We report on the use of a high aspect ratio microchannel (Hele-Shaw’s cell) in which ramified iron deposits are electrochemically formed and next subjected to acoustic vibrations in order to fragment them into fine particles. Both the electrodes and a piezoelectric element are integrated in the microchannel. High speed visualization allows to highlight the key role of the co-produced H2 bubbles (during the electrodeposition step) which generate microstreaming when subjected to vibrations. The resulting flow pattern sets in motion the ramified iron branches and bring them to bubbles surfaces where they are fragmented into submicrometric particles of iron.
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