Abstract
The density, viscosity and conductivity of nine commercially available tetra-alkyl phosphonium ionic liquids (ILs) are presented. The effect of cation volume and symmetry, anion volume, and temperature are observed. The Vogel-Tamman- Fulcher (VTF) equation is used to calculate the theoretical glass transition temperature (To) and the activation energy of conductivity Ea,Λ. The conductivity of three halo-aluminate ionic liquid systems for mole fractions up to 0.7 AlCl3 is reported.
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