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IJPAP Vol.46(03) [March 2008] >

Title: Dielectric relaxation studies of binary mixtures of ethyl alcohol and N,N-dimethylacetamide in the benzene solution from microwave absorption data
Authors: Sharma, Vimal
Thakur, Nagesh
Sharma, D R
Rangra, V S
Negi, N S
Keywords: Dielectric relaxation
N, N-dimethylacetamide (DMA)
Energy parameters
Microwave absorption
Issue Date: Mar-2008
Publisher: CSIR
Abstract: The dielectric relaxation studies of different molar concentrations of ethanol in the binary mixtures of ethanol and N, N-dimethylacetamide in benzene solutions have been studied at 9.883 GHz by using standard standing microwave techniques and Gopala Krishna’s [Trans Faraday Soc, 33 (1957) 767] single frequency concentration variation method at different temperatures (25, 30, 35 and 40ºC). It is found that dielectric relaxation time varies non-linearly with the variation in molar concentration of ethanol in the whole concentration range of the binary mixture. The solute-solute and solute-solvent types of molecular associations have been proposed. The energy parameters (ΔHε, ΔFε, ΔSε) for the dielectric relaxation process of binary mixtures containing 50% molar concentration of ethanol have been calculated at the respective given temperatures. Comparison has been made with the corresponding energy parameters for viscous flow process. It is found that the dielectric relaxation process can be treated as the rate process like the viscous flow process.
Page(s): 212-214
ISSN: 0019-5596
Source:IJPAP Vol.46(03) [March 2008]

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