2026-08-17T12:12:47Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/114582026-03-03T01:05:38Zcom_10259_9476com_10259.4_106com_10259_2604col_10259_9477

00925njm 22002777a 4500 dc Alcalde García, Rafael T. author Aguilar Cuesta, Nuria author Escobedo Monge, María Antonieta author Trenzado, José Luis author Atilhan, Mert author Bol Arreba, Alfredo author Aparicio Martínez, Santiago author 2024-06 Deep eutectic solvents have gained attention as environmentally friendly alternatives in various technological applications. Likewise, it is known the relevant effect of water on the physicochemical properties of Deep Eutectics, especially for hydrophilic ones. In this study, Betaine – based type III Deep Eutectic solvents (with ethylene glycol, fructose, malic acid or citric acid as Hydrogen Bond Donors) are considered and the properties and structuring of water in Deep Eutectic solutions (content lower than 20 %) were investigated considering volumetric properties, optical properties (refraction index), dynamic properties (viscosity, thermal conductivity, and electrical conductivity) as well as relevant characteristics for liquid phase nature such as polarizability and molecular packing. Viscosity measurements demonstrated a wide variation in viscosities, with water content playing a significant role, thus probing how water content largely affect dynamic properties of Deep Eutectics. Additionally, high water content led to improved thermal and electrical conductivity, particularly in mixtures containing citric acid and malic acid as Hydrogen Bond Donors. The polarizability decreased with increasing water content, and packing calculations indicated that the most voluminous molecules occupied interstitial voids. Our findings contribute to the understanding of water in Deep Eutectics solution, aiding their optimization for sustainable applications. 0167-7322 https://hdl.handle.net/10259/11458 10.1016/J.MOLLIQ.2024.124871 Deep Eutectic Solvents water in DES Physicochemical properties Viscosity, hydrogen bonding Molecular modelling On the properties of water in betaine – based Deep Eutectic Solvents