Abstract
The effect of ultrasound energy on the particle size of polyethylene spheres in aqueous suspension, with and without additives such as surfactants and deflocculating agents, and using variable times of exposure to ultrasound, were studied. Particle size was determined microscopically and expressed as the mean diameter of the particles. It was found that ultrasonic waves, at a frequency of 100 kc., caused a significant reduction in particle size only if surfactants were present. It was also observed that surfactants having high HLB values were the most efficient of all additives. Increasing time of exposure to the ultrasound waves brought about a continued reduction of particle diameter up to 2 hr., but that after this time the particle size stabilized, and further exposure produced no significant decrease in the mean diameter of the polyethylene spheres.
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