Researchers have created energy-harvesting yarn from tightly coiled carbon nanotubes, which can be activated by the electrolytes in a simple saline solution. With no need for a battery, these “twistron yarns” have numerous potential applications in wearable, medicinal and oceanic contexts.
How twistron yarn is made
An international research team led by scientists at The University of Texas at Dallas (UT Dallas) and Hanyang University in South Korea constructed the yarn from carbon nanotubes—hollow cylinders 10,000 times smaller in diameter than a human hair. After twist-spinning sheets of carbon nanotubes—with a motion similar to a spinning wheel—to create strong, lightweight yarns, researchers introduced elasticity with additional twist until the yarns coiled akin to an over-twisted rubber band.