Magnetic Janus origami robot for cross-scale droplet omni-manipulation.The versatile manipulation of cross-scale droplets is essential in many fields. 
Magnetic Janus origami robot
Here, a type of magnetically actuated Janus origami robot is readily fabricated for versatile cross-scale droplet manipulation including three-dimensional transport, merging, splitting, dispensing and release of daughter droplets, stirring and remote heating. 
magnetically actuated Janus origami robot
The robot allows untethered droplet manipulation from ~3.2 nL to ~51.14 μL. 
untethered droplet manipulation
The combination of magnetically controlled rotation and photothermal properties further endows the robot with the ability to stir and heat droplets remotely. 
photothermal properties