Institute of Chemistry, University of São Paulo, São Paulo, SP, Brazil.
J Colloid Interface Sci. 2011 Sep 1;361(1):186-94. doi: 10.1016/j.jcis.2011.04.108. Epub 2011 May 10.
The impetus for the increasing interest in studying surface active ionic liquids (SAILs; ionic liquids with long-chain "tails") is the enormous potential for their applications, e.g., in nanotechnology and biomedicine. The progress in these fields rests on understanding the relationship between surfactant structure and solution properties, hence applications. This need has prompted us to extend our previous study on 1-(1-hexadecyl)-3-methylimidazolium chloride to 1-(1-alkyl)-3-methylimidazolium chlorides, with alkyl chains containing 10, 12, and 14 carbons. In addition to investigating relevant micellar properties, we have compared the solution properties of the imidazolium-based surfactants with: 1-(1-alkyl)pyridinium chlorides, and benzyl (2-acylaminoethyl)dimethylammonium chlorides. The former series carries a heterocyclic ring head-group, but does not possess a hydrogen that is as acidic as H2 of the imidazolium ring. The latter series carries an aromatic ring, a quaternary nitrogen and (a hydrogen-bond forming) amide group. The properties of the imidazolium and pyridinium surfactants were determined in the temperature range from 15 to 75°C. The techniques employed were conductivity, isothermal titration calorimetry, and static light scattering. The results showed the important effects of the interactions in the interfacial region on the micellar properties over the temperature range studied.
人们对表面活性离子液体（SAIL；长链“尾巴”的离子液体）的研究兴趣日益浓厚，这主要是因为它们具有巨大的应用潜力，例如在纳米技术和生物医药领域。这些领域的进展取决于对表面活性剂结构与溶液性质之间关系的理解，因此，应用研究也依赖于此。这一需求促使我们将之前对 1-(1-十六烷基)-3-甲基咪唑氯化物的研究扩展到 1-(1-烷基)-3-甲基咪唑氯化物，其中烷基链分别含有 10、12 和 14 个碳原子。除了研究相关的胶束性质外，我们还比较了基于咪唑啉的表面活性剂与：1-(1-烷基)吡啶氯化物和苄基(2-酰氨基乙基)二甲基氯化铵的溶液性质。前者系列带有杂环头基，但不具有像咪唑啉环的 H2 那样酸性的氢。后者系列带有芳环、季氮和（形成氢键的）酰胺基团。在 15 至 75°C 的温度范围内确定了咪唑啉和吡啶表面活性剂的性质。所采用的技术是电导率、等温滴定量热法和静态光散射。结果表明，在研究温度范围内，界面区域相互作用对胶束性质的重要影响。
