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

Research output: Contribution to journalArticlepeer-review

272 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)12974-12978
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Volume103
Issue number35
DOIs
Publication statusPublished - Aug 29 2006
Externally publishedYes

Keywords

  • Decoupling of transport properties
  • Dynamic crossover
  • MCM-41

ASJC Scopus subject areas

  • General

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