Incorporating passive cooling technologies into personal thermal management is an effective strategy to protect the human body from the exacerbations of global warming. However, for the increasingly harsh outdoor environment, a single gentle heat dissipation route can no longer meet the cooling needs of the human body. Here, we report a passive cooling fabric integrating radiation and sweat evaporation, which consists of a polyvinyl alcohol/tetraethyl silicate (PVA/TEOS) fibrous membrane and a thin thermoplastic polyurethane (TPU) fibrous membrane. The integrated passive cooling fabric (IPCF) exhibits intense solar radiation reflectivity (98.67%) and provides sufficient atmospheric window (AW) emissivity (98.63%) due to the precise design of photonic structures and the inherent optical properties of the matrix. Benefiting from the biological structures of hierarchical porosity and surface energy gradient, the directional perspiration-wicking of IPCF can promote rapid evaporative cooling and keep the skin dry. Outdoor experiments reveal that the IPCF realizes subambient cooling of ∼8.8 °C during midday and human skin cooling of ∼14.7 °C. In the case of simulating perspiration, rapid wick-evaporation further contributes to a cooling of ∼5.7 °C. The high efficiency and energy savings of IPCF provide tremendous advantages for outdoor personal thermal management applications.
Jiechang Liang,Lei Ding,Zilin Yu,Xingcai Zhang,Shiguo Chen,Yuanfeng Wang
Programmable smart textiles with adaptive moisture/heat conditioning (MHC) capabilities are globally being sought to meet the requirements of comfort, energy efficiency, and health protection. However, a universal strategy for fabricating truly scalable and customizable MHC textiles is lacking. In this study, we introduce a scalable in situ grafting approach for the continuous fabrication of two series of smart textile yarns with opposite thermoresponsive wetting behaviors. In particular, the wetting transition temperature can be precisely programmed by adjusting the grafting formula, making the yarns highly customizable. The smart yarns demonstrated excellent mechanical strength, whiteness, weavability, biocompatibility, and washability (with more than 60 home washes), comparable to those of regular textile yarns. They can serve as building blocks independently or in combination to create smart textiles with adaptive sweat wicking and intelligent moisture/heat regulation capabilities. A proposed hybrid textile integrating both the two series of smart yarns can offer dry-contact and cooling/keep-warming effects of approximately 1.6/2.8 °C, respectively, in response to changes in ambient temperature. Our method provides a rich array of design options for nonpowered MHC textiles while maintaining a balance between traditional wearing conventions and large-scale production.
危险品化学品经营许可证（带存储）