| 초록 |
The annual cooling or air conditioning energy demand is rapidly increasing, and there is a significant adverse effect on global warming. To resolve the indiscriminate use of energy, greenhouse gas emission problems, we believe that a passive radiative cooling (PRC) strategy that cools without any electricity input can significantly reduce global energy consumption. PRC involves cooling a surface by reflecting sunlight and radiating heat to the cold outer space simultaneously. Previously proposed nanophotonic devices can achieve PRC, but the use of expensive metallic films and the complicated process limit large-scale applications. In this study, we propose porous polymers of lightweight, flexible and low-cost materials. The porous media provide the high solar reflectivity and high mid-IR emissivity. Our porous polymers can be used as coating materials as well as freestanding films, so expected to be the state-of-the-art polymer coating solution for saving the energy. |
