Abstract
Orthokinetic flocculation of latex particles containing high levels of surface carboxylation was studied by shearing for short times in a rotational viscometer and measuring changes in particle size using photon correlation spectroscopy. Results can be interpreted in terms of a comparison between the DLVO repulsive force between a pair of particles and the hydrodynamic shear force opposing it. This enables a prediction of the critical shear rate,\(\dot \gamma _{crit} \), required to initiate aggregation. Experimental and calculated values of\(\dot \gamma _{crit} \) showed good agreement.
The stability of the carboxylated latices under shear was much reduced at pH values >7 when the surface groups are ionised. The increase in suspension viscosity with pH was shown to be critical in determining the onset of aggregation via hydrodynamic forces.
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Husband, J.C., Adams, J.M. Shear-induced aggregation of carboxylated polymer latices. Colloid Polym Sci 270, 1194–1200 (1992). https://doi.org/10.1007/BF01095060
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DOI: https://doi.org/10.1007/BF01095060