Propulsion of Bubble-Based Acoustic Microswimmers
Spelman, Tamsin A
Physical Review Applied
American Physical Society
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Bertin, N., Spelman, T. A., Stephan, O., Gredy, L., Bouriau, M., Lauga, E. L., & Marmottant, P. (2015). Propulsion of Bubble-Based Acoustic Microswimmers. Physical Review Applied, 4 064012(1)-064012(5). https://doi.org/10.1103/PhysRevApplied.4.064012
Acoustic microswimmers present a great potential for microfluidic applications and targeted drug delivery. Here, we introduce armored microbubbles (size range, 10–20 μm) made by three-dimensional microfabrication, which allows the bubbles to last for hours even under forced oscillations. The acoustic resonance of the armored microbubbles is found to be dictated by capillary forces and not by gas volume, and its measurements agree with a theoretical calculation. We further measure experimentally and predict theoretically the net propulsive flow generated by the bubble vibration. This flow, due to steady streaming in the fluid, can reach 100 mm/s, and is affected by the presence of nearby walls. Finally, microswimmers in motion are shown, either as spinning devices or free swimmers.
P. M. acknowledges financial support from the European Community’s Seventh Framework Programme (FP7/2007-2013) ERC Grant Agreement Bubbleboost No. 614655. This work has been performed with the help of the “Plateforme Technologique Amont” de Grenoble, with the financial support of the “Nanosciences aux limites de la Nanoélectronique” Foundation. Support from the EPSRC (T. A. S.) and from a Marie Curie Grant (E. L.) is also gratefully acknowledged.
External DOI: https://doi.org/10.1103/PhysRevApplied.4.064012
This record's URL: https://www.repository.cam.ac.uk/handle/1810/253757