Micromotors – future components at the heart of 'tiny laboratories' called microfluidic devices
For thousands of years, humans have used cogwheels and gears to turn everything from mill stones to clock hands to engines. But this new design – pushed around by light – churns microscopic particles as a prototype for a new kind of micromotor. The tiny gear (around 10,000 times smaller than a revolving door) is cut out of a polymer and placed on top of a photo-reactive material. A blast of light from above – using a device called optoelectronic tweezers – generates a force at the material’s surface. By rotating this light pattern – researchers call it a 'spanner' (shown in white) – the gear inside swooshes a swarm of particles along. Linked together into systems, micromotors have a bright future inside microfluidic devices, where clues to the behaviour of chemical currents around living cells may depend on their tiny revolutions.
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