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Citation: TONG Jing, CHEN Teng-Fei, ZHANG Duo, WANG Lin-Fu, TONG Jian, YANG Jia-Zhen. Molar Surface Gibbs Free Energy of the Aqueous Solution of the Ionic Liquid [C2mim][OAc][J]. Acta Physico-Chimica Sinica, ;2016, 32(5): 1161-1167. doi: 10.3866/PKU.WHXB201602232 shu

Molar Surface Gibbs Free Energy of the Aqueous Solution of the Ionic Liquid [C2mim][OAc]

  • 1.

    College of Chemistry, Liaoning University, Shenyang 110036, P. R. China

  • Corresponding author: TONG Jing, 
  • Received Date: 27 November 2015
    Available Online: 22 February 2016

    Fund Project: 国家自然科学基金(21273003) (21273003)辽宁省教育厅项目(LJQ2013001) (LJQ2013001)辽宁省百千万人才项目(2013921029)资助 (2013921029)

  • The values of the density and surface tension for an aqueous solution of the ionic liquid (IL) 1-ethyl-3-methylimidazolium acetate [C2mim][OAc] with various molalities were measured from 288.15 to 318.15 K with intervals of 5 K. Based on the thermodynamic model of the surface tension of a solution proposed by LI Yi-Gui et al., a new concept of the molar surface Gibbs free energy was proposed and a linear empirical equation between the molar surface Gibbs free energy and the concentration of the solution was established. Using this empirical equation, the molar surface Gibbs free energy of aqueous [C2mim][OAc] was estimated. Using the estimated molar surface Gibbs free energy, the surface tension of the solution was predicted. The predicted values and corresponding experimental values are in agreement. Thus, the molar surface Gibbs free energy may become a semi-empirical method to predict the properties of ILs and their solution parachor. From the molar Gibbs free energy, a new Eötvös equation was obtained and each parameter of the new equation has a clear physical meaning.
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