Mallamace Francesco, Corsaro Carmelo, Mallamace Domenico, Vasi Sebastiano, Vasi Cirino, Stanley H Eugene
Department of Physics, Center for Polymer Studies, Boston University, Boston, Massachusetts 02215, USA.
Dipartimento MIFT, Sezione di Fisica, Università di Messina, I-98166 Messina, Italy.
J Chem Phys. 2016 Jan 7;144(1):014501. doi: 10.1063/1.4939087.
We study the self-diffusion coefficient and viscosity of a water-glycerol mixture for several glycerol molar fractions as a function of temperature well inside the metastable supercooled regime. We perform NMR experiments and verify that the system has at different concentration a fragile-to-strong crossover accompanied by the violation of the Stokes-Einstein relation. We observe that the crossover temperature depends on the water amount. Studying the fractional representation of the Stokes-Einstein relation, we find that in these systems dynamical arrest does not exhibit criticality and the transport parameters have a universal behavior.
我们研究了在亚稳过冷区域内，水 - 甘油混合物在几个甘油摩尔分数下的自扩散系数和粘度随温度的变化。我们进行了核磁共振实验，并验证了该系统在不同浓度下存在从易碎到强的转变，同时伴随着斯托克斯 - 爱因斯坦关系的违反。我们观察到转变温度取决于水的含量。通过研究斯托克斯 - 爱因斯坦关系的分数表示，我们发现在这些系统中，动力学阻滞不表现出临界性，并且传输参数具有普遍行为。
