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Title: Viscosity and real-space molecular motion of water: Observation with inelastic x-ray scattering

Journal Article · · Physical Review E
 [1];  [1];  [2];  [3];  [4];  [5];  [6]
  1. Univ. of Tennessee, Knoxville, TN (United States)
  2. Oita Univ. (Japan)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. RIKEN, Sayo (Japan); Japan Synchrotron Radiation Research Inst., Sayo (Japan)
  5. RIKEN, Sayo (Japan)
  6. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Even though viscosity is one of the fundamental properties of liquids, its microscopic origin is not fully understood. We determined the spatial and temporal correlation of molecular motions of water near room temperature and its temperature variation on a picosecond timescale and a subnanometer spatial scale, through high-resolution inelastic x-ray scattering measurement. The results, expressed in terms of the time-dependent pair correlation function called the Van Hove function, show that the timescale of the decay of the molecular correlation is directly related to the Maxwell relaxation time near room temperature, which is proportional to viscosity. This conclusion validates our earlier finding that the topological changes in atomic or molecular connectivity are the origin of viscosity in liquids.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1476425
Alternate ID(s):
OSTI ID: 1463938
Journal Information:
Physical Review E, Vol. 98, Issue 2; ISSN 2470-0045
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 18 works
Citation information provided by
Web of Science

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Cited By (4)

Aqueous two‐phase systems based on deep eutectic solvents and their application in green separation processes journal December 2019
Translational and rotational dynamics of high and low density TIP4P/2005 water journal June 2019
Radial distribution functions of water: Models vs experiments journal July 2019
Real-Space Description of Dynamics of Liquids journal October 2018

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