Controlled Propulsion of Asymmetric Janus Microdimer Swimmers under Rotating Magnetic Fields

摘要

Untethered micro-anorobots at low Reynolds numbers present significant potential in biomedical applications as result of their enhanced power, remote actuation, and versatility. Herein, a highly efficient asymmetric Janus microdimer swimmer propelled by a rotating uniform magnetic field was investigated experimentally. The asymmetric microdimers can achieve speed of 98 μm•s^-1 at 20 Hz and 5 mT. Besides, the controllable and flexible motility performance of microdimer motors can be easily obtained by adjusting the magnetic field. Such an asymmetric Janus microdimer swimmer is highly promising in a variety of realistic micro-anoscale scenarios.