Two Dimensional Acoustic Manipulation in Microfluidic Channels
Acoustic radiation forces can be used to collect particles within microfluidic systems. The standard way of doing this is to excite a one-dimensional standing wave between a pair of solid walls; the particles will then typically collect at the pressure nodes. Higher degrees of positioning control can be achieved by excitation of additional orthogonal one-dimensional standing waves; this usually requires further walled constraints (two-dimensional collection for example requiring a chamber rather than a channel). In this work we examine methods of exciting two-dimensional fields in a channel using a single transducer as well as the use of pressure fields which are not one-dimensional in nature and the advantages they can offer.
Huixuan Zhang, Ye Han, Fuxiao Chen and Jiuba Wen
L. Xu and A. Neild, "Two Dimensional Acoustic Manipulation in Microfluidic Channels", Applied Mechanics and Materials, Vols. 117-119, pp. 624-632, 2012