Journal
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
Volume 147, Issue 14, Pages 7849-7854Publisher
SPRINGER
DOI: 10.1007/s10973-021-11074-w
Keywords
Water-ethanol; Azeotrope; Microwave heating; Molecular clusters
Funding
- Universita degli Studi di Milano within the CRUI-CARE Agreement
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This study provides simple evidence of a peculiar microwave susceptibility of a water-ethanol mixture with the decamer (EtOH)9•H2O, which suggests a change in the hydrogen bond network and/or intermolecular hydrophobic hydration.
A simple measure of the susceptibility of a substance to microwaves (MW) is the resulting heating rate that depends on its heat capacity, density, starting temperature, MW extinction coefficient at the used MW frequency and distance from the irradiated surface. Water, that is ubiquitous in many products, currently treated with MW, shows a large susceptibility at 2450 MHz MW. This is why water is a suitable reference to rank the MW susceptibility of other compounds. Aqueous solutions are the simplest systems to investigate how the presence of extra compounds can modify (normally, reduce) this property. The present work provides a very simple evidence of a peculiar MW susceptibility of the water-ethanol mixture with azeotropic composition, X-EtOH = 0.90 mol fraction, at temperatures rather below the respective boiling point at ambient pressure. The available literature reports a number of experimental and theoretical investigations that suggest the formation of (EtOH)(n)center dot(H2O)(m) ring clusters that change the hydrogen bond network and/or favor intermolecular hydrophobic hydration. The decamer, (EtOH)(9)center dot H2O, could be responsible for the peculiar MW susceptibility of the azeotropic mixture.
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