Electrospinning Machine | Flexible Ceramic Radiative Cooling Membranes with High Reflectivity in Solar Spectrum, Excellent UVand Fire Resistance

Challenge: Traditional radiative cooling technologies rely on polymers with high solar reflectivity and infrared emissivity. Due to the insufficient UV resistance and flammability of polymers, it is difficult to meet the requirements of building durability and fire safety.
Method: Associate Professor Xu Hongbo and Associate Professor Li Yao from Harbin Institute of Technology collaborated with Professor Lorenzo Pattelli from the Italian National Institute of Metrology to prepare a SiO₂ nanofiber membrane via electrospinning combined with high-temperature calcination, developing an all-inorganic flexible ceramic membrane.
Innovation 1: It exhibits an ultra-high solar reflectivity of 97.8% in the 0.25-2.5 µm spectral range and an infrared thermal emissivity of 92.3% in the 8-13 µm atmospheric transparency window (ATW) band. The maximum sub-ambient temperature drop during daytime is 9.2°C, with a net radiative cooling power of 128.52 W m−2.
Innovation 2: The flexible ceramic membrane can withstand temperatures up to 1000°C, is non-flammable, and after continuous 0.7 kW m-2 UV irradiation for 552 hours, its solar reflectivity decreased by only 1.2%.
https://doi.org/10.1002/adfm.202516949