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When the cell phone battery is dead, are you worried about the interruption of the call or the unanswered call? According to the report of the American Physicist Organization Network on February 22, researchers at Wake Forest University in the United States have developed a thermoelectric device called “power felt†that can be used to convert human body heat into electricity by touching it. The cell phone battery soon has enough power to make the next call. The relevant research results are published in the latest Nano Express newspaper.
According to researchers from the University's Center for Nanotechnology and Molecular Materials, this device locks tiny carbon nanotubes into flexible plastic fibers and feels like a fabric. This technique uses the difference in temperature to generate electricity to charge, such as the difference between the room temperature and the body temperature.
"Power felt" can be placed on a car seat to ensure the battery's power needs; it can also be lined with insulated pipes or roof tiles to collect heat to reduce gas or electricity bills; or lined with clothing as a microelectronic charging device; Or, it can be placed on the site of a vein injury to better meet the patient's medical needs.
Researcher Kehuo Itt said that we have wasted a lot of energy in the form of heat, but we can recapture these energy sources, such as "recovering" the energy wasted by cars to increase fuel mileage and increase the power of radios, air conditioners or navigation systems. In general, thermoelectricity is an underdeveloped capture energy technology, but there is still a lot of room for development.
David Carroll, director of the center, said: “Think about this, “Power Mat†is wrapped around the flashlight as an emergency accessory, or to charge the phone to listen to the weather forecast. This device can be used to respond to emergencies such as power outages or accidents. â€
Researchers say that the cost of thermoelectricity makes it unable to be more widely used in mass consumer products. The standard thermoelectric device uses more of a compound known as cesium bromide. Related products such as a mobile refrigerator and a CPU radiator efficiently convert thermal energy into electricity, but it costs 1,000 US dollars per kilogram. If one day "power felt" is added to the phone cover, the cost may only need 1 US dollars.
Currently, the 72 tube layers accumulated on the fabric can produce about 140 nanowatts of power. The team is evaluating several more ways to add layers of carbon nanotubes, making it possible to increase output power even under thinner conditions.
Hewitt said: "Although there is more work to be done before the 'felt felt' is ready to go on the market, it has been imagined that it can be used as a thermoelectric inner liner for a warm jacket, and it can keep people warm and cold when the outside world is cold. If the 'power felt' is efficient enough to power the iPod, its endurance will never be disappointing. This is definitely just around the corner." (Hua Ling)
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