Dielectric relaxation studies of aqueous l-glutamine-ethanol mixtures in the microwave frequency range

Abstract A study on the dielectric properties of various molar concentration levels of aqueous l -glutamine, ethanol mixtures at microwave frequency region (0.02  l -glutamine in water, ethanol medium are evaluated. It is noticed that the real and imaginary part of dielectric permittivity increases with increase in molar concentration levels of l -glutamine in water and ethanol medium and decreases with increase in temperature. From these parameters, average relaxation time (τ), excessive inverse relaxation time (1/τ)E, excessive dielectric permittivity (eE) are determined and their behavior is analyzed in terms of the distribution of hydrogen bond network in the liquid medium. The theoretical dipole moments of l -glutamine in both aqueous and ethanol medium are determined by using DFT-B3LYP method with different solvation models. Mean molecular polarizability (αM) of the system is calculated from the Lippincott δ function potential model and compared with the Lefevre method. The activation entropy (ΔS*), activation enthalpy (ΔH*), Helmholtz energy (ΔFE) parameters have also been evaluated and the results are correlated.

• Publication year

  2019

• Venue

  Journal of Molecular Liquids

• Publication date

  2019-11-01

• Fields of study

  Materials Science, Chemistry

• Identifiers
  DOI 10.1016/J.MOLLIQ.2019.111506
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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