Dielectric Response of Different Alcohols in Water-Rich Binary Mixtures from THz Ellipsometry.
Int J Mol Sci
; 25(8)2024 Apr 11.
Article
en En
| MEDLINE
| ID: mdl-38673827
ABSTRACT
We report a study on the hydrogen bonding mechanisms of three aliphatic alcohols (2-propanol, methanol, and ethanol) and one diol (ethylene glycol) in water solution using a time-domain ellipsometer in the THz region. The dielectric response of the pure liquids is nicely modeled by the generalized Debye-Lorentz equation. For binary mixtures, we analyze the data using a modified effective Debye model, which considers H-bond rupture and reformation dynamics and the motion of the alkyl chains and of the OH groups. We focus on the properties of the water-rich region, finding anomalous behavior in the absorption properties at very low solute molar concentrations. These results, first observed in the THz region, are in line with previous findings from different experiments and can be explained by taking into account the amphiphilic nature of the alcohol molecules.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Agua
/
Alcoholes
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Enlace de Hidrógeno
Idioma:
En
Revista:
Int J Mol Sci
Año:
2024
Tipo del documento:
Article
País de afiliación:
Italia