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|Title:||Dielectric relaxation studies of binary mixtures of tetrahydrofuran and N-methylacetamide in benzene solutions using microwave absorption data|
Rangra, V S
Microwave absorption studies
|Abstract:||Using standard standing wave microwave X-band technique and by following Gopala Krishna’s<sup> </sup>single frequency (9.90 GHz) concentration variational method, the dielectric relaxation times (<img src='/image/spc_char/tow.gif'> ) and the dipole moments (<img src='/image/spc_char/micro.gif'> ) of dilute solution of tetrahydrofuran(THF), N-methylacetamide(NMA) and THF+NMA binary mixtures in benzene solutions have been calculated at different temperatures 25°, 30°, 35°<sup> </sup>and 40°C. The energy parameters (<img src='/image/spc_char/delta.gif'><i>H</i><sub>e, </sub><img src='/image/spc_char/delta.gif'><i>F</i><sub>e</sub>, <img src='/image/spc_char/delta.gif'><i>S</i><sub>e</sub>) for the dielectric relaxation process for THF+NMA binary mixture containing 30 mol% THF have been calculated at 25°, 30°, 35° and 40°C and compared with the corresponding viscosity parameters. A good agreement between the free energy of activation from these two sets of values shows that the dielectric relaxation process like the viscous flow process can be treated as the rate process. From relaxation time behaviour of THF and NMA binary mixture in benzene solution, solute-solute types of the molecular association have been proposed.|
|ISSN:||0975-1041 (Online); 0019-5596 (Print)|
|Appears in Collections:||IJPAP Vol.48(06) [June 2010]|
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