Magnetic Droplets (VIDEO)
Caption
Video of three ferromagnetic liquid droplets containing iron oxide nanoparticle dispersions shaped into cylinders using a microfluidic device, and then locked in shape by the formation of magnetic nanoparticle surfactants at the interface.
The cylindrical droplets were placed in an oil having the same density, so they are buoyant, and then placed on a stirring plate with a spinning bar magnet. Once magnetized, they behave like floating solid magnets, spinning and dancing with each other.
A small drop of a dye solution (Nile Red) was added to the oil to track the flow field around the rotating ferromagnetic liquid droplets.
The video is recorded from top view and played in real time. The volume of the ferromagnetic liquid droplets is 2μL, and the length of the ferromagnetic liquid cylinder is 2 mm.
Credit
Xubo Liu and Tom Russell/Berkeley Lab
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License
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