(211c) Modeling the Dynamic Viscosity of Ionic Liquids

A newly developed thermodynamic model for the accurate correlation and/or prediction of the dynamic viscosity of ionic liquids is discussed here. The viscosity model is based on the Eyring's absolute rate theory for pure liquids where the activation energy for viscous flow was related to well-known thermodynamic quantities readily obtained from simple cubic equations of state of the van der Waals type. The resulting model was successfully validated during the representation of experimental dynamic viscosities of various imidazolium- and pyridinium-based ionic liquids within a wide temperature range and at atmospheric pressure. Model viscosity extrapolations at higher pressures were also verified.