Controlled fabrication and microwave absorbing mechanism of hollow Fe3O4@C microspheres

Hou, Yanhui; Yuan, Huan; Chen, Hang; Shen, Junhai; Li, Liangchao

doi:10.1007/s11426-016-9001-5

Cited by 19 publications

(7 citation statements)

References 32 publications

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“…The chemical shifts in the Fe 2p peaks and Au 4f peaks are probably caused by the transfer of charge carriers at the metal-oxide interfaces [ 83 , 84 , 85 ]. As shown in Figure 6 c, the O 1s spectrum of pure Fe 3 O 4 exhibits only a single peak at 532.8 eV, and no obvious shift of peak position is observed [ 86 ]. The survey scan results demonstrate that all the indexed peaks correspond to those of Fe, Au, O and C ( Figure 6 d).…”

Section: Resultsmentioning

confidence: 99%

Enhanced Catalytic Reduction of 4-Nitrophenol Driven by Fe3O4-Au Magnetic Nanocomposite Interface Engineering: From Facile Preparation to Recyclable Application

et al. 2018

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In this work, we report the enhanced catalytic reduction of 4-nitrophenol driven by Fe3O4-Au magnetic nanocomposite interface engineering. A facile solvothermal method is employed for Fe3O4 hollow microspheres and Fe3O4-Au magnetic nanocomposite synthesis via a seed deposition process. Complementary structural, chemical composition and valence state studies validate that the as-obtained samples are formed in a pure magnetite phase. A series of characterizations including conventional scanning/transmission electron microscopy (SEM/TEM), Mössbauer spectroscopy, magnetic testing and elemental mapping is conducted to unveil the structural and physical characteristics of the developed Fe3O4-Au magnetic nanocomposites. By adjusting the quantity of Au seeds coating on the polyethyleneimine-dithiocarbamates (PEI-DTC)-modified surfaces of Fe3O4 hollow microspheres, the correlation between the amount of Au seeds and the catalytic ability of Fe3O4-Au magnetic nanocomposites for 4-nitrophenol (4-NP) is investigated systematically. Importantly, bearing remarkable recyclable features, our developed Fe3O4-Au magnetic nanocomposites can be readily separated with a magnet. Such Fe3O4-Au magnetic nanocomposites shine the light on highly efficient catalysts for 4-NP reduction at the mass production level.

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Section: Resultsmentioning

confidence: 99%

Enhanced Catalytic Reduction of 4-Nitrophenol Driven by Fe3O4-Au Magnetic Nanocomposite Interface Engineering: From Facile Preparation to Recyclable Application

et al. 2018

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“…To further reveal the microwave absorption properties of the Fe 3 O 4 composites, the reflection loss R was analyzed by comparing known literature data of Fe 3 O 4 particles [10][11] and obtained experimental data. A comparison of the reflection coefficient data presented as spectra are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Dynamic Arrays Based on Magnetically Controlled Particles: Synthesis and Application

Шорсткий

2019

Mat. Res.

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Growth mechanisms of dynamic granular arrays based on magnetically controlled particles are presented. Method of the external rotating magnetic field (ERMF), based on a dipole interaction of magnetic spherical Fe 3 O 4 particles in highly ordered volume arrays is proposed and a design for its practical implementation is developed. The magnetic assembly can result in permanent structures, which could be disassembled on demand by remote demagnetization. To study the interaction field of particles in the arrays, a mean field theory was used and the data were compared with experiment. Reflection spectra of electromagnetic radiation from a volume dense packed array of Fe 3 O 4 particles with thicknesses of 3 and 6 mm, and a flat particles array with a set of 15 and 30 layers, as well as frequency characteristics of attenuation of electromagnetic radiation of the claimed materials in the frequency range from 8.0 GHz to 12.5 GHz obtained. Presented method and the installation have the prospect of being used in the processes of making composite materials for electromagnetic radiation protection using a wide range of materials of micro and nanoparticles.

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“…To further reveal the microwave absorption properties of the Fe 3 O 4 composites, the reflection loss R was analyzed by comparing known literature data of Fe 3 O 4 particles [8][9][10] and obtained experimental data. A comparison of the reflection coefficient data presented as spectra is shown in Figure 5.…”

Section: Resultsmentioning

confidence: 99%

Dynamic arrays based on magnetically controlled Fe₃O₄ particles

Шорсткий

2018

MATEC Web Conf.

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Abstract. In this work, a new concept of dynamic granular arrays was proposed based on magnetically controlled particles. Method of external rotating magnetic field (ERMF), based on a dipole interaction of magnetic spherical Fe3O4 particles in highly ordered volume arrays is proposed. The microwave-absorbing characteristics results of developed composites offer an effective way to design high-performance functional materials to facilitate the research in electromagnetic shielding and microwave absorption.

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Controlled fabrication and microwave absorbing mechanism of hollow Fe3O4@C microspheres

Cited by 19 publications

References 32 publications

Enhanced Catalytic Reduction of 4-Nitrophenol Driven by Fe3O4-Au Magnetic Nanocomposite Interface Engineering: From Facile Preparation to Recyclable Application

Enhanced Catalytic Reduction of 4-Nitrophenol Driven by Fe3O4-Au Magnetic Nanocomposite Interface Engineering: From Facile Preparation to Recyclable Application

Dynamic Arrays Based on Magnetically Controlled Particles: Synthesis and Application

Dynamic arrays based on magnetically controlled Fe₃O₄ particles

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Controlled fabrication and microwave absorbing mechanism of hollow Fe3O4@C microspheres

Cited by 19 publications

References 32 publications

Enhanced Catalytic Reduction of 4-Nitrophenol Driven by Fe3O4-Au Magnetic Nanocomposite Interface Engineering: From Facile Preparation to Recyclable Application

Enhanced Catalytic Reduction of 4-Nitrophenol Driven by Fe3O4-Au Magnetic Nanocomposite Interface Engineering: From Facile Preparation to Recyclable Application

Dynamic Arrays Based on Magnetically Controlled Particles: Synthesis and Application

Dynamic arrays based on magnetically controlled Fe3O4 particles

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Product

Resources

About

Dynamic arrays based on magnetically controlled Fe₃O₄ particles