Abstract
Electro-optical investigations carried out with fractionated Na-bentonite showed an increase of the electro-optical effect with decreasing particle concentration at constant electrolyte concentration (10 −4 mol dm −3) and particle dimensions. Electric polarizability dependence on the electrolyte concentration is observed. The investigations are carried out in the concentration range 0.005–0.1 g dm −3 Na-bentonite where multiple scattering is negligible. The dependence of the electro-optical effect on the Na-bentonite concentration is not connected with the optics of the system (particles' optical anisotropy, oscillation of the optical functions) or with polarization interaction. The results obtained indicated that the interactions among the particles could be responsible for the observed concentration dependence of the electro-optical effect with disc-like particles in aqueous solutions.
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