Fig. 1. (a) Experimental setup; (b)-(d) manipulated polystyrene on the loading platform with respect to two-, three- and four-blade structures

Fig. 2. (a) Rotation of four-blade “propeller” at different α values and time. (the red rhombus denotes the entirety structure of propeller, and the red dot denotes the symmetry center); (b) different combinations of particle steering and α values angle relationship (positive is clockwise, negative is counterclockwise)

Fig. 3. Force distributions of (a) two-, (b) three- and (c) four-blade per unit volume with the same field when α=12.5°

Fig. 4. Theoretical and experimental rotational velocity of propellers self-assembled by two-, three- and four-blade (the line of experimental data denotes the range of velocity, and the dot of experimental data denotes the average velocity)