What is the primary mover of water dynamics?

Literature Information

Publication Date 2015-05-07
DOI 10.1039/C5CP01871D
Impact Factor 3.676
Authors

S. R. Tripathi, K. Kawase, A. Puzenko, Yu. Feldman


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Abstract

Even today, the H-bonded cluster structure of water still stands as a major point of debate in the science of liquids. Much of this discussion is devoted to understand its dynamic nature. This has a direct impact on deciphering the many anomalies of water such as its exceptional heat capacity. Of these properties, dielectric permittivity and relaxation are of particular interest. The argument rages over whether the almost Debye-like character of the dispersion is the result of the reorientation of an apparent dipole moment of the water cluster or simply the cumulative effect of single water molecule reorientation. Furthermore, like many glass formers, it has a high frequency excess wing that does not fit into the accepted models of a single relaxation time of the main peak. Herein, we present evidence that the microscopic origins of both the excess wing and the main relaxation process of pure water are the same. The origin of these two features is explored and we suggest a new paradigm for water relaxation based on the concept of a proton cascade leading to a cluster reorientation.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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