Fig. 9
From: Characterizing dynamic behaviors of three-particle paramagnetic microswimmer near a solid surface
a Time-lapse images of the three-particle magnetic microswimmer which is actuated with simple rotation under a rotating magnetic field at a frequency of 7 Hz. b The microswimmer is actuated with dynamic behaviors (0–2 s) and steady propulsion (2–29 s) under a rotating magnetic field at a frequency of 9 Hz. At 0–2 s, the focal plane is on the substrate, and then, the focal plane is adjusted to a plane 20 \(\upmu \hbox {m}\) (3–14 s) and 40 \(\upmu \hbox {m}\) (15–29 s) above the substrate, respectively. Blue arrows refer to the rotation direction of the microswimmer. Scale bar is 10 \(\upmu \hbox {m}\); all the images in a, b have the same scale bar