Jiawei Huang,Weifeng Chen,Qiyan Kuang,Ting Xiao,Lihua Jiang,Xinyu Tan,Yizhu Lei
Passive radiative cooling technologies are crucial for energy conservation and emission reduction, yet their development encounters substantial challenges. In this study, we fabricate an advanced passive radiative cooling emitter by coating BaSO4@SiP/H-SiO2@PAN on an aluminum substrate. This design highlights a remarkable average temperature reduction of 20.1 °C and an ultrahigh cooling power of 121.0 W m−2 under strong solar radiation, showcasing exceptional sub-ambient cooling performance. Through meticulous design optimization, the emitter exhibits an efficient reflectance of 95.5% in the visible spectrum and a superior mid-infrared emissivity of 97.9%. Additionally, the emitter's superhydrophobic surface, characterized by a water contact angle (WCA) of 155°, ensures excellent self-cleaning properties. Furthermore, its performance remains stable even after prolonged UV exposure, demonstrating its outstanding durability. This innovative emitter provides a critical solution for energy-efficient cooling in buildings and outdoor equipment, significantly contributing to reduced energy consumption and carbon emissions.
Artificial cells are constructed from synthetic materials to imitate the biological functions of natural cells. By virtue of nanoengineering techniques, artificial cells with designed biomimetic functions provide alternatives to natural cells, showing vast potential for biomedical applications. Especially in cancer treatment, the deficiency of immunoactive macrophages results in tumor progression and immune resistance. To overcome the limitation, a BaSO 4 @ZIF-8/transferrin (TRF) nanomacrophage (NMΦ) is herein constructed as an alternative to immunoactive macrophages. Alike to natural immunoactive macrophages, NMΦ is stably retained in tumors through the specific affinity of TRF to tumor cells. Zn 2+ as an “artificial cytokine” is then released from the ZIF-8 layer of NMΦ under tumor microenvironment. Similar as proinflammatory cytokines, Zn 2+ can trigger cell anoikis to expose tumor antigens, which are selectively captured by the BaSO 4 cavities. Therefore, the hierarchical nanostructure of NMΦs allows them to mediate immunogenic death of tumor cells and subsequent antigen capture for T cell activation to fabricate long-term antitumor immunity. As a proof-of-concept, the NMΦ mimics the biological functions of macrophage, including tumor residence, cytokine release, antigen capture and immune activation, which is hopeful to provide a paradigm for the design and biomedical applications of artificial cells.
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