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Interparticle Forces and the Rheology of Colloidal Dispersions

Published online by Cambridge University Press:  15 February 2011

Bernard A. de L. Costello ,
Paul F. Luckham  and
Tharwat F. Tadros
Bernard A. de L. Costello
Affiliation:
Department of Chemical Engineering and Chemical Technology, Imperial College of Science, Technology and Medicine, Prince Consort Road, London, SW7 2BY, U.K.
Paul F. Luckham
Affiliation:
Department of Chemical Engineering and Chemical Technology, Imperial College of Science, Technology and Medicine, Prince Consort Road, London, SW7 2BY, U.K.
Tharwat F. Tadros
Affiliation:
ICI Agrochemicals, plc., Jealotts Hill Research Station, Bracknell, Berks, RG12 6EY, U.K.
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Abstract

The forces between mica surfaces bearing adsorbed layers of graft copolymers of either polyethyleneoxide/ polymethylmethacrylate in water or polyhydroxystearic acid / polymethylmethacrylate in decalin have been measured. The forces are repulsive in nature and in both cases commence at a surface separation of ˜ 25 nm. They may be described by scaling theory. The results are compared to the rheology of particles stabilised by the same copolymers, in particular to the elastic modulus. It is found that these two parameters scale in the same way, but quantitative comparison reveals that the modulus predicted from the particle forces is some 1 – 2 orders of magnitude greater than that measured experimentally.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 289: Symposium M – Flow and Microstructure of Dense Suspensions , 1992 , 19
Copyright
Copyright © Materials Research Society 1993

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