Affectability of ceramic nanoparticles of different compound from surface characteristics in AC electrophoretic deposition

Surface characteristic of particles is one of the main parameters controlling the properties of deposited layer in electrophoretic deposition. To modify the surface characteristic of particles, one of the methods is the addition of additives to the suspensions of powder-solvent. There are many reports dealing with the effect of surface characteristics of particles on uniformity and pattern of deposited layer which most of them are in the case of using DC electric fields for deposition. In this work, affectability of ceramic particles of different compounds from this factor was investigated in the case of using AC electric field. For this purpose, by the help of coplanar electrodes with an inter electrode gap size of 150 µm, nonuniform AC electric field was applied to the suspensions of TiO2-Acetone and WO3-Acetone in the presence and absence of Polyethylenimine (PEI) as an additive. The results proved that while WO3 nanoparticles tend to fill the gap when additive was not used it shows no tendency to fill it in the presence of PEI, however, TiO2 nanoparticles which leave the gap when additive was not applied, fill it in the presence of PEI.