where ηm, η1, and η2 are the viscosities of the mixture, 1,1′-
bicyclohexyl, and alkylcycloalkane, respectively. The values of
Δη are listed in Table S3 of the Supporting Information.
Δη of each binary system at different temperatures are shown
in Figure 4. It is indicated that all of the Δη values are negative and
the absolute values of Δη decrease with increasing temperature.
The maximum negative values can be observed around the mole
fraction of x1 = 0.6. The above observed phenomena indicate that
the temperature is one of important factors to affect the viscosity
deviations. With the rise of temperature, the dispersion force