A Bioinspired Photon‐Gated Phase‐Change Textile for Two‐Stage Heat‐Flux Regulation of Building Envelopes
Jinyang Jiang, Yuxuan Wang, Liguo Wang, Han Wang, Zeyu Lu, Fengjuan Wang, Shiyu Sui, Zhiyong Liu, Yongping Zeng, Junlin Lin, Yu Zhang, Yuncheng Wang, Siyi Ju, Yanlin HuoABSTRACT
Passive cooling textiles for buildings must do more than reflect sunlight; they must also buffer transient heat under real outdoor conditions. Here we report a continuous coaxial wet‐spinning strategy for fabricating a microencapsulated phase‐change material (mPCM)‐integrated radiative‐cooling meta‐fabric (MFRP), consisting of a thermoplastic polyurethane (TPU)/hexagonal boron nitride (h‐BN)/barium sulfate (BaSO 4 ) photon‐regulating sheath and a TPU/mPCM latent‐heat core. The spatially separated architecture integrates broadband solar reflection, atmospheric‐window emission, and phase‐change thermal buffering within one fiber platform. The optimized meta‐fabric shows high solar reflectance (95.44%), strong atmospheric‐window emissivity (96.21%), and a melting enthalpy of 102.28 J/g. In a representative sunny‐day test, MFRP reduced the chamber temperature by up to 10.36°C relative to the blank control; three‐day cement‐panel measurements further yielded an average peak‐temperature reduction of 7.51°C ± 2.17°C relative to bare cement. Energy‐balance analysis and climate‐scale modelling further indicate promising cooling‐energy and carbon‐reduction potential in hot and cooling‐dominated regions. These results establish wet‐spun radiative cooling/phase‐change material meta‐fabrics as continuously processable exterior textile candidates for passive building thermal management.