Chinese scientists have developed high-efficiency day cooling materials

A team of Chinese scientists has developed a high-performance day cooling material that can effectively radiate heat outwards and cool down well. The new material can be applied directly to the surface of any texture object like a coating, and can be combined with different pigments to achieve different colors.
Yang Yuan and Yu Nan of Columbia University's Department of Applied Physics and Applied Mathematics said in a paper published in the new issue of Science that they have developed a new material called a multi-scale micro-nacon structure of "poly-difluoroethylene-hexafluoropropylene co-property". Films made of this material have a high reflectivity of 96% to 99.6% in the solar band, a high radiation rate of 97% in the infrared radiation window, and refrigeration
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during the day without
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test results show that the surface temperature of the film can be about 5.9 degrees Celsius lower than the ambient temperature in a well-lighted dry environment, and in a humid environment, the film temperature can be about 2.9 degrees Celsius lower than the ambient temperature. According to the introduction, this porous film, polydifluoroethylene and air refractive index is very different, can effectively scatter sunlight, including ultraviolet, visible and near-infrared light, so as to achieve high reflectivity, will not be heated by sunlight;
it is understood that the preparation of similar functional materials requires complex vacuum deposition equipment and is difficult to cover directly on the surface of objects of any shape and texture. The new material has the advantages of low cost and strong suitability, and can be applied directly to any surface such as plastic, metal and wood.
Yang Yuan told Xinhua that the surface of buildings often requires color, the material can be combined with pigments to achieve color while reflecting invisible near-infrared light in the sun, compared with traditional coatings, can significantly reduce the temperature of the building.
Gang, a professor in the Department of Mechanical Engineering at the Massachusetts Institute of Technology in the United States, said that technically, the coatability of materials can reduce costs and a wide range of applications. (Reporter Zhou Zhou)