Critical particle concentration in electrophoretic deposition

The role of particle concentration in electrophoretic deposition (EPD) was investigated with two different suspension systems. The first system consisted of positively charged TiO 2 nanoparticles dispersed in isopropanol with 1 vol% water. The second system consisted of negatively charged polystyren...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2010-03, Vol.30 (5), p.1079-1088
Main Authors: Radice, S., Bradbury, C.R., Michler, J., Mischler, S.
Format: Article
Language:English
Subjects:
Diffusion
Electrochemistry
Suspensions
TiO 2
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Summary:The role of particle concentration in electrophoretic deposition (EPD) was investigated with two different suspension systems. The first system consisted of positively charged TiO 2 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% TiO 2 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.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2009.08.021