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Title: Dielectric behaviour of aprotic polar liquid dissolved in non-polar solvent under static and high frequency electric field
Authors: Sahoo, S
Middya, T R
Sit, S K
Keywords: Double Relaxation Times
Dipole Moment
Issue Date: Mar-2012
Publisher: NISCAIR-CSIR, India
Abstract: Dielectric behaviour of aprotic polar liquids (<i style="">j</i>) like N,N dimethylformamide (DMF), N,N dimethylacetamide (DMA) and acetone (Ac) has been studied under static as well as 9.987, 9.88 and 9.174 GHz electric field employing Debye theory of polar-non polar liquid mixture in terms of measured <i style="">ε</i>'<i style=""><sub>ij</sub></i> and imaginary <i style="">ε</i>"<i style=""><sub>ij</sub></i> part of complex relative permittivity <i style="">ε<sub>ij</sub></i>*, static ε<sub>0ij</sub> and high frequency <i style="">ε</i><sub>∞<i style="">ij</i></sub> for different <i style="">w</i><sub>j</sub>’s of solute dissolved in non polar solvent at 27°C temperature. Double relaxation times τ<sub>2</sub> and τ<sub>1</sub> due to whole molecule and part of the polar molecule have also been estimated analytically using the complex high frequency orientational susceptibility <i style=""><img src='/image/spc_char/lembda.gif' border=0><sub>ij</sub></i>* (=<i style=""> ε<sub>ij</sub>*</i><i style="">-ε</i><sub>∞<i style="">ij</i></sub>) from measured data for DMF and DMA in C<sub>6</sub>H<sub>6</sub> and CCl<sub>4</sub> as well as acetone in C<sub>6</sub>H<sub>6</sub> and CCl<sub>4</sub> solvent, respectively at 27°C. Out of the six systems, three systems show double relaxation time τ<sub>2</sub> and τ<sub>1</sub> and dipole moment μ<sub>2</sub> and μ<sub>1</sub>. The estimated μ’s and <i style="">τ</i>’s agree excellently well with the reported and measured values from ratio of slope and linear slope method. The dipole moments μ<sub>0s</sub>’s in static electric field are also compared with <i style="">μ<sub>j</sub></i>’s in <i style="">hf </i>method. The relative contributions <i style="">c</i><sub>1</sub> and <i style="">c</i><sub>2</sub> due to <i style="">τ</i><sub>1</sub> and τ<sub>2</sub> have been calculated from Fröhlich equation as well as graphical plot of <img src='/image/spc_char/lembda.gif' border=0>'<sub>ij</sub>/<img src='/image/spc_char/lembda.gif' border=0><sub>0ij</sub> -w<sub>j</sub> and <img src='/image/spc_char/lembda.gif' border=0>''<sub>ij</sub>/<img src='/image/spc_char/lembda.gif' border=0><sub>0ij</sub> -w<sub>j</sub> curve at <i style="">w</i><sub>j</sub>→0. Solute-solute and solute-solvent molecular associations are ascertained in different molecular environment.
Description: 175-183
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.50(03) [March 2012]

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