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In a video, robot researchers reveal that they have built a half-millimeter wide remote-controlled walking robot shaped like a crab, hoping that it will be able to carry out tasks in small crevices one day.
According to a study published in the journal Science Robotics , the researchers were thinking of applications such as minimally invasive surgery or manipulating cells or tissue in biological research.
Smaller than a flea, the robot crab has a tick-like body with 10 protruding legs that can crawl, walk, turn, and even jump. It can move at speed half its body length per second - a huge accomplishment at such a small scale, scientists say.
The boffins described the design that allows it to straighten when heated and bend when cooled. The heat is applied remotely through a laser then dissipates quickly thanks to the robots' small size.
The balance between forces associated with a one-way shape memory alloy and elasticity of an encapsulating shell leads to reversible deformations of these structures.
Also lacking batteries, servos, and other electronics, these machines are incredibly light and impossible to detect by the human eye.
As a result of the structures' tiny size, the rate of cooling is very fast. In fact, by reducing the size of these robots, they run more quickly," lead researcher and nanofabrication expert John Rogers explained to Northwestern's news page.
The crab-like design was Rogers's creative whim, however its manufacturing was influenced by pop-up books from his childhood.
As part of this assembly method, fabricated precursors are bonded to rubber substrates, which buckle when relaxed and pop up into a three-dimensional shape.
Aside from the flea-sized crab-bots, researchers also developed millimeter-sized robots in the shape of inchworms, crickets, and beetles. They are currently without a purpose, other than adding to humanity's knowledge base.
“These collective advances in materials, manufacturing, actuation, and sensing add to the growing capabilities in this emerging field,” the researchers claimed.
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