Optimized preparation, thermal characterization and microwave absorption properties of deep eutectic solvents made by choline chloride and hydrated salts of alkali earth metals
Year: 2023
Authors: Pelosi C., Gonzalez-Rivera J., Bernazzani L., Tiny MR., Duce C.
Autors Affiliation: Univ Pisa, Dipartimento Chim & Chim Ind, Via Moruzzi 13, I-56124 Pisa, PI, Italy; Ctr Nazl Ric, Ist Nazl Ott INO CNR, Area Pisa, Via Moruzzi, I-56124 Pisa, PI, Italy.
Abstract: In this manuscript, we provided insights into the preparation of Deep Eutectic Solvents (DESs) made by choline chloride and MgCl2 center dot 6H2O or CaCl2 center dot 6H2O, proposed as green solvents for the valorization of biomasses, and we performed an extensive evaluation of their thermal properties. In particular, we highlighted the use of a microwave (MW) coaxial antenna as a rapid, efficient, and eco-friendly heating probe, which can reduce the preparation time up to 40 times with respect to conventional heating without altering the final properties of the product. The thermal properties of the DESs were extensively studied by Differential Scanning Calorimetry and High-Resolution Thermogravimetry with analysis of the evolved gas by Fourier Transformed Infra-Red spectroscopy, with the aim to obtain important information on their thermal stability and thermal degradation mechanism. The experimental data also allowed us to obtain indirect evidence of the hydrogen bonding network formed in DES nanostructures. Finally, the evaluation of the samples’ capability to absorb MWs allowed us to classify them as good MW absorbers, highlighting their potential for future applications in MW-assisted processes.(c) 2022 Elsevier B.V. All rights reserved.
Journal/Review: JOURNAL OF MOLECULAR LIQUIDS
Volume: 371 Pages from: 121104-1 to: 121104-10
KeyWords: Deep eutectic solvents; Microwave -assisted process; Microwave absorption; High -Resolution Thermogravimetry; Thermal stability; Type II DESsDOI: 10.1016/j.molliq.2022.121104ImpactFactor: 5.300Citations: 4data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2024-09-15References taken from IsiWeb of Knowledge: (subscribers only)
