Separation of particles in suspensions with irradiating a high frequency ultrasound

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Aqueous suspensions containing submicron particles were ultrasonically atomized for separating particles of a specific size. With the help of a fog involving fine liquid droplets with a narrow size distribution, particles in a limited size-range were successfully separated from suspensions. The separation was characterized by analyzing the size and the concentration of collected particles. Irradiation of 2.4 MHz ultrasound to sample suspensions allowed the separation of particles of specific size from 90 to 320 nm without regarding the type of material. Successful separation was attained at a particle concentration as high as 1500 ppm. Addition of a small amount of surfactant, PONPE20 to SiO2 suspensions resulted in the separation of smaller particles. Degassing of the sample suspension resulted in eliminating the separation performance. Dissolved air in suspensions plays an important role in this separation.