Co3Fe7/C core–shell microspheres as a lightweight microwave absorbent

Distinct plasmon resonance enhanced microwave absorption of strawberry-like Co/C/Fe/C core–shell hierarchical flowers via engineering the diameter and interparticle spacing of Fe/C nanoparticles

“…9a and b), respectively. These values are signicantly higher than those of the Co 3 Fe 7 /C coreshell microspheres (m 00 : À0.1-0.05), 33 FeCo/C core-shell NPs (m 00 : 0.2-1.5) 58 and FeCo microspheres (m 00 : 0.05-0.19). 32 The high m 0 and m 00 values correspond to the high storage and loss capacities, respectively, of the magnetic energy.…”

“…3 0 and 3 00 initially increase and subsequently decrease with increasing d. 3 0 and 3 00 varied in the ranges of À27.3-143.5 and À0.19-433.8, respectively, and reach their maximum at d ¼ 3-4 mL (3 0 : À27.3 to 143.5; 3 00 : 39.8 to 433.8). These values are À3-15 times and À50 091-7666 times those of the Co HFs (3 0 : 9.0-9.7; 3 00 : À0.19-0.05) and are much higher than those of Co 3 Fe 7 /C core-shell microspheres (3 0 : 12-25; 3 00 : 8-17), 33 FeCo@C coreshell NPs (3 0 : 2-12.5; 3 00 : 1-4) 58 and FeCo microspheres (3 0 : 4.4-4.8; 3 00 z 0.5). 32 The high 3 0 and 3 00 values correspond to the high storage and loss capacities, respectively, of the electric energy for Co/C/Fe/C CSHFs.…”

“…(4) According to the equation m 00 ¼ M s /3m 0 H A a, 19 combining Co with Fe can realize a high M s and can enhance permeability. 17 To date, Co-based composites, such as CNTs/ Co@C, 3 Co@C, 28 Co/CoO nanobers, 29 FeCo/graphene, 30 FeCo/ C composites, 2 FeCo/C nanobers, 31 FeCo microspheres, 32 Co 3 Fe 7 /C microspheres, 33 FeCo nanoparticle/nano porous carbon, 34 FeCo nanochains 35 and Co 7 Fe 3 and Co 7 Fe 3 @SiO 2 nanospheres, 1 have been synthesized via electrospinning, facial wet-chemical route, solvothermal method, arc-discharge technique and liquid-phase reduction. However, few studies have investigated the synthesis and EM performance of Co/C/Fe/C core-shell hierarchical owers (CSHFs) with a strawberry-like surface.…”

Synthesis and Microwave Absorption Properties of Fe-Loaded Fly Ash-Based Ceramic Composites

“…62 In particular, some of the negative μ″ values of all the specimens appear in Figure 10b. According to the relevant reports, 63 it is speculated that the magnetic energy would be radiated out from FeFA composites, and the source of radiated energy is from the motion of charges under the alternative electric field, in which the magnetic field will be induced by an alternative electric field and be radiated out. This phenomenon may also be explained well by the Maxwell theory.…”

Carbon-coated CoFe–CoFe2O4 composite particles with high and dual-band electromagnetic wave absorbing properties

“…During the annealing process, the microstructure evolution and corresponding electromagnetic behavior were investigated, and the quantitative relationship between the two was established preliminarily. Two-step solvothermal processes were utilized to synthesize CoFe 2 O 4 @C particles [18]. In a typical process, 2 mmol of FeCl 3 •6H 2 O and 1 mmol of CoCl 2 •6H 2 O were dissolved into 60 ml of ethylene glycol before 10 mmol of NaAc was added into the mixed solution.…”