• Investigation of dielectric relaxation in dipolar liquids from conductivity measurement

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    • Keywords


      Conductivity; relaxation time; dipole moment; penetration depth; dielectric relaxation.

    • Abstract


      Conductivity (σ$_{ijk}$’s) measurement method is proposed to investigate dielectric relaxation in ternary polar–nonpolar mixture of N,N-dimethyl formamide (DMF)(j) with pyridine(k) or acetonitrile(k) dissolved in p-xylene (i) at various weight fractions (w$_{jk}$’s) and temperature under different bands (S, C, X and Ku) of microwave field applying Debye’s dielectric model. Ratio of slopes of imaginary σ$_{ijk}$″ vs. w$_{jk}$ with real σ$_{ijk}$′ vs. w$_{jk}$ of complex conductivity σ$_{ijk}$* as well as linear slope of σ$_{ijk}$″ vs. σ$_{ijk}$′ are used to predict τ$_{jk}$’s (relaxation time) and μ$_{jk}$’s (dipole moments). Variousmolecular associations are also identified from the meaningful interactions among polar–nonpolar molecules in terms of τ$_{jk}$ and μ$_{jk}$. Molecular dynamics or molecular environment surrounding the polar molecules DMF, pyridine or acetonitrileis extensively studied with the help of estimated thermodynamic energy parameters. The existence of Debye relaxation mechanism in polar–nonpolar mixture is authenticated by the estimated Debye factor. Microwave sensor development is also ascertained from various dielectric parameters like permittivity, conductivity and penetration depth under microwave field.

    • Author Affiliations



      1. Department of Electronics and Communication Engineering, National Institute of Technology Jamshedpur, Jamshedpur 831014, India
      2. Department of Physics, Dr. MeghnadSaha Institute of Technology, Haldia 721657, India
    • Dates

  • Bulletin of Materials Science | News

    • Dr Shanti Swarup Bhatnagar for Science and Technology

      Posted on October 12, 2020

      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
      Chemical Sciences 2020

      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
      Physical Sciences 2020

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