Bridging the gap: A Janus structure textile with synergistic radiative cooling and heat conduction for high-efficiency thermal management

Radiative cooling textiles offer a promising approach for personal thermal management, yet conventional single-layer designs often fall short in achieving effective temperature regulation. To overcome this limitation, a Janus-structured PVDF-HDPE/BN textile was prepared via functional group matching and hierarchical structural regulation. The optimized textile, fabricated with 12 wt% PVDF, exhibits outstanding spectral selectivity, with a solar reflectivity of 93.24% and an atmospheric window emissivity of 98.45%, enabling highly efficient sunlight reflection and radiative heat dissipation into outer space. Furthermore, the incorporation of high thermal conductivity h-BN into the bottom layer enhances the in-plane thermal conductivity, facilitating quickly transfer of body heat to the top PVDF radiation cooling layer and thereby enhancing the efficiency of the cooling efficiency. For the personal thermal management applications, the 12PVDF-HDPE/BN textile achieves a daytime temperature reduction of up to 7.59 °C. When applied to the building exteriors, it attains a cooling effect of 9.7 °C under outdoor conditions, with performance further strengthening under increased solar irradiance. In addition, the composite textile demonstrates excellent moisture-wicking and breathability, promoting convective heat convection and enabling more efficient body cooling efficiently. This work provides a scalable and multifunctional material strategy for next-generation radiative cooling textiles suited for both personal and architectural applications.