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Designed Fabrication and Characterization of Three-Dimensionally Ordered Arrays of Core–Shell Magnetic Mesoporous Carbon Microspheres

Yuan, Kaiping, Che, Renchao, Cao, Qi, Sun, Zhenkun, Yue, Qin, Deng, Yonghui
ACS Applied Materials & Interfaces 2015 v.7 no.9 pp. 5312-5319
absorption, carbon, iron oxides, porous media, silica
A confined interface coassembly coating strategy based on three-dimensional (3-D) ordered macroporous silica as the nanoreactor was demonstrated for the designed fabrication of novel 3-D ordered arrays of core–shell microspheres consisting of Fe₃O₄ cores and ordered mesoporous carbon shells. The obtained 3-D ordered arrays of Fe₃O₄@mesoporous carbon materials possess two sets of periodic structures at both mesoscale and submicrometer scale, high surface area of 326 m²/g, and large mesopore size of 19 nm. Microwave absorption test reveals that the obtained materials have excellent microwave absorption performances with maximum reflection loss of up to −57 dB at 8 GHz, and large absorption bandwidth (7.3–13.7 GHz, < −10 dB), due to the combination of the large magnetic loss from iron oxides, the strong dielectric loss from carbonaceous shell, and the strong reflection and scattering of electromagnetic waves of the ordered structures of the mesopores and 3-D arrays of core–shell microspheres.