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The self-assembly of ionic liquids surfactants in ethanolammonium nitrate ionic liquid
Journal of Molecular Liquids ( IF 5.3 ) Pub Date : 2018-01-31 , DOI: 10.1016/j.molliq.2018.01.095
Yuanchao Pei , Lihui Hao , Jie Ru , Yuling Zhao , Huiyong Wang , Guangyue Bai , Jianji Wang

Self-assembly of ionic liquids (ILs) surfactants in ILs solvents is important from the viewpoint of both scientific research and practical application because of the advantages of high ionic nature and possible application at high temperature. In this work, the aggregation behavior of long-chain ionic liquids 1-alkyl-3-methylimidazolium chloride [Cnmim]Cl (n = 12, 14, 16) and N-alkyl-N,N-dimethylethanolammonium [CnDMEA]Cl (n = 12, 14, 16) in a protic ionic liquid, ethanolammonium nitrate (EOAN), is investigated by surface tension measurements. The variation of micellization parameters with alkyl chain length and head group type of the ILs surfactants is analyzed and compared with that in water and in ethylammonium nitrate (EAN). It is found that the critical micelle concentration (cmc) values of the IL surfactants, such as [C12mim]Cl, in EOAN are 27 times smaller than those in EAN, and 4 times smaller than those in water. This suggests that EOAN is a better self-assembly medium for the ILs surfactants. It is also found that the contribution of head groups of the ILs surfactants to the cmc values is different in EOAN, water and EAN, while the contribution of CH2 group in the alkyl chain of the ILs surfactants is generally independent of the solvents nature.



中文翻译:

乙醇硝酸铵离子液体中离子液体表面活性剂的自组装

从科学研究和实际应用的观点来看,离子液体(ILs)表面活性剂在ILs溶剂中的自组装是重要的,因为其具有高离子性质和在高温下的可能应用的优点。在这项工作中,长链离子液体1-烷基-3-甲基咪唑鎓氯化物[C n mim] Cl(n  = 12,14,16)和N-烷基-NN-二甲基乙醇铵[C n通过表面张力测量研究质子离子液体乙醇硝酸铵(EOAN)中的DMEA] Cl(n = 12、14、16)。分析了ILs表面活性剂的胶束化参数随烷基链长和头基类型的变化,并与水和硝酸乙基铵(EAN)中的变化进行了比较。结果发现,EOAN中IL表面活性剂(例如[C 12 mim] Cl )的临界胶束浓度(cmc)值比EAN的值小27倍,比水中的值小4倍。这表明EOAN是ILs表面活性剂的更好的自组装介质。还发现在EOAN,水和EAN中,ILs表面活性剂的头基对cmc值的贡献不同,而CH 2的贡献 ILs表面活性剂的烷基链中的基团通常独立于溶剂的性质。

更新日期:2018-01-31
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