[C_2mim][Ala]丙氨酸离子液体水溶液粘滞流动的活化参数  

Parameters of the Activation of Viscous Flow of Aqueous [C_2mim][Ala]

作　　者：佟静[1] 刘璐[1] 张朵[1] 郑煦 陈霞[1] 杨家振[1] 

机构地区：[1]辽宁大学化学院,沈阳110036

出　　处：《物理化学学报》2017年第3期513-519,共7页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(21273003)资助项目~~

摘　　要：在288.15-328.15 K温度范围内,测量了不同浓度的氨基酸离子液体[C_2mim][Ala]水溶液的密度和粘度,根据J ones-Dole方程得到了较大正值的粘度B系数并且dB/dT<0。借助Feakins理论,计算了溶质对溶液粘滞流动活化自由能贡献Δμ_2^(≠0),根据Δμ_2^(≠0)随温度的线性变化,进而得到流动活化熵ΔS_2^(≠0)和活化焓ΔH_2^(≠0);在E yring液体粘度的过渡态理论基础上,提出了预测离子液体[C_2mim][Ala]水溶液粘度的半经验新方法,其预测值与相应的实验值很好的一致。The density and viscosity of aqueous solutions of an ionic liquid （IL） based on alanine, [C2mim][Ala], with various molalities were measured in the temperature range of T = 288.15-328.15 K with intervals of 5 K. From the Jones-Dole equation, a viscosity B-coefficient with a large positive value and dB/dT〈 0 were obtained. According to Feakins, the contribution of the solute to the activation free energy for viscous flow of the solution, △μ20, was obtained. The relationship between △μ20 and temperature was linear, allowing the standard molar activation entropy, AS;~2, and enthalpy, △H20, to be obtained. On the basis of Eydng＇s theory, a new semi-empirical method to estimate the viscosity of aqueous [C2mim][Ala] was proposed. The values estimated using this method agreed well with the corresponding experimental ones.

关 键 词：离子液体 溶液粘度 粘度B系数 粘滞流动活化参数 过渡态理论 

分 类 号：O645.1[理学—物理化学]