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

Yates, Peter D., Franks, George V., Biggs, Simon and Jameson, Graeme J. (2005) Heteroaggregation with nanoparticles: effect of particle size ratio on optimum particle dose. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 255 1-3: 85-90. doi:10.1016/j.colsurfa.2004.12.035


Author Yates, Peter D.
Franks, George V.
Biggs, Simon
Jameson, Graeme J.
Title Heteroaggregation with nanoparticles: effect of particle size ratio on optimum particle dose
Journal name Colloids and Surfaces A: Physicochemical and Engineering Aspects   Check publisher's open access policy
ISSN 0927-7757
1873-4359
Publication date 2005-03-21
Sub-type Article (original research)
DOI 10.1016/j.colsurfa.2004.12.035
Open Access Status Not yet assessed
Volume 255
Issue 1-3
Start page 85
End page 90
Total pages 6
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Language eng
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 silica particles exceeded the calculated half surface coverage number, while at particle size ratios near 1.0 the number of silica particles needed was only about 25% of that calculated for half surface coverage. The median point of the range of concentrations that produced clear supernatants correlated with zero zeta potential.
Keyword Bridging
Half surface coverage
Heteroaggregation
Nanoparticle
Size ratio
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Faculty of Engineering, Architecture and Information Technology Publications
 
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