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In a recent paper, Voeltzel et al. describe a non-equilibrium molecular dynamic (NEMD) study of the rheological properties of a single ionic liquid over range of temperatures, pressures and shear rates [1]. They also measure the low shear rate viscosity of the same fluid experimentally over a similar temperature and pressure range (Fig. 1). The authors present their NEMD results in log(viscosity) versus log(shear rate) form. This shows classical shearthinning behaviour, in which, for data obtained at a given temperature and pressure, the viscosity is initially constant at low shear rate but decreases above a critical shear rate in an apparently linear fashion on a log/log plot, as shown in Fig. 2 (reproduced as Fig. 1). Interestingly, when the authors apply time–temperature superposition to convert all of their viscosity and shear rate data to reduced values based on a reference state of pressure = 0.1 MPa and temperature = 303 K, all of the data collapse onto a single master curve as shown in Fig. 3 (reproduced as Fig. 2). The authors then best fit the Carreau rheological equation to this collapsed curve;

tribology letters/tribology letter

Comment on: Rheology of an Ionic Liquid with Variable Carreau Exponent: A Full Picture by Molecular Simulation with Experimental Contribution, by Nicolas Voeltzel, Philippe Vergne, Nicolas Fillot, Nathalie Bouscharain, Laurent Joly, Tribology Letters (2016) 64:25