An international team led by scientists from the University of Texas at Dallas and Hanyang University in Korea has developed carbon nanotube yarns that can be stretched or twisted to produce electricity. Dr. Carter Haynes, an associate researcher at the University of Texas Institute of Nanotechnology, explained: “The easiest way to think of a spiral harvester is that you can use a piece of yarn to stretch it and pull it out of power.†.
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Carbon nanotubes have been used to construct these yarns. They are hollow cylindrical carbons that are 10,000 times smaller than human hair. These nanotubes were first twisted into high-strength, lightweight yarns. In order to make them very flexible, the researchers introduced so many strands of twine together, just like the cable has a long time.
When the yarn is dipped or coated with an ionically conductive material or electrolyte, the yarn can generate electricity. This can simply mix salt and water.
Scientists from Hanyang University in South Korea added that these yarns are basically super capacitors. When the carbon nanotube yarn is inserted into the electrolytic cell, the yarn is charged by the electrolyte, which eliminates the need for an external battery or voltage as required by a conventional capacitor.
The researchers were able to generate 250 watts of peak power after stretching crimped filament yarn 30 times per second. They have shown that the performance can be extended by increasing the diameter of the spiral tube and operating many yarns in parallel.