Ngai K L
Naval Research Laboratory, Washington, DC 20375-5320 and Dipartimento di Fisica and INFM (UdR Pisa), Università di Pisa, Largo B. Pontecorvo 3, I-56127, Pisa, Italy.
J Phys Chem B. 2006 Dec 28;110(51):26211-4. doi: 10.1021/jp065601c.
From their experimental studies of the supercooled molecular ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate (BMIM-HFP), Ito and Richert [J. Phys. Chem. B 2006, in press.] found that the Stokes-Einstein and the Debye-Stokes-Einstein laws do not hold. Instead, enhanced translational diffusion or fractional Stokes-Einstein and fractional Debye-Stokes-Einstein relations are observed, just like in nonionic glass-forming liquids, including 1,3-bis(1-naphthyl)-5-(2-naphthyl)benzene, o-terphenyl, and sucrose benzoate. The comprehensive measurements made by Ito and Richert have determined the critical parameters that the coupling model needs to explain the observed fractional Stokes-Einstein and fractional Debye-Stokes-Einstein relations in the supercooled molecular ionic liquid.
通过对过冷分子离子液体1-丁基-3-甲基咪唑六氟磷酸盐（BMIM-HFP）的实验研究，伊藤和里歇特[《物理化学杂志B》，2006年，待发表]发现斯托克斯-爱因斯坦定律和德拜-斯托克斯-爱因斯坦定律并不成立。相反，观察到了增强的平移扩散或分数斯托克斯-爱因斯坦关系以及分数德拜-斯托克斯-爱因斯坦关系，就像在非离子玻璃形成液体中一样，包括1,3-双（1-萘基）-5-（2-萘基）苯、邻三联苯和蔗糖苯甲酸酯。伊藤和里歇特进行的全面测量确定了耦合模型解释过冷分子离子液体中观察到的分数斯托克斯-爱因斯坦关系和分数德拜-斯托克斯-爱因斯坦关系所需的关键参数。
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