28. Stabilization of Ethanol Based Ceramic Suspensions for Electrophoretic Deposition

  1. Dongming Zhu and
  2. Kevin Plucknett
  1. Mohan Menon,
  2. Sophie Decouroelle,
  3. Nizar Attia,
  4. Severine Ramousse and
  5. Peter Halvor Larsen

Published Online: 26 MAR 2008

DOI: 10.1002/9780470291238.ch28

Advances in Ceramic Coatings and Ceramic-Metal Systems: Ceramic Engineering and Science Proceedings, Volume 26, Number 3

Advances in Ceramic Coatings and Ceramic-Metal Systems: Ceramic Engineering and Science Proceedings, Volume 26, Number 3

How to Cite

Menon, M., Decouroelle, S., Attia, N., Ramousse, S. and Larsen, P. H. (2005) Stabilization of Ethanol Based Ceramic Suspensions for Electrophoretic Deposition, in Advances in Ceramic Coatings and Ceramic-Metal Systems: Ceramic Engineering and Science Proceedings, Volume 26, Number 3 (eds D. Zhu and K. Plucknett), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291238.ch28

Author Information

  1. Materials Research Department Risø National Laboratory Frederiksborgvej 399, Building 228 Roskilde, DK 4000

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2005

ISBN Information

Print ISBN: 9781574982336

Online ISBN: 9780470291238

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Keywords:

  • electrophoretic;
  • dielectric;
  • polyelectrolyte;
  • viscomter;
  • agglomerates

Summary

Electrophoretic deposition (EPD) is a promising technique for fabrication of supported and unsupported films directly from stabilized suspensions. Al2O3 suspensions in ethanol were prepared using citric acid as a dispersant At an operational pH of 3, citric acid addition resulted in negatively charged Al2O3 particle surfaces. Addition of citric acid before milling of Al2O3 suspension resulted in finer particles and higher magnitude of zeta compared to citric acid addition after milling of A2O3 suspensions. Resulting suspension properties depended also on the citric acid concentration, which could be explained using the Derjaguin-Landau-Verwey-Overbeek (DLVO) theory. Citric acid concentrations between 0.4-0.68 wt% produced stable suspensions with Newtonian behavior, high surface charge, and low viscosities, down to 10 mPa·s for suspensions with 20 vol% solid loading. Citric acid was found to be an excellent dispersant for Al2O3 in ethanol. Solid loading was found to be the most influential variable controlling the deposition rate during EPD, followed by voltage applied, deposition time and the distance between the electrodes.