Currently,there is an imperative demand for developing a novel flexible heater with high adhesion,breathability,and extreme condition resistance,such as ultra-high temperatures and even fire.Herein,a high-adhesion,fla...Currently,there is an imperative demand for developing a novel flexible heater with high adhesion,breathability,and extreme condition resistance,such as ultra-high temperatures and even fire.Herein,a high-adhesion,flame-retardancy,and anti-bacteria copper nanoparticles networks/nylon 6 woven fabric(CNNs/NWF)wearable heater with a“sandwich-like”structure has been designed and fabricated based on phatic acid/aminopropyltriethoxysilane(PA/APTES)hybrid coating.On the one hand,the CNNs/NWF wearable heater exhibited superb electrothermal behavior working at a peak temperature of 208.8℃powered with 2.0 V,better than that of wearable heaters in the recently reported literature.On the other hand,the vertical burning test showed that the heater possesses splendid flame retardancy.Furthermore,the PA/APTES coating could deposit a nanoscale porous protective film on the surface of CNNs/NWF,which imparts the heater with relatively excellent oxidation resistance and breathability.In addition,the antibacterial efficiency against Escherichia coli(E.coli)and Staphylococcus aureus(S.aureus)still reached100%after 50 times of standard washing and being electrified at 2.0 V for 5 min,keeping humans away from the threat of bacterial infections.We think that the heater in this research could be extended to wearable heating devices.展开更多
Passive radiative thermal management holds substantial potential for enhancing energy efficiency and sustainability.However,few research efforts have addressed the integration of mechanical robustness and durability w...Passive radiative thermal management holds substantial potential for enhancing energy efficiency and sustainability.However,few research efforts have addressed the integration of mechanical robustness and durability with the distribution and composition of photonic structures within materials.Silk fibers,known for their distinctive hierarchical morphological structure,offer a solution to these challenges by providing exceptional optical and mechanical properties.Inspired by this,we developed a silk-like tough metafiber(PMABF)that incorporated multiple scatterers through a multi-scale structural construction of nanofiber aggregates and molecular interface engineering.We show that fabrics woven with PMABF can provide high midinfrared(MIR)emissivity(98.6%)within the atmospheric window and 86.7%reflectivity in the solar spectrum,attributed to its ellipsoidal photonic structure featuring by surface micro-/nano-particles and numerous internal voids.Through mature and scalable industrial manufacturing routes,our metafibers show excellent mechanical strength,hydrophobicity and thermal stability while maintaining effective passive radiative cooling.Practical application tests demonstrated that molecules introduced during the heterogeneous composite process significantly enhanced the metafiber’s tensile strength(125%)and compressive stress(261.5%)by forming junction welds among the nanofiber backbones to efficiently distribute the external forces.Furthermore,the superior thermal stability and flexibility of PMABF open abundant opportunities for diverse applications with demanding thermal management requirements,such as thermal protection and multi-scenario thermal camouflage.展开更多
基金financially supported by the National Key Research and Development Program(No.2017YFB0309400)the Technology Innovation Center of Hebei for fiber material(No.SG2020022)the National Innovation Center of Advanced Dyeing and Finishing Technology(No.ZJ2021A13)。
文摘Currently,there is an imperative demand for developing a novel flexible heater with high adhesion,breathability,and extreme condition resistance,such as ultra-high temperatures and even fire.Herein,a high-adhesion,flame-retardancy,and anti-bacteria copper nanoparticles networks/nylon 6 woven fabric(CNNs/NWF)wearable heater with a“sandwich-like”structure has been designed and fabricated based on phatic acid/aminopropyltriethoxysilane(PA/APTES)hybrid coating.On the one hand,the CNNs/NWF wearable heater exhibited superb electrothermal behavior working at a peak temperature of 208.8℃powered with 2.0 V,better than that of wearable heaters in the recently reported literature.On the other hand,the vertical burning test showed that the heater possesses splendid flame retardancy.Furthermore,the PA/APTES coating could deposit a nanoscale porous protective film on the surface of CNNs/NWF,which imparts the heater with relatively excellent oxidation resistance and breathability.In addition,the antibacterial efficiency against Escherichia coli(E.coli)and Staphylococcus aureus(S.aureus)still reached100%after 50 times of standard washing and being electrified at 2.0 V for 5 min,keeping humans away from the threat of bacterial infections.We think that the heater in this research could be extended to wearable heating devices.
基金supported by the National Natural Science Foundation of China(NO.22176031)the Fundamental Research Funds for the Central Universities and Graduate Student Innovation Fund of Donghua University(CUSF-DH-D-2023029).
文摘Passive radiative thermal management holds substantial potential for enhancing energy efficiency and sustainability.However,few research efforts have addressed the integration of mechanical robustness and durability with the distribution and composition of photonic structures within materials.Silk fibers,known for their distinctive hierarchical morphological structure,offer a solution to these challenges by providing exceptional optical and mechanical properties.Inspired by this,we developed a silk-like tough metafiber(PMABF)that incorporated multiple scatterers through a multi-scale structural construction of nanofiber aggregates and molecular interface engineering.We show that fabrics woven with PMABF can provide high midinfrared(MIR)emissivity(98.6%)within the atmospheric window and 86.7%reflectivity in the solar spectrum,attributed to its ellipsoidal photonic structure featuring by surface micro-/nano-particles and numerous internal voids.Through mature and scalable industrial manufacturing routes,our metafibers show excellent mechanical strength,hydrophobicity and thermal stability while maintaining effective passive radiative cooling.Practical application tests demonstrated that molecules introduced during the heterogeneous composite process significantly enhanced the metafiber’s tensile strength(125%)and compressive stress(261.5%)by forming junction welds among the nanofiber backbones to efficiently distribute the external forces.Furthermore,the superior thermal stability and flexibility of PMABF open abundant opportunities for diverse applications with demanding thermal management requirements,such as thermal protection and multi-scenario thermal camouflage.
