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Influence of the Dispersant Structure on Properties of Electrostatically Stabilized Aqueous Alumina Suspensions by Pirmin C. Hidber; Thomas J. Graule; Ludwig J. Gauckler is a Materials Science article available to read on EtoBox.

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A series of molecules based on a benzene ring substituted with (-OH) and (-COOH) groups was used to derive guidelines for the selection of dispersants for a given colloidal forming process. The relation between the molecular structure of Iowmolecular-weight organic dispersants and their in.uence on the properties of a-AlJO suspensions was studied. In particular, the eflect of the nature, number and position of the functional groups attached to the benzene ring on the adsorption behaviour of these molecules on o+A1203 and on the electrophoretic mobility of alumina particles in aqueous suspension has been examined. The eflect of a lowmolecular-weight dispersant is mainly determined by its ability to adsorb on the powder surface and by the number of functional groups that can dissociate and act as surface-charge modtfiers. The maximum degree of adsorption for any given dispersant was found in the pH range corresponding to the pKa value of its functional group. High adsorption ability and high eficiency over a wide pH range could be achieved for a single dispersant by combining several functional groups of deferent pKa values in the same molecule. Adsorption of a dispersant was promote

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Author

Pirmin C. Hidber; Thomas J. Graule; Ludwig J. Gauckler

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0955-2219)

Published

1997

Language

EN

Field

Materials Science (Physical Sciences)