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.
- Kerr effect
- aqueous dispersions
- electrically charged
- latex particles
Mantegazza, F., Giardini, M. E., Piazza, R., & Degiorgio, V. (1992). The Kerr effect in aqueous dispersions of anisotropic and electrically charged latex particles. Journal of Physics: Condensed Matter, 4, 8683-8696. https://doi.org/10.1088/0953-8984/4/45/004