防紫外-蓝光的辐射制冷双层织物的制备及性能OA

Radiative cooling has gained significant attention as a sustainable technological solution,leveraging passive heat dissipation mechanisms that operate without external energy input.This technology demonstrates considerable potential in addressing global energy conservation challenges and mitigating urban heat island effects.Achieving optimal radiative cooling performance in high-temperature environments requires engineered materials possessing both high solar reflectance to minimize solar heat gain and exceptional mid-infrared thermal emissivity(8-13 μm)to maximize heat dissipation through the atmospheric window.Concurrently,extended exposure to ultraviolet radiation(280-400 nm)and high-energy visible blue light(400-500 nm)in outdoor environments presents substantial risks of cutaneous damage and accelerated photodegradation of textile substrates.Consequently,the development of advanced textile systems that seamlessly integrate efficient radiative cooling with comprehensive electromagnetic radiation protection represents a critical research direction in functional textile engineering. This investigation successfully engineered a dual-layer fabric architecture combining superior UV-blue light attenuation with enhanced radiative cooling capabilities,while maintaining essential textile comfort properties and mechanical durability.The dual-layer fabric configuration incorporates an upper protective layer composed of polyethylene terephthalate filaments(PET)functionalized with core-shell structured cerium dioxide@titanium dioxide(CeO2@TiO2)nanocomposites,serving as the primary UV-blue light absorption matrix.The underlying radiative cooling layer consists of polylactic acid filaments(PLA)substrates deposited with aluminum oxide(Al2 O3)nanoparticles,engineered to optimize photonic reflection and thermal emission characteristics.Comprehensive material characterization included scanning electron microscopy(SEM)with X-ray photoelectron spectroscopy(XPS)for surface topographical and elemental composition analysis.Optical performance evaluation employed UV-Vis-NIR spectroscopy for solar reflectance measurements,Fourier-transform infrared spectroscopy(FTIR)with integrating sphere attachment for thermal emittance quantification,and standardized solar simulator testing for cooling performance validation under controlled irradiation conditions.The dual-layer fabric physical properties were assessed according to international standards:tensile strength,air permeability,moisture vapor transmission rate,Martindale abrasion resistance and color fastness to washing.The engineered fabric demonstrated exceptional performance characteristics,achieving ultraviolet protection factor(UPF)ratings exceeding 50+and blue light transmittance below 15%across the critical 400-500 nm spectrum.Simultaneously,the dual-layer fabric attained a peak solar reflectance of 90.1%and mid-infrared emissivity of 91.78%within the atmospheric window.Thermal performance evaluation revealed a substantial sub-ambient temperature reduction of 8-9℃under direct solar irradiation.Moreover,the dual-layer fabric demonstrated significantly enhanced mechanical properties,with tensile strength increased to 17.3 MPa and elongation at break reaching 11.1%.The dual-layer fabric retained approximately 80%of the original fabric's air permeability and moisture vapor transmission rate.When subjected to 1 000 abrasion cycles,the fabric maintained solar reflectance and mid-infrared emissivity above 80%.After 20 laundering cycles,both solar reflectance and mid-infrared emissivity remained above 85%.These results collectively indicate that the dual-layer fabric possesses excellent durability and comfort for wearable applications. This study successfully develops a novel double-layer fabric that synergistically integrates effective UV-and blue-light protection with efficient passive radiative cooling performance,providing innovative technical reference for the design and application of personal thermal management textiles,and contributing to energy savings and improved human comfort in hot climates.