title: The fragile-to-strong dynamic crossover transition in confined water: nuclear magnetic resonance results.
abstract: By means of a nuclear magnetic resonance experiment, we give evidence of the existence of a fragile-to-strong dynamic crossover transition (FST) in confined water at a temperature T(L)=223+/-2 K. We have studied the dynamics of water contained in 1D cylindrical nanoporous matrices (MCM-41-S) in the temperature range 190-280 K, where experiments on bulk water were so far hampered by crystallization. The FST is clearly inferred from the T dependence of the inverse of the self-diffusion coefficient of water (1D) as a crossover point from a non-Arrhenius to an Arrhenius behavior. The combination of the measured self-diffusion coefficient D and the average translational relaxation time tau(T), as measured by neutron scattering, shows the predicted breakdown of Stokes-Einstein relation in deeply supercooled water.
authors: Dipartimento di Fisica and CNISM, Universita' di Messina, Vill. S. Agata CP 55, 98166 Messina, Italy. francesco.mallamace@unime.it
authors: F
authors: F
authors: Mallamace
authors: M
authors: M
authors: Broccio
authors: C
authors: C
authors: Corsaro
authors: A
authors: A
authors: Faraone
authors: U
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authors: Wanderlingh
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authors: Liu
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authors: CY
authors: Mou
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authors: Chen