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Researchers at Columbia Engineering have invented a high-performance exterior PDRC [passive daytime radiative cooling] polymer coating with nano-to-microscale air voids that acts as a spontaneous air cooler and can be fabricated, dyed, and applied like paint on rooftops, buildings, water tanks, vehicles, even spacecraft -- anything that can be painted. They used a solution-based phase-inversion technique that gives the polymer a porous foam-like structure. The air voids in the porous polymer scatter and reflect sunlight, due to the difference in the refractive index between the air voids and the surrounding polymer. The polymer turns white and thus avoids solar heating, while its intrinsic emittance causes it to efficiently lose heat to the sky.
Journal Reference:
J. Mandal, Y. Fu, A. Overvig, M. Jia, K. Sun, N. Shi, H. Zhou, X. Xiao, N. Yu, Y. Yang. Hierarchically porous polymer coatings for highly efficient passive daytime radiative cooling. Science, 2018; eaat9513 DOI: 10.1126/science.aat9513
The new desert home paint?
(Score: 2) by realDonaldTrump on Saturday September 29 2018, @04:57AM
That one's between me and God. And I think God likes me A LOT. He made me VERY SMART. Put me in a fantastic Family. In the best Country. And I've made a lot of very very smart decisions. But I've also had tremendous luck. God gave me a beautiful Brain and beautiful Luck. Like nobody else has. I thank Him for that. I'm always thanking Him. And I've done a lot for God -- more than anybody else has ever done. Especially since I went into politics. I picked Mike Pence, very strong God person. Religious. I moved my Embassy to Jerusalem -- fulfilling a Prophecy. Making the Bible come true. And I nominated Brett K., very devout Catholic, for SC. Very strong moves for God. If you were God you'd be very happy right now. And you could say, my agenda is God's agenda. Many people are saying that!!!