2.2. Methods. The densities (ρ) are measured by a digital
vibrating glass tube densitometer (Anton Paar, model DMA
5000M, Wundshuh, Austria) at temperature T = (293.15 to
318.15) K and pressure p = 0.1 MPa. The repeatability of
density measurements is less than ± 0.00005 g·cm−3.
The dynamic viscosities (η) are measured with a falling ball
viscometer (Anton Paar, model AMVn) at temperature T =
(293.15 to 318.15) K and pressure p = 0.1 MPa. The precision
of the efflux time is ± 0.001 s. The combined uncertainty of the
viscosity measurement is ± 0.005 mPa·s.