# The following equation was used

The following equation was used for the correlation between surface tension and temperature.

equation(3)σ/(mNm−1)=A2−A3T,σ/mNm−1=A2−A3T,where σ is the surface tension, A2 and A3 are fitting coefficients, and T is the temperature. The standard deviations (SD) and values of A2, and A3 along with regression coefficient (R2) are tabulated in Table 2 in supporting information.

The surface tension values can be used to calculate the surface EPZ-6438 (Sa) and the surface enthalpy (Es) of ILs from Eqs. (4) and (5), where γ is surface tension and T is the temperature [4] and [22].