Study of Non-Contact Acoustic Micro-Manipulation in a Microchannel

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This study is on manipulation of particles which flow with medium in a microchannel, using ultrasound from outside of the microchannel. A microchannel of 1 mm x 1 mm in cross section was made on a glass plate of 50mmx50mmx5mm. A sound wave was generated by a transducer on the end of the glass plate, and propagated into a microchannel on a glass plate, where a standing wave field is formed and the particles agglomerate along several layers in the microchannel. Moreover, when a branched microchannel is added in the microchannel, the channel for the particle exit can be selected by the frequency sweep of ultrasound.