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Images from a video recording of the downstream end of the microchannel, during an experiment to extract PS MPs from filtered seawater using acoustophoresis in co-flow operation. (A) The transducer is off, and the PS MPs are shown confined to the outer streams. (B) The transducer is actuated, which displaces the PS MPs to the center of the microchannel. Flow from the center of the microchannel is extracted from the inner exit port.
