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Surface tensions σ as a function of temperature T for aqueous solutions containing: (a) 28 mass % MEA and 7% HEIA and (b) 26 mass % MEA and 14% HEIA, respectively, and with different CO2 loadings α0. This work: (a) orange □, α0 = 0; green ○, α0 = 0.275; blue Δ, α0 = 0.55; (b) orange □, α0 = 0; green ○, α0 = 0.285; and blue Δ, α0 = 0.57.
