Brillouin and NMR spectroscopic studies of aqueous dilutions of malicine: Determining the dilution range for transition from a 'water-in-DES' system to a 'DES-in-water' one
| Autor: | Rafael J. Jiménez-Riobóo, F. del Monte, Maria L. Ferrer, María C. Gutiérrez, María J. Roldán-Ruiz |
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| Rok vydání: | 2019 |
| Předmět: |
Brillouin Spectroscopy
Aqueous solution Serial dilution Chemistry Analytical chemistry 02 engineering and technology Nuclear magnetic resonance spectroscopy 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Atomic and Molecular Physics and Optics 0104 chemical sciences Electronic Optical and Magnetic Materials Dilution Deep eutectic solvent Brillouin zone chemistry.chemical_compound Materials Chemistry Physical and Theoretical Chemistry 0210 nano-technology Spectroscopy Choline chloride |
| Zdroj: | Journal of Molecular Liquids. 284:175-181 |
| ISSN: | 0167-7322 |
| DOI: | 10.1016/j.molliq.2019.03.133 |
| Popis: | Brillouin and NMR spectroscopy were used to explore transitions in the structuring of liquid binary mixtures composed of water and a deep eutectic solvent (DES) known as malicine and composed of malic acid (MA) and choline chloride (ChCl). Malicine/H2O binary mixtures were studied for DES contents ranging from 100 to 40 wt%. Data representation of sound propagation velocities – obtained from Brillouin spectroscopy – versus DES content exhibited two well-differentiated linear regimes above and below ca. 70 DES wt% while transitioning from a “water-in-DES” system to a “DES-in-water” one along with dilution. Two linear regimes intersecting at ca. 70 DES wt% were also observed when representing the self-diffusion coefficients versus malicine contents, with MA and ChCl – and even water – exhibiting nearly identical self-diffusion coefficients for contents above 70 wt%, that diverged for contents below 70 wt%. Interestingly, further insights about this behaviour were provided by spin-lattice relaxation time of MA, also revealing the occurrence of hydrophobic hydration around non-polar moieties as in other aqueous binary mixtures of non-ionic H-bond co-solvents – e.g., DMSO:H2O or dioxane:water. |
| Databáze: | OpenAIRE |
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