Fig. 4: Propulsion of bioinspired ultrasound microrobot.
From: Ultrasound-activated ciliary bands for microrobotic systems inspired by starfish
a Schematic of an artificial microrobot consisting of a – ciliary band on the left and a + ciliary band on the right. Red and blue arrows indicate tangential and vertical velocity, respectively. b Superimposed time-lapse image (time is advancing in the direction of the blue arrow at the values given below) of controlled translation motion of a microrobot at excitation frequency and amplitude of 68.8 kHz and 20 VPP, respectively (see also Supplementary Movie 6). c Image sequence illustrating the streaming flow profile of the bioinspired microrobot. A stack of 150 images was used; the video was captured using a high-speed camera at a framerate of 1069 fps (see also Supplementary Movie 7). d PIV generated velocity fields demonstrate the complex flow behavior developed in the surrounding liquid. Minimum and maximum flow velocities are marked by red and blue regions, respectively. Scale bars, 250 μm.
