Separation of particles in suspensions with irradiating a high frequency ultrasound

含有亚微米颗粒的水悬浮液被超声雾化以分离特定尺寸的颗粒。在雾的帮助下，细小的液滴具有狭窄的尺寸分布，在有限的尺寸范围内的颗粒成功地从悬浮液中分离出来。通过分析所收集颗粒的大小和浓度来表征分离过程。2.4 MHz超声波对样品悬浮液的照射可以分离特定尺寸的颗粒，从90到320 nm，而不考虑材料的类型。在高达1500ppm的颗粒浓度下成功分离。在SiO2悬浮液中加入少量表面活性剂PONPE20，可以分离出较小的颗粒。样品悬浮液脱气导致分离性能下降。悬浮液中的溶解空气在这种分离中起着重要作用。

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.