Microemulsions were formulated with the ionic liquid ethylammonium nitrate (EAN) used instead of water as the polar phase, hydrocarbon solvents ( n -alkanes) and sugar-based non-ionic surfactants, and their phase behaviour and microstructure were investigated. The sugar-based non-ionic surfactants used are non-toxic, biodegradable and environmentally friendly. Due to these properties, their use in microemulsion systems is a clear alternative to the conventionally used non-ionic surfactants from the class of alkyl polyoxyethylene ethers (C i E j ). The influence of n -alkanes with different chain lengths and of sugar-based nonionic surfactants with hydrophobic chains of different lengths on the microemulsion system was also investigated. The results obtained for the microemulsions with EAN described here are similar to those obtained for microemulsion systems formulated with water as the polar solvent. Liquid crystalline ( LC ) phases were observed in microemulsion systems with sugar-based nonionic surfactants having longer hydrocarbon chains, at lower temperatures and higher surfactant mass fraction.

中文翻译：

---

硝酸乙铵 (EAN)/糖表面活性剂微乳液的相研究：烷烃链长和非离子表面活性剂疏水链长度的影响

以离子液体硝酸乙基铵（EAN）代替水为极性相，烃类溶剂（正构烷烃）和糖基非离子表面活性剂配制微乳液，研究了它们的相行为和微观结构。所使用的糖基非离子表面活性剂无毒、可生物降解和环保。由于这些特性，它们在微乳液体系中的使用明显替代了来自烷基聚氧乙烯醚类（C i E j ）的常规使用的非离子表面活性剂。还研究了具有不同链长的正构烷烃和具有不同长度疏水链的糖基非离子表面活性剂对微乳液体系的影响。此处描述的使用 EAN 的微乳液获得的结果与使用水作为极性溶剂配制的微乳液系统获得的结果相似。在具有较长烃链、较低温度和较高表面活性剂质量分数的糖基非离子表面活性剂的微乳液体系中观察到液晶 (LC) 相。