Developing lightweight, high-performance microwave absorbing materials with multiple functions has become a major challenge in the field of electromagnetic protection. In this study, ZIF-67/cellulose nanofiber (CNF)-derived Co–C/C aerogel with an integrated design for microwave absorption and thermal camouflage functions was prepared. The hierarchical pore structure with coexisting micron-scale skeletal pores and MOF-derived nanopores was constructed through in-situ growth of ZIF-67 on CNF and low-temperature carbonization regulation. Simultaneously, uniformly distributed Co nanoparticles (20–30 nm) and defect-rich graphitized carbon heterointerfaces were obtained. The Co–C/C aerogel exhibited an ultra-low density (16.21–17.35 mg/cm 3 ). In terms of microwave absorption, it achieved an effective absorption bandwidth of 6.87 GHz (covering the Ku band) at a thickness of 2.4 mm. This was attributed to the synergistic mechanisms of multiple scattering from hierarchical pores, enhanced interfacial polarization induced by low-temperature carbonization, and magnetic loss from Co nanoparticles. In addition, the material demonstrated a low thermal conductivity of 0.0492 W m −1 K −1 , and infrared imaging revealed its significant thermal signal shielding capability. This study addressed the issues of structural collapse and functional singleness in traditional MOF-derived materials through in-situ growth and low-temperature carbonization strategies, providing new insights for the design of lightweight, broadband, and multifunctional stealth materials.
This paper reports the first Pickering high internal phase emulsion (HIPE) system stabilized solely by worm-like nanoaggregates. The cross-linked worms were prepared from the dispersion polymerization of benzyl methacrylate (BzMA), with poly(dimethylamino ethyl methacrylate) (PDMA) macro-CTA as the stabilizer and ethylene glycol dimethacrylate (EGDMA) as the cross-linker, through polymerization-induced self-assembly (PISA). The effects of the internal phase type and volume, as well as the worm concentration on the stability of the resulting Pickering HIPEs were investigated. Furthermore, by adding a small amount of silica nanoparticles or magnetic nanoparticles as the binder in the continuous aqueous phase, followed by freeze-drying, 3D hierarchical porous monoliths of ultralow density were successfully prepared. This work demonstrated that Pickering HIPE templating provides a facile approach for the preparation of ultra-light functional hybrid porous materials, which have good potential in various application areas.
危险品化学品经营许可证（带存储）