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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Solute dependence of mobility of solvent molecules in solvophobic solute solutions: Dielectric relaxation of nonpolar solute/alcohol mixtures
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Solute dependence of mobility of solvent molecules in solvophobic solute solutions: Dielectric relaxation of nonpolar solute/alcohol mixtures

机译：疏溶剂溶质溶液中溶剂分子迁移率的溶质依赖性：非极性溶质/醇混合物的介电弛豫

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The dielectric relaxation spectra of alcoholonpolar solute mixtures are measured at several temperatures (-15 degrees C <= T <= 25 degrees C) and for several molar fractions of solute (0 <= X-s <= 0.114) in the frequency range of 200 MHz <= v <= 20 GHz. The double-Debye-type function is used for fitting of the spectra of mixtures, and the mean dielectric relaxation times (tau(mean)) Of alcohol molecules are determined. In the systems having strong interaction between alcohol and nonpolar solutes, tau(mean) becomes shorter with an increase in the concentration of the solutes. On the other hand, tau(mean) becomes longer in the system having weak interaction between alcohol and nonpolar solutes. These results contradict with our intuitive predictions, do not correspond to mixing enthalpy, and are not explained by the hydrodynamic theory. They are attributed to the mechanism of the coupling between long-range electrostatic interactions and concentration fluctuation caused by the addition of solutes, which is suggested by Yamaguchi et al. based on the mode-coupling theory.
机译：酒精/非极性溶质混合物的介电弛豫谱在以下温度范围内的几个温度下（-15摄氏度<= T≤25摄氏度）和几个摩尔分数的溶质（0 <= Xs <= 0.114）下进行测量200 MHz <= v <= 20 GHz。使用双德拜型函数拟合混合物的光谱，并确定酒精分子的平均介电弛豫时间（tau（mean））。在醇和非极性溶质之间具有强相互作用的体系中，tau（mean）随着溶质浓度的增加而变短。另一方面，tau（mean）在酒精与非极性溶质之间的相互作用较弱的系统中变得更长。这些结果与我们的直觉预测相矛盾，不对应于混合焓，流体动力学理论也未对此进行解释。它们归因于远距离静电相互作用与溶质添加引起的浓度波动之间的耦合机理，这是Yamaguchi等人提出的。基于模式耦合理论

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