[en] The stability of a fumed aluminium oxide nano powder suspended in water has been assessed through measurement of zeta potential and streaming current, using the fact that the particles exhibit maximum repulsion at high magnitude of charge. Two commercial dispersants belonging to a Dolapix series have been tested. Dolapix CE 64 has shown a better deflocculating action than Dolapix A 88. The iso electric point of the powder suspension has been found close to pH 9. A notable shift in the pH of iso electric point when Dolapix CE 64 was present, indicating that the interaction between particles and dispersant has involved chemical sorption. It has been found out, that at the relative low solids loading studied and within the limits of the pH measurement accuracy, a dispersant supplied in dose levels from 12 to 24 mg/g, has confined the pHiep to a relatively narrow range. A capillary suction time technique has been tried for evaluation of suspension fluidity as function of dispersant concentration and pH. For the dispersant stabilised suspensions, a correlation between their CST and pHiep has been documented
Disciplines :
Materials science & engineering
Author, co-author :
Gaydardzhiev, Stoyan ; Université de Liège - ULiège > Département Argenco : Secteur GeMMe > Traitement et recyclage des matières minérales
Ay, Peter
Language :
English
Title :
Characterisation of aqueous suspensions of fumed aluminium oxide in presence of two Dolapix dispersants
Publication date :
2006
Journal title :
Journal of Materials Science
ISSN :
0022-2461
eISSN :
1573-4803
Publisher :
Springer Science & Business Media B.V., Dordrecht, Netherlands
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