Dielectric relaxation in water-dimethylaminoethanol mixtures as a function of composition and temperature

Using Time Domain Reflectometry, the complex dielectric spectra over the frequency range 10 MHz to 20 GHz has been measured in the whole composition range at 288 K, 298 K, 308 K and 318 K for the binary mixtures of water and Dimethylaminoethanol. A systematic variation is observed in dielectric cons...

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Bibliographic Details
Published in:Integrated ferroelectrics 2017-11, Vol.185 (1), p.1-10
Main Authors: Jadhavpatil, V. L., Undre, P. B., Helambe, S. N.
Format: Article
Language:English
Subjects:
Activation energy
Binary mixtures
Chemical bonds
Correlation factor
Dielectric relaxation
Enthalpy
Entropy of activation
excess properties
Free energy
Gibbs free energy
hydrogen bonding
Kirkwood correlation factor
Molecular rotation
Permittivity
Reflectometry
Relaxation time
TDR
thermodynamic parameters
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Summary:Using Time Domain Reflectometry, the complex dielectric spectra over the frequency range 10 MHz to 20 GHz has been measured in the whole composition range at 288 K, 298 K, 308 K and 318 K for the binary mixtures of water and Dimethylaminoethanol. A systematic variation is observed in dielectric constant (ϵ 0 ) and relaxation time (τ). The excess dielectric constant (ϵ E ), excess inverse relaxation time (1/τ) E , Kirkwood correlation factor (g), enthalpy of activation (ΔH), entropy of activation (ΔS) and Gibbs free energy of activation (ΔG) have been determined, to confirm the formation of hydrogen bonded homogeneous and heterogeneous cooperative domains, the dynamics of solute-solute interaction and the hindrance to molecular rotation in the hydrogen bonded water-Dimethylaminoethanol system.
ISSN:1058-4587
1607-8489
DOI:10.1080/10584587.2017.1370264