Sperm-Inspired Robots Controlled by Magnetic Fields May be Useful for Drug Delivery, IVF, Cell Sorting and Other Applications at the Microscopic Level
A team of researchers at the University of Twente (Netherlands) and German University in Cairo (Egypt) has developed sperm-inspired microrobots, which can be controlled by oscillating weak magnetic fields.
Described in a cover article in the journal Applied Physics Letters, which is from AIP Publishing, the 322 micron-long robots consist solely of a head coated in a thick cobalt-nickel layer and an uncoated tail. When the robot is subjected to an oscillating field of less than five millitesla – about the strength of a decorative refrigerator magnet – it experiences a magnetic torque on its head, which causes its flagellum to oscillate and propel it forward. The researchers are then able to steer the robot by directing the magnetic field lines towards a reference point.
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