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Seminarios y Eventos

Seminars and Events

Tesis Doctorales


03 September 2021, 10:30 h. online

EUTECTIC MIXTURES RESULTING FROM DILUTION OF DEEP EUTECTIC SOLVENTS: TOOLS FOR CHARACTERIZATION

Huan Zhang
Bioinspired Materials Group


Supervisor(s): Prof. Francisco del Monte & Dra. Mara Concepcin Gutirrez

This thesis focuses on the research of DESs and its mixtures with different solvents for the determination of its eutectic composition and the dilution range of the so-called solvent-in-DES regime, that is, the dilution of DESs where their intriguing features remain but some of their typical drawbacks (e.g., high viscosity, low electrical conductivity, etc.) are mitigated. Therefore, the knowledge of tools for the prediction (and eventually extending) of the dilution range of the solvent-in-DES regime is obviously of interest. To this aim, differential scanning calorimetry (DSC), 1H nuclear magnetic resonance (NMR) and Brillouin spectroscopies of DES solutions as well as the excess molar volume and the deviation in viscosity (calculated from density and viscosity measurements) of the different mixtures were evaluated. Besides, we analyzed an interesting question that arises for DES dilutions related to if DESs themselves should be considered as a mixture of two components or as a pseudo-component. The different treatment yields different results for the determination of their thermodynamic properties that have been used to understand microscopic structures and solute-solvent interactions between DES components and also to predict the dilution range where DES dilutions can better perform in different applications.

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