According to the U.S. Energy Information Administration, air conditioning and other space cooling uses about 10% of all U.S. electricity consumption. Researchers are now reporting in the US Materials and interfaces used by ACS created a material that cools the wearer without the use of any electricity. The fabric transfers heat, allows moisture to evaporate from the skin and repels water. Watch a video about the new fabric here.
Cooling the human body is much more efficient than cooling the whole room or building. Various garments and textiles have been designed for just that, but most of them have drawbacks such as poor cooling capacity; high electricity consumption; complex, time-consuming production; and / or expensive costs. Yang Si, Bin Ding, and his colleagues wanted to create a personal cooling fabric that could effectively transfer heat from the body while being breathable, water-repellent, and easily made.
The new material was produced by researchers by electrospraying a polymer (polyurethane), a water-repellent polymer variant (fluorinated polyurethane) and a thermal conductor filler (boron nitride nanosheets) into nanofiber membranes. These membranes repelled water from the outside, but they had pores large enough for sweat to evaporate from the skin and air to circulate. Boron nitride nanoparticles are coated with polymer nanofibers to form a network that has passed heat from an internal source to the outside air. During the tests, the thermal conductivity was higher than that of many other conventional or high-tech fabrics. Membranes can be useful not only for personal cooling, but also for solar energy collection, seawater desalination, and thermal management of electronic devices, the researchers say.
The flexible material shows that the fabrics can be warm, cool
Xi Yu et al., Thermally conductive, moisture-permeable and superhydrophobic nanofiber membranes with an intertwined boron nitride network for personal cooling fabrics, Materials and interfaces used by ACS (2020). DOI: 10.1021 / acsami.0c04486
Submitted by the American Chemical Society
Citation: The new fabric can help you cool off in the summer, even without air conditioning (July 29, 2020). July 30 From https://phys.org/news/2020-07-fabric-cool-summer-ac. html
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