The Violation of Stokes-Einstein Relation in Supercooled Water

Details The Violation of Stokes-Einstein Relation in Supercooled Water The Violation of Stokes-Einstein Relation in Supercooled Water

2006-05-17

arxiv.org/abs/cond-mat/0605431v1

Physics

Condensed Matter

Soft Condensed Matter

5 pages, 3 figures

Scientific paper

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 about 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.

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