Microparticle acoustophoresis in silicon channels with a width of 340 μm. (a)–(c), Particle traces and numerical results for polystyrene beads. (d)–(f), Particle traces and numerical results for PDMS beads. (a) and (d), Experimental particle traces in the x-y plane (a: polystyrene beads; d: PDMS beads). (b) and (e), Numerical results of radiation force potential and acoustic radiation forces in the x-z plane (b: polystyrene beads; e: PDMS beads). (c) and (f), Numerical results of bead trajectories and final locations in the x-z plane (c: polystyrene beads; f: PDMS beads)