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Chemistry in Pictures: Droplet with a steering wheel
The two-phase droplets—named Janus droplets after the two-faced Roman god—are made mainly of a hydrocarbon on one side and fluorinated fluid on the other. Narani was able to get magnetic iron oxide nanoparticles to sit on the boundary between the two halves, thus creating the black lines that divide them. When Narani changes the direction of a magnetic field, the nanoparticles swing and swerve inside their containers, allowing him to drive the droplets around.
He says this kind of manage could be useful in applications like sensing, catalytic processes, and drug delivery.
Submitted by Rakesh Narani and Che-Jen Lin. Follow Narani on Instagram at @rakeynarani.
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