Gummy robot does ‘the worm’ when temps change

(Credit: Getty Images)

A new gelatinous robot that crawls, powered by nothing more than temperature change and clever design, brings “a kind of intelligence” to the field of soft robotics, researchers say.

The inchworm-inspired work is detailed in Science Robotics.

One of the gelbots moves along a flat surface by curling slightly and then releasing.
(Credit: Aishwarya Pantula/Johns Hopkins)

“It seems very simplistic but this is an object moving without batteries, without wiring, without an external power supply of any kind—just on the swelling and shrinking of gel,” says senior author David Gracias, a professor of chemical and biomolecular engineering at Johns Hopkins University.

“Our study shows how the manipulation of shape, dimensions, and patterning of gels can tune morphology to embody a kind of intelligence for locomotion,” Gracias says.

Robots are made almost exclusively of hard materials like metals and plastics, a fundamental obstacle in the push to create if not more human-like robots, then robots ideal for human biomedical advancements.

Water-based gels, which feel like gummy bears, are one of the most promising materials in the field of soft robotics. Researchers have previously demonstrated that gels that swell or shrink in response to temperature can be used to create smart structures.

In the new work, the researchers demonstrate for the first time how swelling and shrinking of gels can be strategically manipulated to move robots forward and backward on flat surfaces, or to essentially have them crawl in certain directions with an undulating, wave-like motion.

The gelbots, which researchers created by 3D printing for this work, would be easy to mass produce. Gracias foresees a range of practical future applications, including moving on surfaces through the human body to deliver targeted medicines. They could also be marine robots, patrolling and monitoring the ocean’s surface.

Gracias hopes to train the gelbots to crawl in response to variations in human biomarkers and biochemicals. He also plans to test other worm and marine organism-inspired shapes and forms and would like to incorporate cameras and sensors on their bodies.

Source: Johns Hopkins University