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首页> 外文期刊>Fluid Phase Equilibria >Transport properties of protic ionic liquids, pure and in aqueous solutions:Effects of the anion and cation structure
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Transport properties of protic ionic liquids, pure and in aqueous solutions:Effects of the anion and cation structure

机译：质子离子液体在纯溶液和水溶液中的传输特性：阴离子和阳离子结构的影响

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Ionic conductivities of twelve protic ionic liquids (PILs) and their mixtures with water over the whole composition range are reported at 298.15 K and atmospheric pressure. The selected PILs are the pyrrolidinium-based PILs containing nitrate, acetate or formate anions; the formate-based PILs containing diisopropylethylammonium, amilaminium, quinolinium, lutidinium or collidinium cations; and the pyrrolidinium alkylcarboxylates, [Pyrr][C_nH_(2n+1)COO] with n = 5-8. This study was performed in order to investigate the influence of molecular structures of the ions on the ionic conductivities in aqueous solutions. The ionic conductivities of the aqueous solutions are 2-30 times higher than the conductivities of pure PILs. The maximum in conductivity varies from ww = 0.41 to 0.74 and is related to the nature of cations and anions. The molar conductance and the molar conductance at infinite dilution for (PIL + water)solutions are then determined. Self-diffusion coefficients of the twelve protic ionic liquids in water at infinite dilution and at 298.15 K are calculated by using the Nernst-Haskell, the original and the modified Wilke-Chang equations. These calculations show that similar values are obtained using the modified Wilke-Chang and the Nernst-Haskell equations. Finally, the effective hydrodynamic (or Stokes) radius of the PILs was determined by using the Stokes-Einstein equation. A linear relationship was established in order to predict this radius as a function of the anion alkyl chain length in the case of the pyrrolidinium alkvlcarboxvlates PILs.
机译：据报道，在整个组成范围内，十二种质子离子液体（PIL）及其与水的混合物的离子电导率在298.15 K和大气压下。所选择的PIL为含有硝酸根，乙酸根或甲酸根阴离子的基于吡咯烷鎓的PIL;含有二异丙基乙基铵，胺，喹啉鎓，或Collidinium阳离子的甲酸酯基PIL;吡咯烷鎓烷基羧酸盐，[Pyrr] [C_nH_（2n + 1）COO]，n = 5-8。进行这项研究是为了研究离子的分子结构对水溶液中离子电导率的影响。水溶液的离子电导率比纯PIL的电导率高2-30倍。电导率的最大值从ww = 0.41到0.74不等，并且与阳离子和阴离子的性质有关。然后确定（PIL +水）溶液的摩尔电导和无限稀释时的摩尔电导。使用Nernst-Haskell方程，原始方程式和改进的Wilke-Chang方程，可以计算出在无限稀释和298.15 K时水中十二种质子离子液体的自扩散系数。这些计算表明，使用改进的Wilke-Chang和Nernst-Haskell方程可获得相似的值。最后，通过使用Stokes-Einstein方程确定PIL的有效流体动力学（或Stokes）半径。建立线性关系以便在吡咯烷鎓烷基羧酸盐PIL的情况下预测该半径与阴离子烷基链长度的关系。

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