The changes in the physicochemical properties of a cationic surfactant cetyldimethylethylammonium bromide (CDEABr) on the addition of two ionic liquids, namely, 1-butyl-3-methylimidazolium dicyanamide, [C₄mim][dca], and 1-octyl-3-methylimidazolium chloride, [C₈mim][Cl], were investigated. Different techniques which include conductivity method, fluorometry method, DLS studies, and UV–visible spectroscopy were employed in order to determine various properties like critical micelle concentration, CMC, aggregation number, peak diameter of aggregate micelles, and interaction parameters. [C₈mim][Cl] causes more decrease in CMC and more increase in aggregation number. In the case of [C₈mim][Cl], the presence of octyl chain length helps easy mixed micelle formation with CDEABr, whereas in case of [C₄mim][dca] this does not happen because of the absence of long alkyl chain length. The presence of different alkyl chain lengths of ILs and the mixed micelle formation of [C₈mim][Cl] is responsible for the different behavior towards micellization in aqueous cationic surfactant CDEABr.

Graphical abstract

中文翻译：

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表面活性离子液体对常规表面活性剂胶束化的助溶剂作用的热力学

阳离子表面活性剂十六烷基二甲基乙基溴化铵（CDEABr）在添加两种离子液体即1-丁基-3-甲基咪唑鎓二氰胺，[C ₄ mim] [dca]和1-辛基-3-研究了甲基咪唑氯化物，[C ₈ mim] [Cl]。为了确定各种性质，例如临界胶束浓度，CMC，聚集数，聚集胶束的峰直径和相互作用参数，采用了不同的技术，包括电导率法，荧光法，DLS研究和紫外可见光谱法。[C ₈ mim] [Cl]导致CMC减少更多，聚集数更多增加。在[C ₈mim] [Cl]，辛基链长的存在有助于与CDEABr容易地混合形成胶束，而在[C ₄ mim] [dca]的情况下，由于不存在长烷基链长而不会发生。IL的不同烷基链长度的存在和[C ₈ mim] [Cl]的混合胶束形成是造成水性阳离子表面活性剂CDEABr胶束化行为不同的原因。

图形概要