Influence of the AOT Counterion Chemical Structure on the Generation of Organized Systems.,Langmuir

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Influence of the AOT Counterion Chemical Structure on the Generation of Organized Systems.
Langmuir ( IF 3.7 ) Pub Date : 2020-08-22 , DOI: 10.1021/acs.langmuir.0c01575
Cristian M O Lépori ₁ , N Mariano Correa _{2,

3} , Juana J Silber _{2,

3} , R Darío Falcone _{2,

3} , Manuel López-López ₄ , M Luisa Moyá ₅

Affiliation

The impact of the imidazolium counterion structure on the organized systems formed by the surfactant 1,4-bis-2-ethylhexylsulfosuccinate, AOT, both in aqueous solutions and in nonpolar solvents is investigated. With this in mind, we investigated if the ionic liquid-like (IL-like) surfactant 1-ethyl-3-methylimidazolium 1,4-bis-2-ethylhexylsulfosuccinate, emim-AOT, forms direct micelles or vesicles in water. Dynamic light scattering, zeta potential, conductivity, fluorescence spectroscopy, and UV–visible spectroscopy measurements were performed to characterize the organized systems in aqueous solutions. We also studied the self-aggregation of emim-AOT, 1-butyl-3-methylimidazolium 1,4-bis-2-ethylhexylsulfosuccinate, bmim-AOT, and of 1-hexyl-3-methylimidazolium 1,4-bis-2-ethylhexylsulfosuccinate, hmim-AOT, in nonpolar solvents. The results obtained showed that the IL-like surfactant emim-AOT forms direct micelles in water, as sodium 1,4-bis-2-ethylhexylsulfosuccinate (Na-AOT) does. However, emim-AOT aggregates are larger, have a lower surface charge, are more stable, and have a more polar and less fluid micellar interface than Na-AOT micelles. It was also observed that emim-AOT and hmim-AOT form reverse micelles in nonpolar solvents. The size of the imidazolium cations dramatically influences the size of the reverse micelles and their ability to solubilize water.

中文翻译：

AOT抗衡离子化学结构对有组织系统生成的影响。

研究了咪唑鎓抗衡离子结构对由水溶液和非极性溶剂中的表面活性剂1,4-双-2-乙基己基磺基琥珀酸酯AOT形成的有组织体系的影响。考虑到这一点，我们研究了离子液体状（IL状）表面活性剂1，4-双-2-乙基己基磺基琥珀酸1-乙基-3-甲基咪唑鎓emim-AOT是否在水中形成直接的胶束或囊泡。进行了动态光散射，ζ电位，电导率，荧光光谱和紫外可见光谱测量，以表征水溶液中的有组织系统。我们还研究了emim-AOT，1-丁基-3-甲基咪唑鎓1,4-双-2-乙基己基磺基琥珀酸酯，bmim-AOT和1-己基-3-甲基咪唑鎓1,4-双-2-的自聚集在非极性溶剂中的乙基己基磺基琥珀酸酯hmim-AOT。获得的结果表明，IL样表面活性剂emim-AOT在水中形成直接胶束，就像1,4-双-2-乙基己基磺基琥珀酸钠（Na-AOT）一样。但是，与Na-AOT胶束相比，emim-AOT胶束更大，表面电荷更低，更稳定，极性更大，流体胶束界面更小。还观察到emim-AOT和hmim-AOT在非极性溶剂中形成反胶束。咪唑阳离子的大小显着影响反胶束的大小及其溶解水的能力。还观察到emim-AOT和hmim-AOT在非极性溶剂中形成反胶束。咪唑阳离子的大小显着影响反胶束的大小及其溶解水的能力。还观察到emim-AOT和hmim-AOT在非极性溶剂中形成反胶束。咪唑阳离子的大小显着影响反胶束的大小及其溶解水的能力。

更新日期：2020-09-15

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