Electrophoretic deposition of silver from organic PDADMAC-stabilized suspensions
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This study on the electrophoretic deposition (EPD) of silver particles illustrates the influence of the electric field strength on the surface morphology of the deposit. Experiments were performed in ethanol- and methylethylketone (MEK)-suspensions under a direct electric field ranging from 50 to 360 V/cm. The charging agent PDADMAC (poly-(diallyldimethyl)-ammonium-chloride) proved to have a good electrostatic stabilizing effect in both systems and led to a positive zeta-potential in EtOH and to negatively charged particles in MEK. The yield of the deposits showed a linear relation with electric field strength which agrees with Hamakers law for the kinetic of EPD. Layers deposited at low electric field strengths exhibited a smooth and plane surface. Values higher than 180 V/cm resulted in the formation of parallel grooves. The morphology changed again at fields exceeding 360 V/cm and exhibited irregularly distributed hillocks.
KeywordsEtOH Electric Field Strength Silver Particle Electrophoretic Deposition Silver Powder
This work was supported by EPCOS OHG, Deutschlandsberg, Austria.
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