Fast vs slow water: explaining the fragile-to-strong transition

A Japanese research team led by The University of Tokyo investigated the fragile-to-strong transition of water. Unlike most liquids, when water is cooled, the rate of increase of its viscosity reaches a maximum at a certain low temperature. The team showed that modeling water as a temperature-dependent mixture of two states -- disordered 'fast' water and locally ordered 'slow' water -- explained the fragile-to-strong transition and avoided the faulty predictions of earlier theories based on glassy behavior.

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