High Frequency Absorption of PVC/Iron Oxides and PVC/CoFe$_{2}$O$_{4}$/CoO Nanofibers Produced by Electrospinning Technique

Fe‐, Co‐, and Ni‐Loaded Porous Activated Carbon Balls as Lightweight Microwave Absorbents

“…Therefore, parameters of e r and m r are taken into account to uncover the intrinsic microwave absorptionm echanism of the FeCB, CoCB and NiCB composites. The relative complex permittivity of the composites is shown in Figure 7a frequencies, and then tend to stabilizew ith little variation in the high-frequency region,t hus showingf requency dependence over the whole frequency range (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18). This is distinctive frequencyd ispersion behavior, which exists extensively in pristine carbon materials and carbon-based materials, [19,48] and is reported to enhance microwave absorbingc apacities.…”

“…As depictedi nF igure 11,c ombining the data in Ta ble 3, the minimum RL values are À21.2, À20.6, and À23.7 dB for FeCB800, CoCB800, and NiCB800 with concentrations of precursors olution of 1.5, 1, and 0.5 m,r espectively. The matching frequency (f m ), corresponding to the minimum absorption dip, is mainly distributed in the Ku band (12)(13)(14)(15)(16)(17)(18). The effective bandwidth of FeCB800, CoCB800, and NiCB800 reaches 4.4, 4.2, and 4.1 GHz when the concentration of the precursor solution is 0.5, 1.5, and 1 m.T hese results imply that the microwavea bsorption can be adjusted by changing the loading amount of the magnetic constituents in the PACB composites.…”

“…[5][6][7] As is well known, the high density and low specific surface area are the typical weaknesses of traditional magnetic and dielectric absorbents, including carbonyl-iron, [8] BaFe 12 O 19 , [9] Fe, [10] TiO 2 , [11] MnO 2 , [12] and BaTiO 3 [13] .Itisstill achallenge to discover lightweight magnetic materials. As ar esult, recently, ac onsiderable number of studies have been devoted to combining materials with different loss properties, such as Fe/ SiO 2 , [14] ZnO@Ni, [15] polyaniline-CoFe 2 O 4 , [16] PVC/CoFe 2 O 4 / CoO, [17] and Fe 3 O 4 @TiO 2 . [18] Carbon materials have received intensivea ttention and have been extensively explored as typical dielectric absorbents, owing to their tunable properties, relative low density,h igh electric conductivity,a bundance,e asy preparation, and low cost.…”

γ-Fe2O3–MWNT/poly(p-phenylenebenzobisoxazole) composites with excellent microwave absorption performance and thermal stability

“…6 In addition, the special structure and size effects contribute to their excellent electrical conductivity and mechanical properties, 7 which facilitate their application in the microwave absorbing eld. have been reported in different matrices (polyaniline, phenolic resin, carbon matrix and PVC), [12][13][14][15] seldom have the magnetic properties and microwave absorbability of g-Fe 2 O 3 loaded CNTs absorbers been reported. Therefore, synthetic strategies have been proposed to prepare CNTs composites with ferromagnetism and good conductivity by either interior lling or exterior coating with magnetic particles.…”

A cost effective solution for development of broadband radar absorbing material using electronic waste

“…Researchers have studied numerous composites for various electromagnetic applications [7,8]. But, few have paid attention over waste composite material to be used for X-band frequency range especially for defence based applications.…”