Preparation and Performance Study of Knitted Fabrics with Radiative Cooling
Textiles designed for daytime passive radiative cooling have the potential to alleviate the adverse effects of elevated temperatures.This study presents the preparation of two types of knitted fabrics characterized by a ribbed structure,produced using a hand-cranked flatbed machine.The utilized substrates were acrylic and silk,while the finishing agent comprised a mixed dispersion of polyvinyl alcohol(PVA),along with inorganic nanoparticles of silicon dioxide(SiO2)and aluminum trioxide(Al2O3).Subsequently,the fabrics underwent hydrochloric acid etching to introduce perforations,resulting in knitted fabrics with enhanced radiative cooling efficiency.The results indicate that filler particles covered the fabric surface and within the inter-fiber spaces,leading to the formation of uniform micropores following hydrochloric acid etching.The micropores obtained by hydrochloric acid etching can obviously improve the reflectivity of sunlight;compared with the original fabric,the average infrared emissivity of the fabric after hydrochloric acid etching in the atmospheric window is about 87.9%,and the solar reflectivity is 75.0%;the temperature can be reduced by about 12℃compared with the control fabric when the irradiation intensity is 501 mW/cm2,which has a large application potential.
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