Figure 1.

Schematic illustrations of the propeller-shaped micromotor and synthesizing methods. (a) 3D sketch of the micromotor; (b) 2D sketch of the micromotor with diameter d ~140 μm and an angle of propeller θ ~50°; (c) Schematic illustrations of centrifuge-based droplet-shooting device (CDSD); (d) Synthesizing diagram of the propeller-shaped micromotors. A cross sectional image of the glass capillary (I), the spherical microparticles (II) and the propeller-shaped micromotors with PtNPs (III) are shown; (e,f) Designs of a propeller-shaped micromotor used in our experiments and numerical simulation with a single catalytic site (e) and with double catalytic sites (f).