## 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 |

卷 | 124 |

發行號 | 16 |

DOIs | |

出版狀態 | 已發佈 - 2006 |

對外發佈 | 是 |

## ASJC Scopus subject areas

- 物理與天文學 (全部)
- 物理與理論化學