The fragile-to-strong dynamic crossover transition in confined water: Nuclear magnetic resonance results

F. Mallamace, M. Broccio, C. Corsaro, A. Faraone, U. Wanderlingh, L. Liu, C. Y. Mou, S. H. Chen

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186 引文 斯高帕斯(Scopus)

摘要

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 TL =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 〈 τT 〉, as measured by neutron scattering, shows the predicted breakdown of Stokes-Einstein relation in deeply supercooled water.

原文英語
文章編號161102
期刊Journal of Chemical Physics
124
發行號16
DOIs
出版狀態已發佈 - 2006
對外發佈

ASJC Scopus subject areas

  • 物理與天文學 (全部)
  • 物理與理論化學

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