Fig. 2: Schematic illustration of customizable appearances of soft electronic pumps.

a Various sizes of soft electronic pumps. The multiscale circumferential cross-sectional areas (S1, S2, S3) could be achieved by combining the different number of minimum electrode pair modular unit, while the multiscale axial length (L) can be achieved by integrating the different number of the pump. b Various shapes of soft electronic pumps. Different shapes, including triangular structure, pentagonal structure, plane structure, and complicated heart-like shape, could be achieved by changing electrode layout, support shape, and shell shape.