Micromotors push around single cells and particles

A new type of micromotor — powered by ultrasound and steered by magnets — can move around individual cells and microscopic particles in crowded environments without damaging them. In one demonstration, a micromotor pushed around silica particles to spell out letters. Researchers also controlled the micromotors to climb up microsized blocks and stairs, demonstrating their ability to move over three dimensional obstacles.
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