In this paper, we study the ultrasonic manipulation of micro/nano in an ultrasonic standing wave field. Starting from the forces acting on particles in stationary standing wave field, we studied the factors affecting ultrasonic manipulation of micro/nano particles within the fluidic medium. Based on analyzing particles’ motion in an ultrasound – gravity coupled field, we proposed and discussed a new application using ultrasonic manipulation of particles to categorize different kinds of micro/nano particles in fluidic medium.

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