Simply put, you take a piece of yarn and stretch it to produce electricity. Sew them into the top, no external power supply is required, and people can generate electrical signals when they breathe normally. Dr. Carter Haynes, of the Institute of Nanotechnology at the University of Texas at Dallas, said in an interview with a Sino-foreign cooperative research published in the journal Science.
The yarn, called Twistron, is spun from a number of carbon nanotubes, and the diameter of a single carbon nanotube is 10,000 times smaller than the diameter of a human hair. In order to make the yarn highly elastic, researchers have continuously increased the twist to form a spring-like structure.
"These yarns are essentially a supercapacitor, but it doesn't require an external power source to charge," said Dr. Li Na of the Nano Research Institute. Because the carbon nanotubes differ from the chemical potential of the electrolyte, a portion of the charge is embedded when the yarn is immersed in the electrolyte. When the yarn is stretched, the volume is reduced, the charges are brought closer to each other, and the voltage generated by the electric charge is increased to obtain electric energy.
“When stretching at a frequency of 30 times per second, the yarn can produce a peak electric power of 250 watts/kg. A yarn that weighs less than the fly can illuminate an LED each time it is stretched.†Nano Research According to Dr. Bowman, one of the directors and author of the article, the power per unit weight of Twistron yarns can be increased by more than 100 times compared to other woven fiber.
It is worth mentioning that salt water can also act as an electrolyte. The output of the power generation yarn can be scaled up as the yarn volume increases and the number of yarns working in parallel increases. “If you reduce production costs, Twistron can eventually be used for wave power generation,†Bowman said.
Currently, the most suitable application for carbon nanotube yarns is to power sensors or IoT communications. “Based on our average output power, we only need 31 milligrams of yarn to transmit 2 kilobytes of data packets every 10 seconds for the Internet of Things within a radius of 100 meters.â€
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