物理化学学报 >> 2017, Vol. 33 >> Issue (3): 513-519.doi: 10.3866/PKU.WHXB201610251

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[C2mim][Ala]丙氨酸离子液体水溶液粘滞流动的活化参数

佟静*(),刘璐,张朵,郑煦,陈霞,杨家振   

  • 收稿日期:2016-09-13 发布日期:2017-03-07
  • 通讯作者: 佟静 E-mail:tongjinglnu@sina.com
  • 基金资助:
    国家自然科学基金(21273003)

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

Jing TONG*(),Lu LIU,Duo ZHANG,Xu ZHENG,Xia CHEN,Jia-Zhen YANG   

  • Received:2016-09-13 Published:2017-03-07
  • Contact: Jing TONG E-mail:tongjinglnu@sina.com
  • Supported by:
    the National Natural Science Foundation of China(21273003)

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Jones-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Eyring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。

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

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 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 aqueous[C2mim] [Ala] was proposed. The values estimated using this method agreed well with the corresponding experimental ones.

Key words: Ionic liquid, Viscosity of solution, Viscosity B-coefficient, Activation parameter for viscous flow of solution, Transition-state theory

MSC2000: 

  • O642