4A zeolite based daytime passive radiative cooling material

Cooling capacity evaluation of passive radiation cooling materials

“…The absorption power of 80 W/m 2 corresponds to that the radiation film has a transmittance of nearly 10%, so it is important to improve the sunlight reflection of the radiation film, otherwise the radiation film is difficult to obtain the cooling effect during the daytime. In this case, the temperature inside the test chamber was used as the environmental comparison temperature to evaluate the radiation cooling capacity in some articles [13][14][15][16]. As can be seen from figure 6 (b), for the case of 80 W/m 2 pad absorbing power, although the temperature at the center of the radiation film is greater than the external ambient temperature, it is still less than the temperature near the inner wall of the insulation chamber.…”

Emulating Solar Spectral Reflectance of Natural Leaf with Bionic Leaf Prepared from 4A Zeolite-Derived Ultramarine Green Pigment

“…At the wavelength over 1000 nm, products M2 and M3 show obvious water absorption peaks at the wavelength of 1450 nm and 1940 nm. This is largely due to the structure of the LTA phase (Lind type A zeolite), whereby LTA possesses a pore size of 0.4 nm that is similar to the size of the water molecule [ 15 ]. However, the water absorption peaks are not observed for products M1 and M4.…”

“…Moreover, the nanoparticle-loaded 4A-zeolite was used to prepare the PVA/gelatin films, which may be used as an environmentally friendly alternative to plastic packaging materials in the food industries [ 14 ]. In addition, we also reported that the 4A zeolite is a promising energy-saving material for daytime passive radiative cooling [ 15 ]. However, zeolite has rarely been reported as a bionic material.…”

Commercial‐Like Self‐Cleaning Colored ZrO2‐Based Bilayer Coating for Remarkable Daytime Sub‐Ambient Radiative Cooling

“…[8] Therefore, it is of great importance to develop the PDRC material, which is beneficial to achieve the goal of "carbon neutrality. "Recently, some PDRC materials and structures have been reported, such as multilayer photonic structures, [9][10][11] porous polymer materials, [12][13][14][15][16] emitters on a metal substrate, [17][18][19][20][21][22] aerogels, [23,24] particles-polymer paint-like coatings, [25][26][27][28][29][30][31][32] and so on, especially, the paint-like PDRC coatings is considered as a promising passive cooling method duo to their simple preparation, low-cost, and large-scale utilization. At present, CaCO 3 , [25] BaSO 4 , [26] TiO 2 , [27,28] MgHPO 4 •1.2H 2 O, [29] Ca 0.5 Mg 10.5 (HPO 3 ) 8 (OH) 3 F 3 , [30] 4A zeolite, [31] and ZIF-8 modified ZnO [32] were usually used as pigments to prepare white PDRC coatings.…”

“…"Recently, some PDRC materials and structures have been reported, such as multilayer photonic structures, [9][10][11] porous polymer materials, [12][13][14][15][16] emitters on a metal substrate, [17][18][19][20][21][22] aerogels, [23,24] particles-polymer paint-like coatings, [25][26][27][28][29][30][31][32] and so on, especially, the paint-like PDRC coatings is considered as a promising passive cooling method duo to their simple preparation, low-cost, and large-scale utilization. At present, CaCO 3 , [25] BaSO 4 , [26] TiO 2 , [27,28] MgHPO 4 •1.2H 2 O, [29] Ca 0.5 Mg 10.5 (HPO 3 ) 8 (OH) 3 F 3 , [30] 4A zeolite, [31] and ZIF-8 modified ZnO [32] were usually used as pigments to prepare white PDRC coatings. Among these paint-like PDRC coatings, it is worth noting that the BaSO 4 -based PDRC coating has the optimal reflectance (R solar = 0.981) and high emissivity (ε 8-13µm = 0.93), which could be further improved, as the ideal PDRC coating is with the close-to-unity reflectivity and emissivity for the solar spectrum and atmospheric window, respectively.…”