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|Title:||Relaxation phenomena in methyl benzenes and ketones from ultra high frequency conductivity|
Sit, S K
|Abstract:||The relaxation time τ and dipole moment μ of some methyl benzenes and ketones (i) in a non-polar solvent benzene (i) at 25 °C under 9.585 GHz electric field have been obtained from the measured real and imaginary parts εij’and εij’’of hf complex relative permittivity εij’’ at various weight fractions wj's of a polar liquid. The methodology to get τ from the ratio of the individual slopes of real σij (=wε0εij’’) and imaginary σij’’ (=wε0εij’) parts of complex hf conductivity σij curve against wj's, seems to be a significant improvement over the existing one like the linear slope of σij’’- σij’ curve. The variation of σij - wj curve like σij’’- wj curve is often convex indicating the probable occurrence of phase change in the polar-nonpolar liquid mixture after a certain concentration. The convex nature of σij’’- wj for some systems indicate the maximum absorption of the electric energy unlike other systems. The estimated μ's from slope β of hf conductivity σij - wj curve and τ from both the methods are compared with the work of Gopalakrishna to establish the applicability of the methods. Theoretical dipole moments μtheo's from available bond angles and bond moments are calculated by considering inductive, mesomeric and electromeric effects of the substituent polar groups of the molecules.|
|ISSN:||0975-1041 (Online); 0019-5596 (Print)|
|Appears in Collections:||IJPAP Vol.40(08) [August 2002]|
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