Figure 9.

For NTf₂^–-based ILs coupled with different cations of the imidazolium and pyrrolidinium families, running integrals of the Green–Kubo expression, ⟨ζ(t)⟩_Fit, for the viscosity using the Maginn et al. method⁶⁹ of calculation at 400 K. The most important finding, besides the actual viscosity value derived at a long time in each case, is the time it takes for each of these functions to converge to a flat value. In all cases, not only is the viscosity higher for the pyrrolidinium-based ILs but also the time it takes them to approach asymptotic values is always longer than for the imidazolium ILs.