The polymer and salt induced aggregation of silica particles

Tavacoli, J. W. and Dowding, P. J. and Routh, A. F. (2007) The polymer and salt induced aggregation of silica particles. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 293 (1-3). pp. 167-174. DOI 10.1016/j.colsurfa.2006.07.025

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Abstract

Dynamic light scattering (DLS) was used to map the stability of an aqueous silica colloid in the presence of differing concentrations of sodium polystyrene sulphonate (PSS) and sodium chloride (NaCl). Additionally, values of PSS size with salt and PSS osmotic pressure were measured as a function of PSS concentration. Six theoretical maps based on DLVO and simple depletion theory were then constructed as a comparison to the experimental map using the measured values as well as two theoretical values of PSS size and osmotic pressure. It was found that DLVO overestimates the effect of salt screening and of the various comparisons those calculated using size and osmotic pressure derived from a PSS chain with 1 charge between 5 monomers showed the greatest similarities to the experimental work.

Item Type: Article
Uncontrolled Keywords: BPI
Subjects: 99 - Other
Divisions: 99 - Other
Journal or Publication Title: Colloids and Surfaces A: Physicochemical and Engineering Aspects
Volume: 293
Page Range: pp. 167-174
Identification Number: 10.1016/j.colsurfa.2006.07.025
Depositing User: Sarah Humbert
Date Deposited: 22 Jul 2010 16:50
Last Modified: 23 Jul 2013 09:57
URI: http://eprints.esc.cam.ac.uk/id/eprint/1509

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