Journal
SMALL
Volume 5, Issue 14, Pages 1688-1692Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.200900021
Keywords
bubbles; catalytic motion; jet engines; nanotechnology
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Strain-engineered microtubes with an inner catalytic surface serve as self-propelled microjet engines with speeds of up to approximate to 2 mm s(-1) (approximately 50 body lengths per second). The motion of the microjets is caused by gas bubbles ejecting from one opening of the tube, and the velocity can be well approximated by the product of the bubble radius anti the bubble ejection frequency. Trajectories of various different geometries are well visualized by long microbubble tails. If a magnetic layer is integrated into the wall of the microjet engine, we can control and localize the trajectories by applying external rotating magnetic fields. Fluid (i.e., fuel) pumping through the microtubes is revealed and directly clarifies the working principle of the catalytic microjet engines.
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