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A spherical cavity model for quadrupolar dielectrics.

Iglika M Dimitrova1, Radomir I Slavchov1, Tzanko Ivanov2

  • 1Department of Physical Chemistry, Faculty of Chemistry and Pharmacy, Sofia University, 1164 Sofia, Bulgaria.

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This study extends Onsager

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Area of Science:

  • Physical Chemistry
  • Dielectric Properties
  • Molecular Modeling

Background:

  • Understanding dielectric properties is crucial for fluid behavior.
  • Onsager's model provides a foundation for dielectric studies.
  • Molecular multipole moments influence dielectric responses.

Purpose of the Study:

  • To extend Onsager's dielectric theory to fluids with molecular quadrupoles.
  • To investigate the impact of molecular quadrupoles on dielectric permittivity.
  • To calculate macroscopic quadrupolarizabilities and cavity radii.

Main Methods:

  • Utilized an Onsager-type model with a spherical cavity.
  • Related fluid dielectric permittivity and quadrupole polarizability to molecular characteristics.
  • Analyzed the influence of quadrupole terms on reaction and cavity fields.

Main Results:

  • Molecular quadrupoles have a measurable effect on dielectric permittivity, especially at small cavity sizes.
  • Calculated macroscopic quadrupolarizabilities and cavity radii for various liquids.
  • Cavity radii were found to be density-dependent.

Conclusions:

  • The extended Onsager theory accurately models dielectric properties influenced by molecular quadrupoles.
  • This model is significant for non-polar solutions under varying pressure and temperature.
  • The findings are particularly relevant for applications in fuel and crude oil industries.