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The Violation of 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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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 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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Sow-Hsin Chen, Francesco Mallamace, Chung-Yuan Mou, Matteo Broccio, Carmelo Corsaro, Antonio Faraone, Li Liu. 2006-05-17. The Violation of Stokes-Einstein Relation in Supercooled Water. https://arxiv.org/abs/cond-mat/0605431

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