Oil-paper-umbrella-inspired passive radiative cooling using recycled packaging foam

Abstract

Passive daytime radiative cooling (PDRC) is a promising energy-saving cooling method to cool objects without energy consumption. Although numerous PDRC materials and structures have been proposed to achieve sub-ambient temperatures,...

POSS/PVTMS aerogels for passive cooling and THz communication via cross-linking density regulation and nanoscale bimodal design

“…Ma et al 20 designed silica aerogel materials with micro-scale pore size and struts, and hence greatly enhanced the solar light reflectivity and passive cooling properties. Liu et al 21 combined polystyrene foam (with micro-scale pores) with tung oil to simultaneously achieve efficient passive radiative cooling and enhanced thermal dissipation. Meanwhile, porous materials also show low dielectric properties for enhancing the electromagnetic wave (EMW) transmission properties and improving the signal propagation speed.…”

A porous micro/nano-structured polyethylene film prepared using a picosecond laser for agricultural passive cooling

“…7–9 Recently, passive cooling materials relying on highly solar reflective and thermally emissive radiation to achieve “green cooling” have attracted more attention. 10–13 On the one hand, significant progress in polymer-based coating cooling materials has been achieved, including hierarchically porous polymer coatings and scalable cooling coatings. 14,15 On the other hand, several novel cooling materials have also been reported, 16–20 such as nano-micro-structured plastics, 21 nanofiber membranes, 22 gradient epsilon-near-zero materials, 23 etc .…”

Construction of a Robust Radiative Cooling Emitter for Efficient Food Storage and Transportation

“…Recently, passive radiative cooling (RC) technology is widely investigated as a promising strategy to drop the temperature with zero energy consumption. − The cooling performance of an object is usually restricted by solar irradiation (mainly concentrating in the visible and near-infrared region), which brings huge heat to the object. − Meanwhile, due to the synergistic effect of the molecules in the atmosphere, the infrared radiative heat dissipation is impeded from reaching the outer space, whereas in the range of 8∼13 μm, which is called an atmospheric window, infrared thermal radiation can easily pass the atmosphere. − Thus, passive RC can achieve subambient cooling all around the day by maximizing both the sunlight reflection and infrared emission within 8∼13 μm. − Until now, dielectric spheres, bionic structure, paints, ,, and other kinds of materials has been widely used in the RC. Among various kinds of RCs, polymer-based RC emitters stands out for its unique merits such as superior cooling capability, low cost, and excellent scalability. − Hence, it offers a new promising approach for prolonging food preservation in the gaps of cold chain logistics.…”