Abstract
Using Brinkman's method of extending Einstein's relation for the viscosity of very dilute suspensions an equation has been derived which takes into account permanent aggregates and liquid penetration effects. Experiments with uniform particle size latex indicated that appropriate ultrasonic irradiation decreases the viscosity, and this is reflected in a change in the degree of aggregation as measured with a highpower optical microscope. An analysis of literature data indicated that permanent aggregates are present in most if not all experiments and they interfere with the detection of any possible particle size or size distribution effects in dilute suspensions.
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