• Relaxation phenomena of polar non-polar liquid mixtures under low and high frequency electric field

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      https://www.ias.ac.in/article/fulltext/pram/061/04/0759-0772

    • Keywords

       

      Relaxation time; hf conductivity; dipole moment

    • Abstract

       

      Simultaneous calculation of the dipole moment μj and the relaxation time τj of a certain number of non-spherical rigid aliphatic polar liquid molecules (j) in non-polar solvents (i) under 9.8 GHz electric field is possible from real ε′ij and imaginary ε″ij parts of the complex relative permittivity ε*ij. The low frequency and infinite frequency permittivities ε0ij and ε∞ij measured by Purohitet al [1,2] and Srivastava and Srivastava [3] at 25, 35 and 30°C respectively are used to obtain static μs. The ratio of the individual slopes of imaginary σ″ij and real σ′ij parts of high frequency (hf) complex conductivity σ*ij with weight fractionswjatwj → 0 and the slopes of σ″ij— σ′ij curves for differentwjs [4] are employed to obtain τjs. The former method is better in comparison to the existing one as it eliminates polar-polar interaction. The hf μjs in Coulomb metre (C m) when compared with static and reported μs indicate that μs s favour the monomer formations which combine to form dimers in the hf electric field. The comparison among μs shows that a part of the molecule is rotating under X-band electric field [5]. The theoretical μtheos from available bond angles and bond moments of the substituent polar groups attached to the parent molecules differ from the measured μjs and μs to establish the possible existence of mesomeric, inductive and electromeric effects in polar liquid molecules.

    • Author Affiliations

       

      K Dutta1 S K Sit1 S Acharyya1

      1. Department of Physics, Raiganj College (University College), P.O. Raiganj, Dist. Uttar Dinajpur - 733 134, India
    • Dates

       
  • Pramana – Journal of Physics | News

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