[C_2mim][Ala]丙氨酸离子液体水溶液粘滞流动的活化参数

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/dT0。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。

Parameters of the Activation of Viscous Flow of Aqueous[C2mim] [Ala]

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, Δμ₂^≠0, was obtained. The relationship between Δμ₂^≠0 and 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 aqueousC₂mim] Ala] was proposed. The values estimated using this method agreed well with the corresponding experimental ones.