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Mixing hydrocarbon surfactants with fluorocarbon surfactants is still an important strategy to improve the economic benefits and performances of fluorocarbon surfactants and expand their range of application. Herein, we prepared a novel kind of hydrocarbon-fluorocarbon surfactant mixtures via mixing a cationic surfactant, cetyltrimethylammonium bromide (CTAB), with a tri-block nonionic short-chain fluorocarbon surfactant (F 9 EG 13 F 9 ) in aqueous solution. The results showed that adding a small CTAB amount to F 9 EG 13 F 9  (the molar fraction of CTAB in the mixture ( x  1 ) was 0.2) could greatly reduce its critical micelle concentrations ( cmc ) from 0.408 mmol/L to 0.191 mmol/L. At this  x  1 , the contact angle of the mixture was the minimum (57.7 °) at 100 s on polytetrafluoroethylene film, which was even lower than that of F 9 EG 13 F 9 . Besides, CTAB/F 9 EG 13 F 9  mixtures possessed better colloidal stability and solubilization ability toward hydrophobic dye (Sudan І) than F 9 EG 13 F 9 . The outstanding performances of binary surfactant mixtures benefited from the non-ideal mixing and strong synergistic effect evidence that CTAB/F 9 EG 13 F 9  surfactant mixtures could be used in practical applications instead of individual F 9 EG 13 F 9 , thereby reducing the used cost of F 9 EG 13 F 9 . Graphical abstract

journal of leather science and engineering/journal of leather science and engineering

Strong synergistic effect of cationic hydrocarbon surfactant and novel nonionic tri-block short-chain fluorocarbon surfactant mixtures on surface activity, wettability and solubilization