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Ultrasonic Dispersion And Depolymerization
Jan 21, 2019

An important application of ultrasonic dispersion is the ability to disperse and depolymerize solids in a liquid. Ultrasonic cavitation produces high shear forces that break up the particle agglomerates into individual dispersed particles.

Traditional dispersion technology

A common method of preparing powders into liquids, such as paints, inks, shampoos, beverages or polishing media. Individual particles are combined by various physical and chemical attractive forces (including van der Waals forces and liquid surface tension), and are more pronounced for higher viscosity liquids such as polymers or resins. This attraction must be overcome to depolymerize and disperse the particles into the liquid medium. The application of mechanical stress can disrupt the agglomeration of the particles while the liquid is pressed between the particles. The powder is typically dispersed in a liquid using different techniques. This includes high pressure homogenizers, agitator bead mills, jet impact mills and rotor-stator mixers.


High-intensity ultrasonic dispersion technology is an effective alternative to the above technology. When ultrasonic waves are introduced into the liquid, the ultrasonic waves in the liquid medium produce alternating high pressure (compression) and low pressure (dilution) cycles. Mechanical stress is used to attract electrostatic forces (such as van der Waals forces) that use particle aggregation. Ultrasonic cavitation in the liquid causes high velocity liquid jets of up to 1000 km/h (about 600 mph). Such a jet squeezes the liquid at high pressure between the particles and separates them from each other, with smaller particles accelerating and colliding with high velocity as the liquid ejects. This makes ultrasonic waves an effective means of dispersion and depolymerization, as well as grinding and fine grinding of micron and submicron sized particles.

超声波分散和解聚

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