the structural relaxation process and the finiteness of the amplitude of terahertz longitudinal acoustic-like mode gives rise to a soliton-like collective mode on a temperature-dependent nanometer length scale. The characteristics of this mode are consistent with the estimates of the amplitudes and temperature-dependent correlation lengths of density fluctuations in liquid water obtained in experiments and simulations. Thus, the fully dynamic mechanism could contribute to the formation and dynamics of fluctuating density heterogeneities. The soliton-like collective excitations suggested by our analysis may be relevant to different phenomena connected with supercooled water and can be expected to be associated with some ultrafast biological processes.
format	article
author	V. E. Zakhvataev L. A. Kompaniets
author_facet	V. E. Zakhvataev L. A. Kompaniets
author_sort	V. E. Zakhvataev
title	On the existence of soliton-like collective modes in liquid water at the viscoelastic crossover
title_short	On the existence of soliton-like collective modes in liquid water at the viscoelastic crossover
title_full	On the existence of soliton-like collective modes in liquid water at the viscoelastic crossover
title_fullStr	On the existence of soliton-like collective modes in liquid water at the viscoelastic crossover
title_full_unstemmed	On the existence of soliton-like collective modes in liquid water at the viscoelastic crossover
title_sort	on the existence of soliton-like collective modes in liquid water at the viscoelastic crossover
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/e0468a2dfd5b4e75a14ff990303b3caa
work_keys_str_mv	AT vezakhvataev ontheexistenceofsolitonlikecollectivemodesinliquidwaterattheviscoelasticcrossover AT lakompaniets ontheexistenceofsolitonlikecollectivemodesinliquidwaterattheviscoelasticcrossover
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On the existence of soliton-like collective modes in liquid water at the viscoelastic crossover

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