Acta Phys. -Chim. Sin. ›› 2017, Vol. 33 ›› Issue (3): 513-519.doi: 10.3866/PKU.WHXB201610251

• ARTICLE • Previous Articles     Next Articles

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
  • Supported by:
    the National Natural Science Foundation of China(21273003)


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