Multifunctional Bulk Hybrid Foam for Infrared Stealth, Thermal Insulation, and Microwave Absorption

Abstract

Taking serious microwave pollution issues and the complex application environment into consideration, it is quite urgent to integrate several functions into one material. Electromagnetic (EM) absorbing materials with multiple functions are highly attractive to next-generation wireless techniques and portable electronic devices. Herein, melamine foam provides a decent platform for the uniform growth of Co-based metal− organic frameworks (MOFs), which bring the as-obtained hybrid foam with threedimensional porous network structure and combination of dielectric along with magnetic attenuation abilities as advanced materials in multifunctional fields. Remarkably, the relevant microwave absorption (MA) performance of the hybrid foam can reach an extremely high reflection loss value of −59.82 dB. Furthermore, the hybrid foam exhibits excellent infrared stealth and optimiztic heat insulation function, demonstrating the potential in plenty of practical applications. These results may arouse interests and inspirations of the elaborately design and facilely synthesis of highperformance foamlike microwave absorbers with multiple functions.

Carbon-Based MOF Derivatives: Emerging Efficient Electromagnetic Wave Absorption Agents

“…As depicted in Fig. 11 , Gu et al prepared Co/C composites with 3D porous network structure by deriving melamine foam@ZIF-67 [ 119 ]. The porosity and conductivity of the products could facilitate the enhancement of dielectric loss.…”

Environmentally Friendly and Multifunctional Shaddock Peel-Based Carbon Aerogel for Thermal-Insulation and Microwave Absorption

“…Liu et al prepared MXene/polyimide aerogels with splendid thermal insulation and resistance performance, which can be used as ideal candidates in high-temperature working environment [ 15 ]. In addition, our group previously fabricated three-dimensional ZIF-67-coated melamine foams with excellent thermal infrared stealth property, effectively preventing targets from being detected [ 16 ]. More importantly, Chen and his co-workers synthesized mesoporous carbon fibers and used computer simulation technology (CST) to simulate important radar cross-sectional (RCS) reduction data, this greatly contributes to the pre-design of macrostructure and pre-choice of materials [ 17 ].…”

Extending effective microwave absorbing bandwidth of CoNi bimetallic alloy derived from binary hydroxides

“…Figure 3 a–c exhibit the electromagnetic parameters of CNA800/900/1000 samples, including ε′ , ε″ , μ′ , and μ″, respectively, which represent the real and imaginary parts of permittivity and permeability. As a rule, the real parts represent the storage performance of electrical and magnetic energy, while the imaginary parts signify the dissipation capacity of microwave energy 21 . CNA800 exhibits the lowest relative electromagnetic parameters among all the as-prepared composites with the same filling ratio.…”