Article
Influence of the AOT Counterion Chemical Structure on the Generation of Organized Systems
Author/s | Lépori, Cristian M.O.
Correa, N. Mariano Silber, Juana J. Falcone, R. Darío López-López, Manuel Moyá Morán, María Luisa |
Department | Universidad de Sevilla. Departamento de Química Física |
Publication Date | 2020 |
Deposit Date | 2022-05-30 |
Published in |
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Abstract | 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 ... 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. |
Funding agencies | Junta de Andalucía Consejo Nacional de Investigaciones Científicas y Técnicas (Argentina) Universidad Nacional de Río Cuarto Agencia Nacional de Promoción Científica y Técnica (Argentina) |
Project ID. | P12-FQM1105
PIP CONICET 112-2015-0100283 PPI-UNRC 2016- 2018 2020-2024 PICT 2018- 0508 |
Citation | Lépori, C.M.O., Correa, N.M., Silber, J.J., Falcone, R.D., López-López, M. y Moyá Morán, M.L. (2020). Influence of the AOT Counterion Chemical Structure on the Generation of Organized Systems. Langmuir, 36 (36), 10785-10793. |
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