Structural study of aqueous solutions of tetrahydrofuran and acetone mixtures using dielectric relaxation technique |
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Authors: | A C Kumbharkhane S N Helambe M P Lokhande S Doraiswamy S C Mehrotra |
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Institution: | (1) Department of Physics, Dr. Babasaheb Ambedkar Marathwada University, 431 004 Aurangabad, India;(2) Chemical Physics Group, Tata Institute of Fundamental Research, 400 005 Bombay, India |
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Abstract: | The complex permittivity, static dielectric constant and relaxation time for tetrahydrofuran-water and acetone-water mixtures
have been determined at 0°, 10°, 25° and 35°C using time domain reflectometry technique (TDR). The behaviour of relaxation
time of the mixture shows a maxima for the mixture with 30% of water by volume. This suggests that the tendency to form cluster
between water and solute molecule is maximum for this mixture. The excess permittivity for both tetrahydrofuran-water mixture
and acetone-water mixtures, are found to be negative. The Kirkwood correlation factor has been determined at various concentrations
of water. Static dielectric constant for the mixtures have been fitted well with the modified Bruggeman model. The values
of the Bruggeman parametera for tetrahydrofuran is found to be more than the corresponding value for acetone. |
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Keywords: | Dielectrics microwaves tetrahydrofuran acetone excess permittivity Kirkwood factor |
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