A new SAIL, [P4441][DS], has been synthesized and characterized.
[P4441][DS] shows better capacity to reduce water/air interfacial tension than SDS.
Winsor type III phase behavior with water or brine and n-dodecane obtained.
Optimal salinity of ∼8 wt% NaCl leads to minimum interfacial tension of ∼0.08 mN m−1.