Looking at the 'water-in-Deep-Eutectic-Solvent' System
| Autor: | E. Posada, Juan A. Anta, María C. Gutiérrez, Francisco del Monte, Sofia Calero, Salvador R. G. Balestra, Maria L. Ferrer, Rafael M. Madero Castro, Silvia Imberti, Nieves López-Salas, José Manuel Vicent-Luna, Rafael J. Jiménez-Riobóo, María Jesús Roldán |
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| Přispěvatelé: | Center for Computational Energy Research, Computational Materials Physics, Materials Simulation & Modelling, Molecular Simulation & Modelling |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
1h nmr spectroscopy
Materials science General Chemical Engineering 02 engineering and technology Neutron scattering 010402 general chemistry 01 natural sciences System a chemistry.chemical_compound Aqueous dilutions of DESs Local structure rearrangements Environmental Chemistry SDG 7 - Affordable and Clean Energy Eutectic system Range (particle radiation) Aqueous solution H NMR spectroscopy Renewable Energy Sustainability and the Environment Deep eutectic solvents General Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences Deep eutectic solvent Dilution H-bond complexes chemistry Chemical engineering Brillouin spectroscopy Binary liquid mixtures 0210 nano-technology SDG 7 – Betaalbare en schone energie |
| Zdroj: | ACS Sustainable Chemistry and Engineering, 7(21), 17565-17573. American Chemical Society |
| ISSN: | 2168-0485 |
| DOI: | 10.1021/acssuschemeng.9b05096 |
| Popis: | Deep eutectic solvents (DESs) are lately expanding their use to more demanding applications upon aqueous dilution thanks to the preservation of the most appealing properties of the original DESs while overcoming some of their most important drawbacks limiting their performance, like viscosity. Both experimental and theoretical works have studied this dilution regime, the so-called "water-in-DES" system, at near-to stoichiometric amounts to the original DES. Herein, we rather studied the high-dilution range of the "water-in-DES" system looking for enhanced performance because of the interesting properties (a further drop of viscosity) and cost (water is cheap) that it offers. In particular, we found that, in the "water-in-DES" system of a ternary DES composed of resorcinol, urea and choline chloride (e.g., RUChClnW, where n represents mol of water per mole of ternary DES), the tetrahedral structure of water was distorted as a consequence of its incorporation, as an additional hydrogen bond donor or hydrogen bond acceptor, into the hydrogen bond complexes formed among the original DES components. DSC confirmed the formation of a new eutectic, with a melting point below that of its respective components, the original ternary DES and water. This depression in the melting point was also observed in the same regime of reline and malicine aqueous dilutions, thus suggesting the universality of this simple procedure (i.e., water addition to reach the high-dilution range of the "water-in-DES" system) to obtain deeper eutectics eventually providing enhanced performances and lower cost. |
| Databáze: | OpenAIRE |
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