Fig. 5: Experimental photographs of ferrofluid droplet picking up and transporting cargo.

a Photograph showing the initial state of the droplet and cargo. b–d Chronologically arranged images of the ferrofluid droplet as it moves up an inclined plane to pick up the cargo. e–g Chronologically arranged images of the ferrofluid droplet as it moves down the inclined plane to deliver the cargo. (scale bar = 1 mm).