This is interesting…

‘2-faced’ particles act like tiny submarines
Researchers at North Carolina State University have, for the first time, demonstrated ‘induced-charge electrophoresis’ with Janus particles. These particles are microscopic spheres made from two halves of different materials, in this case gold and plastic. In induced-charge electrophoresis, low-frequency alternating current is applied to the water in which the particles are suspended. The particles convert electrical field energy into fluid motion, moving, not parallel to the electric field, but perpendicular to it.

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