Department of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY, UK.
Phys Chem Chem Phys. 2018 May 23;20(20):13952-13961. doi: 10.1039/c8cp01008k.
Micellisation of surfactants in deep eutectic solvents has been recently demonstrated to provide a controllable way to modify micelle morphology. Ion-pair interactions between the solvent and the surfactant headgroup were identified as affecting the micellisation by modifying the charge density of the micelle. Here we explore the micellisation of dodecylsulfate surfactants with different counterions (Li+, Cs+, Mg2+, Bmim+, Emim+, cholinium+) dissolved in two deep eutectic solvents: choline chloride:urea and choline chloride:glycerol. Surface tension results show a solvent and counterion dependence of the CMC of the surfactants. Small-angle neutron scattering was subsequently used to investigate the morphology of the micelles formed. The results show that the elongation of the micelles is strongly dependent on the solvent, showing more elongated aggregates in choline chloride:urea than in choline chloride:glycerol. The morphology of micelles in DES was also found to depend on the counterion, where the affinity of binding showed similarities to that in water.
最近的研究表明，在深共晶溶剂中，表面活性剂的胶束化可以提供一种可控的方法来改变胶束形态。溶剂和表面活性剂头基之间的离子对相互作用被认为通过改变胶束的电荷密度来影响胶束化。在这里，我们研究了不同反离子（Li+、Cs+、Mg2+、Bmim+、Emim+、胆碱+）的十二烷基硫酸盐表面活性剂在两种深共晶溶剂：氯化胆碱：尿素和氯化胆碱：甘油中的胶束化。表面张力结果表明，表面活性剂的 CMC 取决于溶剂和反离子。随后使用小角中子散射研究了形成的胶束的形态。结果表明，胶束的伸长强烈依赖于溶剂，在氯化胆碱：尿素中形成的聚集体比在氯化胆碱：甘油中更细长。还发现 DES 中的胶束形态取决于反离子，其结合亲和力与在水中的相似。
