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Dielectric Dispersion and Electric Relaxation Processes Induced by Ionic Conduction in Formamide, 2-Aminoethanol and Their Binary Mixtures

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Abstract

The complex dielectric permittivity, ionic conductivity, electric modulus and impedance spectra of the dipolar molecules formamide (FA), 2-aminoethanol (AE) and their binary mixtures were investigated in the frequency range from 20 Hz to 1 MHz at 303.15 K. Debye-type distributions of the frequency dependent electric modulus and complex impedance were found, corresponding to an ionic conduction relaxation process in the upper frequency regime of the spectra, whereas a spike in the impedance spectra at low frequencies confirms the contribution of an electrode polarization (EP) relaxation process induced by ionic conduction. Due to the high static permittivity of FA, its ionic conductivity was found more than one order of magnitude higher than that of the AE, which is also shown by the comparative values of their EP and ionic conductivity relaxation times. The dependences of dc ionic conductivity values of the binary mixtures on their relaxation times and static permittivity were explored. The concentration dependent static permittivity and the relaxation times led us to infer the formation of a 1:1 H-bonded stable complex between FA and AE molecules with reduction in the number of effective parallel-aligned dipoles.

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Acknowledgments

The authors are grateful to the Department of Science and Technology, New Delhi, for providing financial assistance through research projects No. SR/S2/CMP-09/2002 and SR/S2/CMP-0072/2010.

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Authors and Affiliations

  1. Dielectric Research Laboratory, Department of Physics, J.N.V. University, Jodhpur, 342005, India

    R. J. Sengwa & Shobhna Choudhary

  2. Department of Physical Chemistry of Solutions, University of Łódź, Pomorska 163, 90-236, Lodz, Poland

    Adam Bald

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Correspondence to R. J. Sengwa.

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Sengwa, R.J., Choudhary, S. & Bald, A. Dielectric Dispersion and Electric Relaxation Processes Induced by Ionic Conduction in Formamide, 2-Aminoethanol and Their Binary Mixtures. J Solution Chem 42, 1960–1975 (2013). https://doi.org/10.1007/s10953-013-0087-6

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