The Kerr effect in aqueous dispersions of anisotropic and electrically charged latex particles

Francesco Mantegazza, Mario Ettore Giardini, Roberto Piazza, Vittorio Degiorgio

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Static and dynamic electric birefringence measurements are performed on dispersions of electrically charged fluorinated latex spheres. It is shown that the Kerr constant is made up of three contributions: the first depends on the intrinsic and form anisotropy of the particle; the second arises from the presence of a slowly fluctuating electric dipole which should be originated by the statistics of the surface charge distribution, and the third is connected with the cloud of dissociated counter-ions. This latter contribution shows a non-Lorentzian frequency dispersion, and its amplitude is strongly dependent on the particle concentration and on the ionic strength.
Original languageEnglish
Pages (from-to)8683-8696
Number of pages14
JournalJournal of Physics: Condensed Matter
Publication statusPublished - 1992



  • Kerr effect
  • aqueous dispersions
  • anisotropic
  • electrically charged
  • latex particles

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