The violation of the Stokes-Einstein relation in supercooled water

Sow Hsin Chen, Francesco Mallamace, Chung Yuan Mou, Matteo Broccio, Carmelo Corsaro, Antonio Faraone, Li Liu

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272 引文 斯高帕斯(Scopus)

摘要

By confining water in nanopores, so narrow that the liquid cannot freeze, it is possible to explore its properties well below its homogeneous nucleation temperature TH ≈ 235 K. In particular, the dynamical parameters of water can be measured down to 180 K, approaching the suggested glass transition temperature Tg ≈ 165 K. Here we present experimental evidence, obtained from Nuclear Magnetic Resonance and Quasi-Elastic Neutron Scattering spectroscopies, of a well defined decoupling of transport properties (the self-diffusion coefficient and the average translational relaxation time), which implies the breakdown of the Stokes-Einstein relation. We further show that such a non-monotonic decoupling reflects the characteristics of the recently observed dynamic crossover, at ≈225 K, between the two dynamical behaviors known as fragile and strong, which is a consequence of a change in the hydrogen bond structure of liquid water.

原文英語
頁(從 - 到)12974-12978
頁數5
期刊Proceedings of the National Academy of Sciences of the United States of America
103
發行號35
DOIs
出版狀態已發佈 - 8月 29 2006
對外發佈

ASJC Scopus subject areas

  • 多學科

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