Liquid-liquid equilibrium of aqueous two-phase systems formed by non-ionic surfactant (Triton X-165 or Triton X-305) and ionic liquid based on the choline cation (choline bitartrate or choline dihydrogen citrate)
| Autor: | Maria C. Hespanhol, Lohayne Ligya Barbosa Silva, Beatriz de Paula Valverde, Laryssa Lorrany Ribeiro Caires, Gabriel Max Dias Ferreira, Aparecida Barbosa Mageste |
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| Rok vydání: | 2020 |
| Předmět: |
Molar mass
Aqueous solution Chemistry Inorganic chemistry 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Endothermic process Atomic and Molecular Physics and Optics 0104 chemical sciences Electronic Optical and Magnetic Materials chemistry.chemical_compound Pulmonary surfactant Phase (matter) Ionic liquid Materials Chemistry Choline Choline Bitartrate Physical and Theoretical Chemistry 0210 nano-technology Spectroscopy |
| Zdroj: | Journal of Molecular Liquids. 318:114030 |
| ISSN: | 0167-7322 |
| DOI: | 10.1016/j.molliq.2020.114030 |
| Popis: | Liquid-liquid equilibrium data for aqueous two-phase systems (ATPSs) formed by Triton X-165 or Triton X-305 + ionic liquid based on the choline cation (choline bitartrate or choline dihydrogen citrate) + water were obtained at different temperatures (298.2, 313.2, and 328.2 K). The effects of temperature, electrolyte anion, and surfactant on the equilibrium data were evaluated. For all the ATPSs investigated, the upper phase was found to be surfactant-rich and the lower phase was electrolyte-rich. An increase of the biphasic region was observed with increasing temperature, showing that the phase separation process was endothermic and entropically driven. The potential of phase segregation between the different anions studied was in the order bitartrate > dihydrogen citrate, which was attributed to the different capacities of the anions to form hydration complexes and induce a surfactant salting-out effect. The TX-305 surfactant was more efficient in inducing phase segregation, compared to the TX-165 surfactant, indicating that the molar mass/hydrophobicity balance of the surfactant determined the immiscibility region of the ATPS. |
| Databáze: | OpenAIRE |
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