Acoustically-actuated bubble-powered rotational micro-propellers

Bubble-powered acoustic microsystems span a plethora of applications that range from lab-on-chip diagnostic platforms to targeted interventions as microrobots. Numerous studies strategize this bubble-powered mechanism generate autonomous self-propulsion microrobots in response high frequency sound waves. Herein, we present two micro-propeller designs which contain an axis-symmetric distribution entrapped bubbles vibrate induce fast rotational motion. Our micro-propellers are synthesized using 3D Direct Laser Writing and chemically-functionalized selectively trap air at their micro-cavities function propulsion units. These offer dual advantage being used mobile microfluidic mixers, for manipulation. With regards manipulation, demonstrate magneto-acoustic actuation our first propeller design can be steered desired location perform Furthermore, second comprises helical arrangement bubble-filled cavities makes it suitable spatial micro-mixing. propellers reach speeds up 400 RPM (rotations per minute) without requiring any direct contact with vibrating substrate contrast the state-of-the-art rotary microsystems.