The cool breeze of an air conditioner can provide much-needed relief in scorching heat, but these units consume substantial amounts of energy and can release potent greenhouse gases. Now, scientists have introduced an environmentally friendly alternative — a plant-based film that cools down when exp
osed to sunlight and comes in a variety of textures and vivid, iridescent colors. This material has the potential to cool down buildings, vehicles, and other structures without the need for external power in the future.American Chemical Society “To make materials that remain cooler than the air around them during the day, you need something that reflects a lot of solar light and doesn’t absorb it, which would transform energy from the light into heat,” says Silvia Vignolini, Ph.D.
Some paints and films currently in development can achieve PDRC, but most of them are white or have a mirrored finish, says Qingchen Shen, Ph.D., who is presenting the work at the meeting. Both Vignolini and Shen are at Cambridge University . But a building owner who wanted to use a blue-colored PDRC paint would be out of luck — colored pigments, by definition, absorb specific wavelengths of sunlight and only reflect the colors we see, causing undesirable warming effects in the process.
As it turns out, cellulose is also one of the few naturally occurring materials that can promote PDRC. Vignolini learned this after hearing a talk from the first researchers to have created a cooling film material. “I thought wow, this is really amazing, and I never really thought cellulose could do this.”
پاکستان تازہ ترین خبریں, پاکستان عنوانات
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