[C2mim][Ala]丙氨酸离子液体水溶液粘滞流动的活化参数

doi:10.3866/PKU.WHXB201610251

Abstract

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

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Jing TONG,Lu LIU,Duo ZHANG,Xu ZHENG,Xia CHEN,Jia-Zhen YANG. Parameters of the Activation of Viscous Flow of Aqueous[C₂mim] [Ala][J]. Acta Phys. -Chim. Sin. 2017, 33(3), 513-519. doi: 10.3866/PKU.WHXB201610251

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

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