Effect of Molecular Iodine on the Electrophoretic Properties of Suspensions for Electrophoretic Deposition

The authors explore the electrokinetic properties and electrophoretic deposition (EPD) of non-aqueous suspensions of samarium-doped cerium dioxide Ce_0.8Sm_0.2O_1.9 (SDC) with added molecular iodine at concentrations of 0 to 1 g/L. The study reveals an inversion of zeta potential in the SDC suspension as the concentration of iodine rises. Notable cathodic deposition is observed under EPD conditions in a suspension with 10 g/L of SDC and 1 g/L of added iodine at voltages above the threshold value (6 V), despite a negative zeta potential of −5.9 mV measured electroacoustically. Findings suggest a potential interpretation related to overcompensating for the charge in the suspension, due to high concentrations of co-ions and counterions within a double electric layer (DEL).