This report concerns electro-optical study of colloid-polyelectrolyte complexes of sodium carboxymethyl cellulose (NaCMC) and gamma-aluminium oxide (γ-Al 2 O 3 ) at pH 6.0 and fixed ionic strength. A frequency plateau shrink and a shift towards lower frequencies were observed after NaCMC adsorption especially near the point of zero charge. The electro-optical effect dependence on electric field strength shows that the coated particles reach full orientation at lower values of the applied

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... c field than particles with the highest charge density, previously investigated. Electrophoretic measurements, used as an additional analysis of the changes in the suspensions, showed particles' charge overcompensation above 1⋅10 −3 g/L NaCMC and a saturation of electrophoretic mobility at the highest investigated concentrations of the polymer.