RT info:eu-repo/semantics/article
T1 Beyond the blend: Unveiling the thermophysical fingerprints of hydrated choline chloride deep eutectic systems with bio-derived and synthetic hydrogen bond donors
A1 Alcalde García, Rafael T.
A1 Huerta Sainz, Sergio de la
A1 Diez Cabanes, Valentin
A1 Escobedo Monge, María Antonieta
A1 Trenzado, José Luis
A1 Atilhan, Mert
A1 Bol Arreba, Alfredo
A1 Aparicio Martínez, Santiago
K1 Deep eutectic solvents
K1 Thermophysical properties
K1 Choline chloride
K1 Hydration effects
K1 Bio-based hydrogen bond donors
K1 Química física
K1 Chemistry, Physical and theoretical
K1 Disolventes
K1 Solvents
AB This study presents a comprehensive thermophysical characterization of hydrated deep eutectic solvents (DESs) composed of choline chloride (ChCl) and four hydrogen bond donors (HBDs): citric acid, malic acid, fructose, and ethylene glycol in equimolar ratios. By introducing 2, 10, and 22 wt% water—spanning key hydration regimes where DESs structure is progressively altered—we systematically quantify the effects of hydration on density, viscosity, electrical conductivity, thermal conductivity, and refractive index over a wide temperature range. Results demonstrate that water addition leads to a dramatic reduction in viscosity, particularly for bio-derived HBDs, enhancing processability and enabling practical applications. The ChCl:citric acid DESs maintains high structural cohesion upon hydration, reflected in persistent cooperative dynamics and high activation energy, whereas the synthetic ethylene glycol system exhibits predictable, tunable behavior, ideal for engineered fluid systems. Electrical conductivity increases non-linearly with water content, accompanied by a transition from fragile to strong liquid behavior. Derived parameters—molecular volume, thermal expansion coefficient, and excess molar volumes—reveal non-ideal mixing behavior and structural reorganization. Our findings define structure–property correlations critical for optimizing DESs formulations, offering a foundation for application-specific solvent engineering in energy, electrochemistry, and separation technologies.
PB Elsevier
SN 0167-7322
YR 2025
FD 2025-11
LK https://hdl.handle.net/10259/11437
UL https://hdl.handle.net/10259/11437
LA eng
NO This research was funded by European Union (Horizon 2020 program, project WORLD: H2020-MSCA-RISE-2019-WORLD-GA-873005), and Agencia Estatal de Investigación (Project NADESforPFAS: PID2022-142405OB-I00).
DS Repositorio Institucional de la Universidad de Burgos
RD 09-may-2026