Engineers have developed a self propelling robot capable of propulsion without using any motors, servos, or power supply. Instead, these first-of-their-kind devices paddle through water as the material they are constructed from deforms with temperature changes.
The work blurs the boundary between materials and robots. In the self-propelled devices, the material itself makes the machine function. The new propulsion system relies on strips of a flexible polymer that is curled when cold and stretches out when warm. The polymer is positioned to activate a switch inside the robot’s body, that is in turn attached to a paddle that rows it forward like a rowboat. The switch is made from a bistable element, which is a component that can be stable in two distinct geometries. In this case, it is built from strips of an elastic material that, when pushed on by the polymer, snaps from one position to another.
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