A U.S. Patent Application for “Particles for Use in Acoustic Standing Wave Processes” was published by FloDesign Sonics on May 16th, 2019. The present invention is a method for concentrating particles in a primary fluid at a first location, comprising: flowing a fluid mixture comprising the particles and the primary fluid through an acoustophoretic device that comprises: an acoustic chamber through which the fluid mixture flows; and an ultrasonic transducer including a piezoelectric material that can be driven to create an acoustic wave in the acoustic chamber; and driving the ultrasonic transducer to create the acoustic wave; wherein the acoustic wave concentrates the particles at the first location. Learn More