'Soft' Robots Can Move on Their Own

Tuesday, April 24, 2018 - 14:22

Researchers led by a University of Houston engineer have designed soft robot, composed of ultrathin sensing, actuating electronics and temperature-sensitive artificial muscle that can adapt to the environment and crawl, similar to the movement of an inchworm or caterpillar.

According to the Science Daily, potential applications range from surgery and rehabilitation to search and rescue in natural disasters or on the battlefield. Because the robot body changes shape in response to its surroundings, it can slip through narrow crevices to search for survivors in the rubble left by an earthquake or bombing, said Cunjiang Yu, Bill D. Cook Assistant Professor of mechanical engineering.

These soft robots, made of soft artificial muscle and ultrathin deformable sensors and actuators, have significant advantages over the traditional rigid robots used for automation and other physical tasks.

The researchers said their work, published in the journal Advanced Materials, took its inspiration from nature. "Many creatures, such as inchworms that have completely soft compliant bodies without any rigid components (e.g., bones), exhibit unprecedented abilities in adapting their shapes and morphologies and unique locomotion behaviors," they wrote.

The prototype adaptive soft robot includes a liquid crystal elastomer, doped with carbon black nanoparticles to enhance thermal conductivity, as the artificial muscle, combined with ultrathin mesh shaped stretchable thermal actuators and silicon-based light sensors. The thermal actuators provide heat to activate the robot.

The prototype is small -- 28.6 millimeters in length, or just over one inch -- but Yu said it could easily be scaled up. That's the next step, along with experimenting with various types of sensors. While the prototype uses heat-sensitive sensors, it could employ smart materials activated by light or other cues, he said.

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