Figure 8.
US-responsive microbubble-activated microrobots
(A) US-activated bubble-propelled 3D microdrone. (i) Schematic illustration of the mechanism of US-activated oscillating gaseous bubble for propelling the microdrone. (ii) Schematic design showing the three groups of microtubes in the microdrone. (iii) Digital image of the microdrone. (iv) Tracking trajectories showed the US controllability and repeatability of the 3D microdrone.97 Copyright 2020, The Royal Society of Chemistry.
(B) The 3D-printed acoustic microrobots. (i) Schemes of the microrobots in Newtonian and non-Newtonian fluid. (ii) A microrobot encasing a microbubble in PBS. (iii) A microrobot filled with low-surface-tension liquid. (iv and v) Comparison of the under-mucus motion between magnetic microrobots (iv) and acoustic microrobots (v).98 Copyright 2022, the authors.