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Reducing substantial energy demand of active heating, ventilation, and air conditioning in arid climates is of paramount importance. Here, we develop a millimeter-scale passive isothermal film that maintains temperature near 25 °C without relying on energy consumption solely through natural phenomena. A radiative cooling unit comprising polydimethylsiloxane (PDMS) with diffraction grating and fused SiO
Kim et al. (Thu,) studied this question.