Interfacial tension between (CO₂ + N₂) gas and tetrabutylammonium bromide aqueous solution

This paper reports experimental values of the interfacial tension between (CO₂ + N₂) gas and tetrabutylammonium bromide aqueous solution (TBAB_aq). The experiments were performed by the pendant drop method in conditions from P = (1.00 to 4.00) MPa, from T = (288.15 to 303.15) K and from w_TBAB = (0.10 to 0.40), where w_TBAB denotes the mass fraction of TBAB in the aqueous solution. The interfacial tension decreased with increasing w_TBAB and pressure. The depletion of the interfacial tension with increasing w_TBAB in the (CO₂ + N₂ + TBAB_aq) system was consistent with that in (CO₂ + TBAB_aq) system. The depletion ratio of the pressure gradient of the interfacial tension caused by the addition of TBAB in (CO₂ + N₂ + water) system was almost the same as that in (CO₂ + water) system. There might be little effect on the interfacial tension caused by the interaction between gases and tetrabutylammonium ions. The temperature dependence of γ was not observed as well as in the (CO₂ + TBAB_aq) system.