Critical particle concentration in electrophoretic deposition

• Presented at: 3rd International Conference on Electrophoretic Deposition - Fundamental and Applications, Hyogo, JAPAN, Oct, 2008
• Published in: Journal Of The European Ceramic Society, vol. 30, p. 1079-1088
• Publication date: 2010

The role of particle concentration in electrophoretic deposition (EPD) was investigated with two different suspension systems. The first system consisted of positively charged TiO2 nanoparticles dispersed in isopropanol with 1 vol% water. The second system consisted of negatively charged polystyrene (PS) microbeads dispersed in isopropanol. Constant voltage EPD was performed using suspensions with variable particle concentration (0.013-0.43 vol% TiO2 and 0.06-11.4 vol% PS). Threshold concentration values were identified for both systems after EPD at 100 V(250 V cm(-1)) for 1 min. Below these values the deposited mass deviated from the trend dictated by Hamaker's equation. Higher applied voltages and longer deposition times were tested and the results suggested that the threshold concentration did not depend on those parameters. A phenomenological model of particle deposition was proposed, which accounts for the local electrochemical conditions close to the substrate in relation to particle size. (C) 2009 Elsevier Ltd. All rights reserved.

Keywords: Suspensions ; Electrochemistry ; Diffusion ; TiO2

Reference

• EPFL-CONF-172821
• doi:10.1016/j.jeurceramsoc.2009.08.021
• View record in Web of Science

Record created on 2011-12-16, modified on 2017-05-10