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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >The violation of the Stokes-Einstein relation in supercooled water
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The violation of the Stokes-Einstein relation in supercooled water

机译：过冷水中对Stokes-Einstein关系的违反

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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 T_H ≈ 235 K. In particular, the dynamical parameters of water can be measured down to 180 K, approaching the suggested glass transition temperature T_g ≈ 165 K. Here we present experimental evidence, obtained from Nuclear Magnetic Resonance and Quasi-Elastic Neutron Scattering spec-troscopies, 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.
机译：通过将水限制在纳米孔之内，以至于液体无法冻结，范围很窄，就可以探索其在均匀成核温度T_H≈235 K以下的性能。特别是，水的动力学参数可以测量到低至180 K，接近于建议的玻璃化转变温度T_g≈165K。在这里，我们提供从核磁共振和准弹性中子散射光谱学获得的传输特性（自扩散系数和平均平移弛豫时间）的明确解耦的实验证据。 ），这意味着斯托克斯-爱因斯坦关系破裂。我们进一步表明，这种非单调解耦反映了最近观察到的动态交越的特征，在约225 K时，这两个动力学行为称为脆弱和强固，这是液体氢键结构发生变化的结果水。

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