Magnetic Droplet‐Based Transporters Co‐Regulated by Wettability and Magnetic Field

Abstract The adhesion behavior of liquid droplets on solid surfaces is critical for natural transportation and industrial production. In particular, microrobots based on adhesion at solid‐liquid interfaces have important applications in chemical reactions, cargo transport, and motion control. However, current droplet‐based manipulation strategies primarily depend on the structures or reactions between solid‐liquid interfaces to achieve programmable droplet movement, while robust carrying capacity and precise synergistic operation of multiple droplets remain challenging. Herein, a magnetic droplet‐based transporter system (MDTs) with adjustable structures to achieve precise droplet manipulation for robust cargo transportation and energy conversion is proposed. By controlling the magnetic fields and the droplet adhesion at the solid‐liquid interfaces, the MDTs can precisely transport, climb, and rotate, as well as efficiently generate electrical signals for motion monitoring. These findings deepen the understanding of force transport co‐directed by surface wettability and magnetic fields and broaden the utilization of these systems for cargo transportation and motion monitoring, offering great potential for contactless blind operation, lossless transfer, and reactions.