Silica-coated iron nanocubes: Preparation, characterization and application in microwave absorption

Enhanced electromagnetic characteristics of carbon nanotubes/carbonyl iron powders complex absorbers in 2–18GHz ranges

“…4c). Moreover, the absorption range under −10 dB was in the whole frequency range (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18). This indicates that the aforesaid CNTs/CIPs composites are excellent absorber with strongabsorption and broad-bandwidth.…”

“…Hereinto, carbonyl iron powders (CIPs) have been widely used as conventional EM-wave absorbing materials due to their low price, high specific saturated magnetization, and Snoek's limit [4][5][6][7][8]. However, unavoidable disadvantage of overweight makes them very difficult to meet the need of lightness for the absorption coating.…”

“…In comparison with the single-layer absorption coatings, the multi-layer absorption coatings with special structures can significantly enhance the matching and absorbing properties, but their complicated structures generally not only raise the cost but also present the construction technology with difficulties. By contrast, the adjustment of the EM parameters by employing hybrid-type absorbers and/or mixed-type absorbers can conveniently achieve the single-layer absorbing coatings with excellent absorbing properties and simplicity workmanship [5,8]. Until now, some compounding techniques, including mixing, coating, and alloying, were applied to fabricate complex absorbents, such as the composite of magnetic loss absorber and EM-wavetransparent materials (e.g., Fe/SiO 2 [5][6][7][8], Fe/Al 2 O 3 [9], Fe/ZnO [10]), the magnetic loss/dielectric loss complex absorber (e.g., FeNiMo/C nanocapsules [11], Fe-Ni alloy/C nanotubes [12], Fe/C nanotubes [13]), and the magnetic loss/magnetic loss complex absorber (e.g., Fe/Ni [14], Fe/Fe 2 O 3 [15], Fe powders/Fe nanofibers [16]).…”

“…Among them, the insulating nanomaterials (e.g., SiO 2 , Al 2 O 3 , ZnO, etc.) with low permittivity, on the surface of the metallic iron particles, can suppress the eddy current loss [7,8]. This may expand the effective bandwidth at the expense of the low-frequency absorption properties.…”

Fluorescent magnetic nanoprobes: Design and application for cell imaging

“…are required. Also, silica has already served as candidate to encapsulate nanoprobes because of its stability, biocompatibility, easy functionalization, and low cytotoxicity [21][22][23][24][25][26][27].…”