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(a) Diagram of the microfluidic channel with the SEM image of the silicon master mold. The wavy structures are transferred onto the PDMS channel sidewall. (b) Cartoon representation of the mixing of two reagents when the bubble along the sidewall of the microfluidic channel collapses in the presence of acoustic waves. Two reagents flowing side-by-side in the channel mix by the induced mass transport via the bubble cavitation from the sidewall.
