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Infrared-radiation-enhanced Nanofiber Membrane for Sky Radiative Cooling of the Human Body.

Extreme heat events can cause a number of health-related problems, including an increase in deaths and nonfatal outcomes. However, there is a lack of outdoor thermal management for protecting people from extreme heat events. We present a novel infrared-radiation-enhanced nanofiber membrane (NFM) that has good infrared resonance absorption and selectively radiates thermal energy of the human body through the atmosphere and into cold outer space. The PA6/SiO2 NFM comprises PA6 nanofibers and randomly distributed SiO2 submicron spheres and has sufficient air permeability and thermal-moisture comfortability because of its interconnect nanopores and micropores. We measure the sky radiative cooling performance under a clear sky, PA6/SiO2 NFM produces temperature that are about 0.4-1.7 ℃ lower than those of commercial textiles when covering dry and wet hands, and temperatures 1.0-2.5 ℃ lower than the ambient temperature when thermal conduction and convection are isolated in a closed device. Our processed PA6/SiO2 NFM combines sky radiative cooling with thermal management of the human body very well, which will promote the development of radiative cooling textiles.