Emulsification with ultrasonic waves. II. Evaluation of three ultrasonic generators and a colloid mill.

Three ultrasonic generators and a colloid mill were evaluated with 25 per cent mineral oil, peanut oil, and safflower oil emulsions, each made with four emulsifier systems. Emulsions were exposed in each apparatus for periods up to fifteen minutes. The best of these emulsions were analyzed after zero, fifteen, thirty, and sixty days storage. From the size-frequency analysis data specific interfacial area, mean globule diameter, and standard deviation were calculated. The Minisonic homogenizer produced emulsions distinctly superior to those made on any other apparatus.