Abstract
Fractal aggregates from γ-Al 2O 3 obtained by flame hydrolysis with different hydrodynamic radius are studied by electric light scattering (rotational) and electrophoresis (translational) electrokinetics. The nonequilibrium, electric surface properties of the aggregates characterized by their electric polarizability are studied. The electric polarizability depends linearly on the aggregates dimensions and decreases with indifferent electrolyte concentration increase tending to a constant value. The aggregate structure (the existence of “inner” counterions in the pore space) could be supposed as responsible for an “internal” electric polarizability, relaxing in the kHz region. The electrophoretic mobilities do not depend on the κa-parameter ( κ −1=thickness of diffuse double layer, a=radius of initial spherical γ-Al 2O 3 particles).
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