Decisive influence of colloidal suspension conductivity during electrophoretic impregnation of porous anodic film supported on 1050 aluminium substrate
Résumé
The present paper studies the influence of suspension conductivity on the electrophoretic deposition
(EPD) of nanoparticles inside a porous anodic aluminium oxide film. It is shown that an increase in the
suspension’s conductivity enhances impregnation of the anodic film by the nanoparticles. Two mechanisms
are seen to promote the migration of particles into the pores. Indeed an increase in the suspension
conductivity leads on the one hand to a strengthening of the electric field in the anodic film and on the
other hand to a thinning of the electric double layer on the pore walls. The results of our study confirm
that colloidal suspension conductivity is a key parameter governing the electrophoretic impregnation
depth.
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