Magnetic and microwave absorption properties of FeNi3/NiFe2O4 composites synthesized by solution combustion method

Golchinvafa, S.; Masoudpanah, S.M.

doi:10.1016/j.jallcom.2019.02.039

Cited by 58 publications

(8 citation statements)

References 45 publications

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“…With respect to metal/metal oxide composites, Fe 3 O 4 , NiO, NiFe 2 O 4 , CoFe 2 O 4 composting with metal components are also reported to alleviate impedance match characteristic. [19][20][21][22] Meanwhile, the metal oxides introduction process is time-consuming, not to mention the density issue of such materials is getting worse. Up to now, reports on well-designed morphology and configuration to achieve lightweight and high-performance features simultaneously for metal-based EM wave absorbing materials are scarce.…”

mentioning

confidence: 99%

Lightweight Ni Foam‐Based Ultra‐Broadband Electromagnetic Wave Absorber

Qin

Zhang

Zhao

2021

Adv Funct Materials

302

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Skin effect and high density are the main reasons that restrict the search of lightweight and high-performance metal-based electromagnetic (EM) wave absorbing materials. Although nanostructured metal materials have been fabricated to solve above problems, poor dispersibility and chemical stability issues brought about by high surface energy due to existing nano-size effect. In this work, lightweight Ni foam with NiO/NiFe 2 O 4 in situ growth composites are fabricated by a facile and universal route as an effective alternative to high-performance metal-based EM wave absorber. Impressively, it is found that the foam structure and NiO/NiFe 2 O 4 /Ni components can synergistically boost EM wave absorption capacity. In detail, impedance matching from foam structure and energy dissipation from interfacial polarization and defect induced polarization provided by NiO/NiFe 2 O 4 mainly contributes to its ultra-broadband EM wave absorption performance. As a result, the as-prepared sample (0.06 g•cm −3 ) delivers a wide absorption bandwidth of 14.24 GHz and thin thickness of 0.6 mm, as well as, high specific effective absorption bandwidth of 19444.4 GHz•g −1 •cm −2 . This work sheds light on the novel view on the synergistic effect of structure and components on EM wave absorption behaviors and demonstrates a new pathway for preparation of lightweight and high-performance metal-based EM wave absorbers.

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mentioning

confidence: 99%

Lightweight Ni Foam‐Based Ultra‐Broadband Electromagnetic Wave Absorber

Qin

Zhang

Zhao

2021

Adv Funct Materials

302

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“…As shown in Figure c,d, however, RL min is only −15.0 dB at 8.7 GHz and the EAB is 3.9 GHz at 3.0 mm for NiFe 2 O 4 particles. In addition, the as-obtained 2D porous NiFe 2 O 4 exhibits superior absorbing properties compared with many nickel ferrites in the literature, as summarized in Table . − These results indicate that the unique 2D porous structure contributes a lot to such improved absorbing properties.…”

Section: Resultsmentioning

confidence: 76%

General Synthesis of Two-Dimensional Porous Metal Oxides/Hydroxides for Microwave Absorbing Applications

Chen

et al. 2021

Inorg. Chem.

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Metal oxides/hydroxides with a two-dimensional (2D) porous structure have extensive applications in catalysis, microwave absorption, and energy storage fields due to their large specific surface areas, massive exposed active sites, and good structural integrities. Herein, a general surfactant-assisted vapor diffusion–deposition self-assembly method is developed to synthesize various 2D porous metal oxides/hydroxides. Benefiting from the structure-directing effect of surfactants and the precise tuning of nucleation and growth process that results from this vapor diffusion–deposition strategy, a 2D porous structure is constructed. To explore the advantages of such 2D porous structure, electromagnetic characteristics and absorbing properties of as-obtained materials are investigated. The minimum reflection loss (RL) of 2D porous NiFe2O4 is −23.1 dB at 6.4 GHz, and the effective absorption bandwidth (EAB) is 5.1 GHz. However, the minimum RL is only −15.0 dB at 8.7 GHz and the EAB is 3.9 GHz for NiFe2O4 particles. In addition, the as-obtained 2D porous NiFe2O4 exhibits superior absorbing properties compared with many previously reported nickel ferrites. Furthermore, the microwave absorbing mechanism of 2D porous NiFe2O4 is investigated.

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“…Microwave heating was also used to prepare catalysts through a solution combustion method. Golchinvafa and Masoudpanah prepared a FeNi 3 /NiFe 2 O 4 composites through a solution combustion synthesis method, with conventional and microwave heating [59]. The composites with higher amounts of FeNi 3 phase and larger sintered particles (0.4-0.8 mm) were obtained through microwave heating.…”

Section: Hu Et Almentioning

confidence: 99%

Microwaves and Heterogeneous Catalysis: A Review on Selected Catalytic Processes

et al. 2020

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Since the late 1980s, the scientific community has been attracted to microwave energy as an alternative method of heating, due to the advantages that this technology offers over conventional heating technologies. In fact, differently from these, the microwave heating mechanism is a volumetric process in which heat is generated within the material itself, and, consequently, it can be very rapid and selective. In this way, the microwave-susceptible material can absorb the energy embodied in the microwaves. Application of the microwave heating technique to a chemical process can lead to both a reduction in processing time as well as an increase in the production rate, which is obtained by enhancing the chemical reactions and results in energy saving. The synthesis and sintering of materials by means of microwave radiation has been used for more than 20 years, while, future challenges will be, among others, the development of processes that achieve lower greenhouse gas (e.g., CO 2 ) emissions and discover novel energy-saving catalyzed reactions. A natural choice in such efforts would be the combination of catalysis and microwave radiation. The main aim of this review is to give an overview of microwave applications in the heterogeneous catalysis, including the preparation of catalysts, as well as explore some selected microwave assisted catalytic reactions. The review is divided into three principal topics: (i) introduction to microwave chemistry and microwave materials processing; (ii) description of the loss mechanisms and microwave-specific effects in heterogeneous catalysis; and (iii) applications of microwaves in some selected chemical processes, including the preparation of heterogeneous catalysts.A chemical process is conventionally energized by means of conductive heating with a steam boiler as a typical heat source. Nevertheless, a large variety of other forms of energy can be applied for PI, including ultrasounds (for reactions or crystal nucleation), light (in photocatalytic processes), electric fields (in extraction or for orientation of molecules), or microwaves. The microwave (dielectric) heating of materials has been known for a long time, and microwave ovens have been developed from more than 60 years. The studies by Gedye et al. in 1986 and 1988 [3,4] opened a period of very intensive investigation of the microwave effects on chemical reactions in homogeneous systems. Since then, hundreds of research papers have been published, and research has also expanded toward heterogeneous catalysis and its related chemical processes. This review gives an overview of the application of microwave technology to heterogeneous catalysis, including various chemical processes, as well as to the preparation of catalysts.

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Magnetic and microwave absorption properties of FeNi3/NiFe2O4 composites synthesized by solution combustion method

Cited by 58 publications

References 45 publications

Lightweight Ni Foam‐Based Ultra‐Broadband Electromagnetic Wave Absorber

Lightweight Ni Foam‐Based Ultra‐Broadband Electromagnetic Wave Absorber

General Synthesis of Two-Dimensional Porous Metal Oxides/Hydroxides for Microwave Absorbing Applications

Microwaves and Heterogeneous Catalysis: A Review on Selected Catalytic Processes

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