| 摘要 |
An acoustofluidic system comprises a substrate (10) having an essentially rectangular recess with side walls (33), wherein the recess provides a microfluidic channel (30) containing a fluid with droplets (31), and at least one electromechanical transducer (20) attached at the substrate (10) adapted to excite an acoustic field in said channel (30). The side walls (33) are hard acoustic walls having a high specific acoustic impedance mismatch to said fluid in the channel (30) and the transducer (20) is configured to excite bulk acoustic waves (BAW) as standing waves (32) of a predetermined harmonic resonance mode between said hard acoustic side walls (33), which couple into the fluid in the channel (30) exerting acoustic pressure on droplets (31) suspended in said fluid towards the pressure nodal line, pressure antinode line or centerline of the standing wave (32). |
