Abstract
Stability of concentrated aqueous colloidal alumina powder suspensions with and without dispersant (albumin and dibasic ammonium citrate (DAC)) has been investigated by measuring surface charge at different solids loading and pH values. The iso-electric point (iep) of alumina powder was found to be pH iep=8.5. The surface charge of alumina powder changed significantly with anionic polyelectrolyte and iep shifted towards more acidic pH range under different dispersion conditions. The study illustrated that albumin is more effective as dispersant than DAC at all solid loading conditions. The computed specific interaction energies −Δ G SP 0 of albumin (7.5) and DAC (3.5) indicate strong adsorption of albumin compared to DAC on alumina powder surface, leading to higher solid loading.
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