Suppression of the dynamic transition in surface water at low hydration levels: a study of water on rutile

Journal Article · Wed Dec 31 23:00:00 EST 2008 · Physical Review E

DOI:https://doi.org/10.1103/PhysRevE.79.051504· OSTI ID:953186

Mamontov, Eugene ^[1]; Vlcek, L. ^[2]; Wesolowski, David J ^[1]; Cummings, Peter T ^[1]; Rosenqvist, Jorgen K ^[1]; Wang, Wei ^[1]; Cole, David R ^[1]; Gasparovic, Goran ^[3]

---

1. ORNL
2. Vanderbilt University
3. NCNR and University of Maryland

Our quasielastic neutron scattering experiments and molecular dynamics simulations demonstrate that a sufficiently high hydration level is a prerequisite for the temperature-dependent dynamic crossover on the time scale of hundreds of picoseconds in the surface water on rutile (TiO2). Below the hydration level corresponding to the monolayer coverage of mobile surface water, a weak temperature dependence of the relaxation times with no apparent dynamic crossover is observed. We associate the dynamic crossover with inter-layer jumps of the mobile water molecules, which become possible only at a sufficiently high hydration level.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 953186
• Journal Information: Physical Review E, Journal Name: Physical Review E Journal Issue: 5 Vol. 79
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
HYDRATION
NEUTRONS
RELAXATION TIME
RUTILE
SCATTERING
SURFACE WATERS
TEMPERATURE DEPENDENCE
WATER