Reference : Characterisation of aqueous suspensions of fumed aluminium oxide in presence of two D...
Scientific journals : Article
Engineering, computing & technology : Materials science & engineering
Characterisation of aqueous suspensions of fumed aluminium oxide in presence of two Dolapix dispersants
Gaydardzhiev, Stoyan mailto [Université de Liège - ULiège > Département Argenco : Secteur GeMMe > Traitement et recyclage des matières minérales >]
Ay, Peter [ > > ]
Journal of Materials Science
Springer Science & Business Media B.V.
Yes (verified by ORBi)
The Netherlands
[en] fumed alumina ; suspensions ; electrokinetic properties
[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

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