3.3. Refractive Index. The experimental data of nD for the
three binary systems at temperatures T = (293.15, 303.15, and
313.15) K and pressure p = 0.1 MPa are presented in Table S5
of the Supporting Information. The results show that the values
of refractive index become larger with increasing mole fraction
of 1,1′-bicyclohexyl in the binary mixtures, while those become
slightly smaller with the rise of temperature. The trends can be
seen from Figure 5.
The refractive index deviation (ΔnD) is calculated from the
following equation: