Abstract
The formation of aggregates in colloidal dispersions has been investigated using conductivity-counting and microscopy. Monodispersed sterically stabilized polystyrene, latex particles with diameters of 0.92 and 1.9 μm, concentrated oil-in-water emulsion with an average droplet size 2.5 μm and human red blood cells (∼ 5.7 μm in diameter) were used for investigating the effect of particle size and volume fraction on the aggregate formation. It was found that the aggregate size increased with increase in particle volume fraction. At high volume fraction the orifice could be blocked by the large aggregate. Internal labeling (using standard calibration latex particles) showed that about 0.1% of the dispersion was in aggregate form. Theory suggested this was due to adhesion between the particles with an estimated adhesion energy around 3 kT.
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