Researchers have developed an aesthetically pleasing film that reflects sunlight and radiates heat, reducing the need for air conditioning in buildings and cars.
The researchers layered colorful cellulose nanocrystals with a white-colored material made from ethyl cellulose, creating a bi-layered film that was both robust and effective. The films were made in vibrant colors, including blue, green, and red. When placed under sunlight, the films were an average of nearly 40°F cooler than the surrounding air and generated over 120 Watts of cooling power, rivaling many types of residential air conditioners.
The most challenging aspect of this research was finding a way to make the two layers stick together. The CNC films were brittle, and the ethyl cellulose layer had to be plasma-treated to get good adhesion. The result, however, was robust and could be prepared several meters at a time in a standard manufacturing line.The team plans to improve the aesthetic appearance of the cellulose-based cooling films and find ways to make the films even more functional.
The researchers acknowledge support and funding from Purdue University, the American Society of Mechanical Engineers, the European Research Council, the Engineering and Physical Sciences Research Council, the Biotechnology and Biological Sciences Research Council, the European Union, and Shanghai Jiao Tong University., the researchers presented their results at the spring meeting of the American Chemical Society , which is held virtually and in person from March 26-30, 2023.
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