Abstract
Gallium-based liquid metal droplet is active particle that maintains a liquid phase at room temperature and perform Self-propelled motion in electrolyte solutions. Unlike passive rigid particles, the collective transportation of swarming liquid metal droplets is strongly influenced by the surface tension, the shape deformation, the collision dynamics and the coalescence process of liquid metal droplets. We drive the swarming micron-sized Galinstan droplets to pass a Tesla microfluidic valve by applying external electric field, the diodicity of liquid metal droplet flow in Tesla valve is verified experimentally, which increases with respect to an increasing voltage. Theoretical simulations of flow field within the Tesla microfluidic valve suggested different turbulent flow field with opposite input flows. The coalescence of liquid metal droplets was enhanced when the Tesla valve blocks the flow. The collective transportation of swarming self-propelled liquid metal droplets has promising applications in biomedics, flexible electronics and swarm microrobotic technology.
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