Abstract
Binary systems of two ionic liquids (ILs), 1-ethylpyridinium methanesulfonate [C2Py][MeSO3] and choline dihydrogen phosphate [Chol][H2PO4], and water have been experimentally studied. Density, viscosity, electrical conductivity and proton activity have been measured at several temperatures covering all the miscibility range. From density data, isobaric coefficient of thermal expansion was calculated to study the volumetric behavior of the mixtures. All volumetric data were fit using polynomial equations. The Vogel–Fulcher–Tamman (VFT) equation accurately describes the temperature dependence of viscosity for all systems. Systems based on [C2Py][MeSO3] are less dense and viscous than those involving [Chol][H2PO4], making [C2Py][MeSO3] more suitable for absorption systems where pumping cost has a significant importance. Electrical conductivity data were adjusted using the Casteel–Amis equation. Similar trends were found for both systems, although ionic conductivity is higher for [C2Py][MeSO3] + H2O mixtures....
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