The rheology of concentrated suspensions of depletion-flocculated latex particles

Burns, Janine L., Yan, Yao-de, Jameson, Graeme J. and Biggs, Simon (2003) The rheology of concentrated suspensions of depletion-flocculated latex particles. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 214 1-3: 173-180. doi:10.1016/S0927-7757(02)00388-6

Author Burns, Janine L.
Yan, Yao-de
Jameson, Graeme J.
Biggs, Simon
Title The rheology of concentrated suspensions of depletion-flocculated latex particles
Journal name Colloids and Surfaces A: Physicochemical and Engineering Aspects   Check publisher's open access policy
ISSN 0927-7757
Publication date 2003-03-12
Year available 2002
Sub-type Article (original research)
DOI 10.1016/S0927-7757(02)00388-6
Open Access Status Not yet assessed
Volume 214
Issue 1-3
Start page 173
End page 180
Total pages 8
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Language eng
Abstract The effect of adding non-adsorbing polymer, poly(acrylic acid) (PAA), on the rheological properties of concentrated electrostatically-stabilised polystyrene latex suspensions was investigated. The extrapolated yield stress of the depletion-flocculated suspensions was studied as a function of the concentration and the molecular weight of the free polymer. Specifically, the Bingham yield value was observed to increase with either an increase in the weight fraction of the polymer or through the use of a longer chain polyacid. Unlike the sterically stabilised colloidal suspensions studied in the literature, at high polymer concentrations these charge-stabilised latex particles exhibited plateauing in the yield stress for each polyacid. The energy of separating particles within an aggregate into single units was calculated using the yield stress and average particle co-ordination number. In contrast to what was commonly done in the literature, the latter was not assumed to be constant but estimated from the aggregate mass fractal dimension as obtained from static light scattering techniques. It was found that the separation energy showed similar trends to those in the yield stress with both varying the polymer concentration and molecular weight. These trends also bear remarkable similarities to those in the depth of the secondary potential energy well as measured using atomic force microscopy (AFM).
Keyword Colloids
Depletion flocculation
Fractal dimension
Yield stress
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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