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 in comparison with conventional pH adjustment. It was found that citric acid imparted negative zeta-potential values and electrosteric stab...

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Bibliographic Details
Published in:arXiv.org 2013-03
Main Authors: Hanaor, D A H, Michelazzi, M, Leonelli, C, Sorrell, C C
Format: Article
Language:English
Subjects:
Acids
Additives
Carboxylic acids
Charged particles
Citric acid
Electrokinetics
Electrophoretic deposition
Ethylenediaminetetraacetic acids
Oxalic acid
Reagents
Zirconium dioxide
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Summary:The agglomeration, electrokinetic properties and electrophoretic deposition behaviour of aqueous suspensions of ZrO2 with carboxylic acid additives were studied in comparison with conventional pH adjustment. It was found that citric acid imparted negative zeta-potential values and electrosteric stabilisation to particles in suspensions at all pH levels. The examination of additions of carboxylic acids to ZrO2 suspensions revealed that these reagents cause a sharp drop in zeta-potential at distinct addition levels, which correspond 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 coordinate to ZrO2 surfaces by two carboxylate groups while oxalic acid is coordinated by one group. The use of carboxylic acids was shown to facilitate superior electrophoretic deposition in comparison with zeta-potential modification by conventional pH adjustment through improved suspension stability.
ISSN:2331-8422
DOI:10.48550/arxiv.1303.2754