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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 25, Number 9
BKCSDE 25(9)
September 20, 2004 

Microwave Dielectric Characterization of Binary Mixtures of 3-Nitrotoluene with Dimethylacetamide, Dimethylformamide and Dimethylsulphoxide
Ajay Chaudhari*, H. C. Chaudhari, S. C. Mehrotra
Dielectric relaxation, Mixture, Excess properties, Time domain reflectometry
Dielectric relaxation measurements on 3-nitrotoluene (3-NT) mixture of dimethylacetamide (DMA), dimethylformamide (DMF) and dimethysulphoxide (DMSO) have been carried out across the entire concentration range using Time domain reflectometry technique at 15, 25, 35 and 45 oC over the frequency range from 10 MHz to 20 GHz. For all the mixtures, only one dielectric loss peak was observed in this frequency range and the relaxation in these mixtures can be well described by a single relaxation time using Debye model. Bilinear calibration method is used to obtain complex permittivity ε*( ω) from complex reflection coefficient ρ*( ω) over frequency range 10 MHz to 20 GHz. The excess permittivity, excess inverse relaxation time, Kirkwood correlation factor, molar energy of activation are also calculated for these mixtures to study the solute-solvent interaction.
1403 - 1407
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