Journal
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
Volume 177, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2023.107884
Keywords
POSS-derived SiO 2 /C composite; Microwave absorption; Infrared stealth; Flame retardant
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This study presents a porous nickel nanoparticle supported on silica/carbon composite material, which exhibits strong and broadband microwave absorption. The optimized composite material shows excellent absorption performance at ultra-low filling ratio and possesses multiple properties.
It remains a great challenge for magnetic/carbon-based microwave absorbers to achieve both strong and broadband absorption, especially at ultra-low filling ratio. Herein, nickel nanoparticles supported on porous silica/carbon composite (Ni@SiO2/C) derived from POSS was prepared by a facile method. The carbonized Ni@SiO2/C composite offers the following advantages: i) the three-dimensionally porous POSS-derived SiO2/C skeleton provides electron transport paths and enhances conductive dissipation; ii) the porous magnetic/carbon composite provides interfacial polarization to enhance dielectric loss and forms strong magnetic coupling network to enhance magnetic loss; iii) multiple reflections and scattering between the porous framework enhance electromagnetic waves attenuation. Notably, the optimized Ni15@SiO2/C750 achieves high reflection loss of-58.5 dB, and broad effect absorption bandwidth of 8 GHz with a thickness of 2 mm at an ultra-low filling ratio of 3 wt%. Besides, the Ni15@SiO2/C750 has multiple properties of infrared stealth, flame retardancy, and water resistance.
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