. Author manuscript; available in PMC: 2014 Dec 14.

Published in final edited form as: Fluid Phase Equilib. 2014 Nov 15;381:36–45. doi: 10.1016/j.fluid.2014.08.005

Table 9.

Surface thermodynamic functions of the studied ILs and estimated critical temperatures, using both Eötvös (Eot) [99] and Guggenheim (Gug) [100] empirical equations.

IL	(S^γ ± σ)^a (× 10⁻⁵ J·m⁻²·K⁻¹)	(H^γ ± σ)^a (× 10⁻² J·m⁻²)	(T_c)_Eot (K)	(T_c)_Gug (K)
[N₄₁₁₁][NTf₂]	4.83 ± 0.02	4.76 ± 0.01	1252 ± 7	1134 ± 4
[N₄₄₄₁][NTf₂]	5.68 ± 0.12	4.75 ± 0.04	1002 ± 18	953 ± 14
[S₂₂₁][NTf₂]	4.69 ± 0.07	4.95 ± 0.02	1403 ± 27	1219 ± 13
[S₂₂₂][NTf₂]	5.08 ± 0.03	5.04 ± 0.01	1277 ± 5	1141 ± 4

Expanded uncertainty at a 95% level of confidence.