An analysis of current transients during electrophoretic deposition (EPD) from colloidal TiO2 suspensions

This is a simple quantitative analysis of the electrical current transients recorded during the electrophoretic deposition (EPD) of TiO2 particles from ethanol-based suspensions in which the linear correlation between the mass deposited and the charge passed was verified experimentally. Using this experimental knowledge as our starting point, we were able to test a simple electrical model of a deposition cell for its consistency with electrical current density data measured during EPD. Assuming that the background electrochemistry was controlled resistively rather than diffusively, we then tentatively exploited the electrochemical data to gain information on the structure of the deposit during its growth.

A resistive control of background electrochemistry during electrophoretic deposition of TiO2 is proposed to explain the observed trend of faradic currents. Derived numerical parameters are tentatively used for the structural characterization of the EPD deposit.Figure optionsDownload high-quality image (175 K)Download as PowerPoint slide