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(2016) 20th International Conference on Miniaturized Systems for Chemistry and Life Sciences, MicroTAS 2016, pp. 715-716.

Acoustic bubbles microstreaming-induced fragmentation of ramified iron electrodeposits in a microchannel

Iranzo, A., Tzedakis, T., Chauvet, F.

- 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.