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Synergistic effects of cationic gemini 1,4-bis(3-dodecylimidazolium-1-yl) butane bromide (C 12 −4−C 12 )Br 2 and anionic sodium lauryl sulfate (SLS) on the interfacial composition, solubility, and solubilization capacity of the microemulsions were investigated. When the mole fractions of (C 12 −4−C 12 )Br 2 in a (C 12 −4−C 12 )Br 2 and SLS mixture (X (C 12 −4−C 12 )Br 2 ) is in the ranges of 0.7 to 1 and 0 to 0.1, the three-phase microemulsion region appears. The solubilization capacity (SP*) of the microemulsions containing both (C 12 −4−C 12 )Br 2 and SLS surfactants become much greater in contrast to the microemulsions that are either (C 12 −4−C 12 )Br 2 -based or SLS-based. The solubilization capacity (SP*) reaches a peak value at X (C 12 −4−C 12 )Br 2 = 0.7. The effects of oils, NaCl contents, and temperatures, on the oil +(C 12 −4−C 12 )Br 2 + SLS + butan-1-ol + aqueous NaCl microemulsion system's ε−β phase diagrams were also discussed.

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