【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[C₂mim][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Δμ₂^≠0,根据Δμ₂^≠0随温度的线性变化,进而得到流动活化熵ΔS₂^≠0和活化焓ΔH₂^≠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[C₂mim][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。更多还原

【Abstract】 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 d B/d T < 0 were obtained.According to Feakins, the contribution of the solute to the activation free energy for viscous flow of the solution,Δμ₂^≠0, was obtained. The relationship between Δμ₂^≠0and temperature was linear, allowing the standard molar activation entropy, ΔS₂^≠0, and enthalpy, ΔH₂^≠0, to be obtained. On the basis of Eyring′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.更多还原