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The effect of acids and bases on the dispersion and stabilization of ceramic particles in ethanol
YKI – Ytkemiska institutet.
2000 (English)In: Journal of the European Ceramic Society, ISSN 0955-2219, E-ISSN 1873-619X, Vol. 20, 659-665 p.Article in journal (Refereed)
Abstract [en]

The dispersion and stability of alumina, titania, and silicon carbide powders in ethanolic medium have been investigated. An operational pH-scale, pH*, based on an ethanol-based reference electrode, was used to systematize the suspension properties. The electrokinetic behavior was determined as a function of pH*; we obtained isoelectric points in ethanol, pH*iep that differed significantly from the isoelectric points in aqueous media. For SiC, we obtained pH*iep=7.5; for the oxides, we obtained pH*iep=4.4 for Al2O3 and pH*iep=4.2 for TiO2. The isoelectric points were discussed in relation to the dissociation constants of the charge determining reactions at the powder surfaces. We have evaluated the long-term stability of the ethanolic dispersions through settling studies which showed that the primary particle size could be retained for extended times providing that the surface potential and ionic strength were optimized.

Place, publisher, year, edition, pages
2000. Vol. 20, 659-665 p.
Keyword [en]
AlsO3, electrokinetic behaviour, ethanol, SiC, suspensions, TiO2
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-26882OAI: oai:DiVA.org:ri-26882DiVA: diva2:1053885
Note
A1268Available from: 2016-12-08 Created: 2016-12-08Bibliographically approved

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