Journal article

Heteroaggregation with nanoparticles: effect of particle size ratio on optimum particle dose

PD Yates, GV Franks, S Biggs, GJ Jameson

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | ELSEVIER SCIENCE BV | Published : 2005

Abstract

The addition of silica particles (4.3, 19, 43, 105, and 285 nm) to stable alumina dispersions (310 nm) was found to aggregate the alumina causing the large aggregates to settle out. The oppositely charged silica particles adsorb onto the alumina particle surface resulting in charge neutralisation, bridging and aggregation. The effect of particle size ratio and surface coverage on the amount of silica required to produce the clearest supernatant was investigated. It was found that as the silica particle size increases the number of particles needed for optimum aggregation decreased, although the total amount of silica (wt.%) increased. Below a particle size ratio of about 0.025, the number of..

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University of Melbourne Researchers