Temperature-dependent dielectric characterisation and molecular interaction behaviour in binary mixtures of dimethylacetamide with ethylene glycol and dimethylsulphoxide

Dielectric relaxation measurements on binary mixtures of dimethylacetamide with ethylene glycol and dimethylsulphoxide have been carried out at 11 concentrations using time domain reflectometry technique at 10°C, 20°C, 30°C and 40°C over the frequency range from 10 MHz to 10 GHz. For all the mixture...

Full description

Saved in:
Bibliographic Details
Published in:Physics and chemistry of liquids 2012-09, Vol.50 (5), p.637-651
Main Authors: Undre, P.B., Khirade, P.W., Rajenimbalkar, V.S., Helambe, S.N., Mehrotra, S.C.
Format: Article
Language:English
Subjects:
Activation energy
Binary mixtures
dielectric relaxation
Dynamical systems
Dynamics
Ethylene glycol
excess parameters
Frequency ranges
Kirkwood correlation factor
Mathematical models
Relaxation time
thermodynamic parameters
time domain reflectometry
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Dielectric relaxation measurements on binary mixtures of dimethylacetamide with ethylene glycol and dimethylsulphoxide have been carried out at 11 concentrations using time domain reflectometry technique at 10°C, 20°C, 30°C and 40°C over the frequency range from 10 MHz to 10 GHz. For all the mixtures, only one dielectric loss peak is observed in this frequency range. The relaxation in these mixtures can be described by a single relaxation time using the Debye model. A systematic variation is observed in dielectric constant and relaxation time. Excess permittivity, excess inverse relaxation time, Kirkwood correlation factor and thermodynamic parameters such as enthalpy of activation and Gibbs free energy of activation have been determined, to confirm the formation of hydrogen-bonded homogeneous and heterogeneous cooperative domains, the dynamics of solute-solvent interaction and the hindrance to molecular rotation in the hydrogen-bonded glass forming ethylene glycol-dimethylacetamide and dimethylsulphoxide-dimethylacetamide system.
ISSN:0031-9104
1029-0451
DOI:10.1080/00319104.2011.646443