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The proposed mechanisms for micromotors of different geometries. (a) There are two propelled mechanisms for rod micromotors: (I) the rod micromotors are propelled by bubbles generated at the surface at one end of microrods [23], and (II) the electrokinetic mechanisms of microrods [24]; (b) bimetal Janus microspheres propelled by diffusing of bubbles at the surface of microspheres; (c) conical micromotors propelled by growth and jet of bubbles generated by chemical catalytic reactions.
