The effects of carboxylic acids on the aqueous dispersion and electrophoretic deposition of ZrO2

The agglomeration, electrokinetic properties and electrophoretic deposition behaviour of aqueous suspensions of ZrO2 with carboxylic acid additives were studied and compared with conventional pH adjustment. Citric acid gave negative zeta-potential values and electrosteric stabilisation to the partic...

Full description

Saved in:
Bibliographic Details
Published in:Journal of the European Ceramic Society 2012-01, Vol.32 (1), p.235-244
Main Authors: Hanaor, D, Michelazzi, M, Leonelli, C, Sorrell, C C
Format: Article
Language:English
Subjects:
Carboxylic acids
Citric acid
EDTA
Electrophoretic deposition
Oxalic acid
Surface chemistry
Zirconium dioxide
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The agglomeration, electrokinetic properties and electrophoretic deposition behaviour of aqueous suspensions of ZrO2 with carboxylic acid additives were studied and compared with conventional pH adjustment. Citric acid gave negative zeta-potential values and electrosteric stabilisation to the particles in suspensions at all pH levels. Additions of carboxylic acids to the ZrO2 suspensions caused a sharp drop in the zeta-potential at distinct addition levels, which corresponded to surface saturation of the particles with negatively charged carboxylate groups. Adsorption cross sections of citric acid, EDTA and oxalic acid were evaluated from these results, showing that both citric acid and EDTA were coordinated to the ZrO2 surfaces by two carboxylate groups while oxalic acid was coordinated by one group. The use of carboxylic acids resulted in improved electrophoretic deposition in comparison with zeta-potential modification by conventional pH adjustment through improved suspension stability.
ISSN:0955-2219
DOI:10.1016/j.jeurceramsoc.2011.08.015