Analytical Sciences

Abstract − Analytical Sciences, 23(4), 385 (2007).

Microparticle Separation with an Acoustic-gravity Field Controlled by Phase-shift Operation
Takashi MASUDO and Tetsuo OKADA
Department of Chemistry, Tokyo Institute of Technology, Meguro, Tokyo 152-8551, Japan
The elution of particles from a coupled acoustic-gravity channel has been controlled by a phase-shift operation. Two ultrasound transducers pasted onto the top and bottom walls of a separation channel were driven at the same frequency, but with different phases. Changing the phases of the ultrasounds has allowed the formation of a node near the channel wall, and particles are retained in the channel. Two types of particles are separated under an appropriate condition.