Critical viscosity near the liquid–liquid phase transition in the solution of the ionic liquid1-methyl-3-hexylimidazolium tetrafluoroborate in 1-pentanol
Literature Information
Monika Wagner, Olimpiu Stanga, Wolffram Schröer
In this work, we report measurements of viscosity and density near the liquid–liquid phase transition of the binary solution of the room temperature ionic liquid (RTIL) 1-methyl-3-hexylimidazolium tetrafluoroborate (C6mim+BF4−) in 1-pentanol. The density and the shear viscosity have been determined as function of the temperature and of the concentration. The critical point is located at the temperature Tc = 314.91 K and the mass fraction wc = 0.31034 of the salt. For the critical concentration, the viscosity measurements yield an enhancement as expected for Ising criticality with a crossover to regular behaviour. The regular background is obtained by interpolation from the measurements at non-critical concentrations. The critical enhancement is well described by the mode-coupling crossover function of Bhattacharjee et al. (Phys. Rev. A, 1981, 24, 1469) .The closed form result of the limiting case qD/qc → 0 matches the data almost perfectly.
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