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 (F9EG13F9) in aqueous solution. The results showed that adding a small CTAB amount to F9EG13F9 (the molar fraction of CTAB in the mixture (x1) was 0.2) could greatly reduce its critical micelle concentrations (cmc) from 0.408 mmol/L to 0.191 mmol/L. At this x1, the contact angle of the mixture was the minimum (57.7 °) at 100 s on polytetrafluoroethylene film, which was even lower than that of F9EG13F9. Besides, CTAB/F9EG13F9 mixtures possessed better colloidal stability and solubilization ability toward hydrophobic dye (Sudan І) than F9EG13F9. The outstanding performances of binary surfactant mixtures benefited from the non-ideal mixing and strong synergistic effect evidence that CTAB/F9EG13F9 surfactant mixtures could be used in practical applications instead of individual F9EG13F9, thereby reducing the used cost of F9EG13F9.

中文翻译：

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阳离子烃表面活性剂与新型非离子三嵌段短链氟碳表面活性剂混合物对表面活性、润湿性和增溶性的强协同作用

将烃类表面活性剂与氟碳表面活性剂混合使用，仍是提高氟碳表面活性剂的经济效益和性能，扩大其应用范围的重要策略。在此，我们通过将阳离子表面活性剂十六烷基三甲基溴化铵 (CTAB) 与三嵌段非离子短链氟碳表面活性剂 (F9EG13F9) 在水溶液中混合制备了一种新型的碳氢氟碳表面活性剂混合物。结果表明，在F9EG13F9中加入少量CTAB（CTAB在混合物（x1）中的摩尔分数为0.2）可以大大降低其临界胶束浓度（cmc），从0.408 mmol/L降至0.191 mmol/L。在该 x1 处，混合物在 100 s 时在聚四氟乙烯薄膜上的接触角最小（57.7°），甚至低于 F9EG13F9。除了，CTAB/F9EG13F9 混合物比 F9EG13F9 具有更好的胶体稳定性和对疏水染料（苏丹 І）的增溶能力。二元表面活性剂混合物的优异性能得益于不理想的混合和强协同效应证明CTAB/F9EG13F9表面活性剂混合物可用于实际应用而不是单独的F9EG13F9，从而降低F9EG13F9的使用成本。