Enhanced microwave absorption properties of carbonyl iron/Fe3O4 composites synthesized by a simple hydrothermal method

Liu, Qiangchun; Zi, Zhenfa; Zhang, Min; Pang, Angbo; Dai, Jianming; Sun, Yan

doi:10.1016/j.jallcom.2013.02.007

Cited by 56 publications

(17 citation statements)

References 36 publications

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“…Some of them include electrochemical method [11], laser pyrolysis [12], microemulsion synthesis [13], and hydrothermal technique [14]. In this work, we report the preparation of γ-Fe 2 O 3 nanocrystallites by co-precipitation chemical procedure.…”

Section: Introductionmentioning

confidence: 99%

“…In this work, we report the preparation of γ-Fe 2 O 3 nanocrystallites by co-precipitation chemical procedure. This method is chosen because of the lower temperatures required to the synthesis compared to other techniques such as hydrothermal technique [14] which require interval of temperature from 130˚C to 250˚C and high vapor pressure (from 0.3 to 4 MPa). On the other hand, in our previous report [15], we studied the intermediate super paramagnetic relaxation effect of γ-Fe 2 O 3 nanoparticles by Mössbauer spectroscopy at different temperatures.…”

Section: Introductionmentioning

confidence: 99%

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Structural and Magnetic Properties of Monophasic Maghemite (γ-Fe2O3) Nanocrystalline Powder

Ramos-Guivar¹,

Martı́nez²,

Anaya³

et al. 2014

ANP

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Structural and magnetic studies of monophasic maghemite (γ-Fe2O3) magnetic nanocrystallites (MNCs) synthesized by the co-precipitation chemical route are reported in this paper. For the synthesis, a starting precursor of magnetite (Fe3O4) in basic medium was oxidized at room temperature by adjusting the pH = 3.5 at 80˚C in an acidic medium without surfactants. X-ray diffraction (XRD) pattern shows widened peaks indicating nanometric size and Rietveld Refinement confirms only one single-phase assigned to γ-Fe2O3 MNCs. High Resolution Transmission Electron Microscopy (HR-TEM) demonstrates the formation of nanoparticles with diameter around D ≈ 6.8 ± 0.1 nm which is in good agreement with Rietveld Refinement (6.4 ± 1 nm). A selected area electron diffraction pattern was carried out to complement the study of the crystalline structure of the γ-Fe2O3 MNCs. M(H) measurements taken at different temperatures show almost zero coercivity and remanence indicating superparamagnetic domain and high magnetic saturation.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Structural and Magnetic Properties of Monophasic Maghemite (γ-Fe2O3) Nanocrystalline Powder

Ramos-Guivar¹,

Martı́nez²,

Anaya³

et al. 2014

ANP

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“…By simulating the absorbing properties of multi-layer composites composed of electromagnetic parameter layers with different thicknesses, the structure of composites with the best absorbing properties was obtained and then used to guide the experiment. [23], and no γ-Fe 2 O 3 peak is observed, indicating that there is no γ-Fe 2 O 3 in the material system [21][22][23][24][25], thereby further confirming that the oxide loaded on the surface of rGO is magnetite Fe 3 O 4 [24][25][26][27][28][29]. [30,31], indicating that rGO is reduced by ascorbic acid, but not completely.…”

Section: Emw Absorbing Property Testmentioning

confidence: 85%

Preparation and properties of functional particle Fe₃O₄-rGO and its modified fiber/epoxy composite for high-performance microwave absorption structure

Xue

et al. 2020

Mater. Res. Express

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Microwave absorbing materials have been becoming a countermeasure and security media for radio environment, and also been becoming the main military force attached by the world. In this study, experimental data, theoretical researches and FEKO-a 3D structure and electromagnetic field analysis simulation tool, namely, FEldberechnung bei Korpern mit beliebiger Oberflache, are effectively combined. Through systematic studies on electromagnetic parameters and microwave absorbing properties of high-performance absorbing functional particle Fe 3 O 4 -rGO (i.e. reduced graphene oxide), single-layer composite Fe 3 O 4 -rGO@EP/GF (epoxy/glass fiber) and multi-layer structure composite Fe 3 O 4 -rGO@EP/fiber, combined with the simulation calculations of material structures, design on the microwave absorption performances of fiber/resin structural composites is achieved. In particular, under the guidance of FEKO simulations, a multi-layer structure composite with two layers of Fe 3 O 4 -rGO@EP/GF with different Fe 3 O 4 -rGO added amounts as the absorbing layer and carbon fiber (CF) reinforced EP as the reflecting layer is prepared, which has an effective absorption bandwidth of 8. 43-12.40 GHz, almost covering the whole X-band, and RL min (minimum reflection loss) up to −34.60 dB at 10.37 GHz. The relevant experimental results are basically consistent with the FEKO simulation results. This study is helpful to improve the developing efficiencies and properties of microwave absorbing structure composites with both excellent mechanical properties and outstanding microwave absorbing performances, especially conducive to industrial productions. absorption intensity was −31.0 dB at −9.9 GHz. Se-Won Eun et al [2] produced the tested material glass/EP-MWCNT and introduced the 'split sample' test method, which, used to measure the reflection and absorption to electromagnetic waves, could analyze quantitatively the effects of layering by implementing layering with different thickness and position in the same sample, test results showed that the minimum reflection loss (RL min ) of the material prepared was −52.9 dB, resonance occurring at 10.01 GHz, and the effective absorption bandwidth was 8.3-12.4 GHz, almost covering the whole X-band. In addition, the effects of fiber lamination angle [3], pulp modification degree [4,5] and special hollow fiber [6] on the microwave absorbing properties of composites were studied too. used self-assembly technology to manufacture broadband periodic structural absorbing material with GO solution and PP fabric, through coupling multiple resonances and edge diffraction, the periodic structure absorbing material prepared had more than 90% absorption in the whole measurement frequency range (2-40 GHz, 75-110 GHz); in addition, it showed high absorption intensity (RL <−15 dB) over a wide frequency range (62.73 GHz). Wei-Li Song et al [8] accelerated the design of highefficiency microwave absorbing dielectric composites by allowing attenuation evaluation diagrams; based on this, combined with CST simul...

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“…assign to Fe 3 O 4 ), but that to Fe crystalline [2θ at about 44 and 65° assigned to (110), (200), and (211) planes of α ‐Fe, respectively] could be observed. This means that the oxidation did not occur during supercritical treatment . It is reasonable, for the procedure was carried out in a sealed autoclave.…”

Section: Resultsmentioning

confidence: 99%

Surface modification of carbonyl iron powders with silicone polymers in supercritical fluid to get higher dispersibility and higher thermal stability

Huang

Wang

Yin

et al. 2016

Surf. Interface Anal.

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The surface of carbonyl iron powder (CIP) was modified in supercritical fluid with silicone polymers containing reactive Si‐OCH3 groups. Fourier‐transformed infrared spectroscopy, X‐ray photoelectron spectroscopy, X‐ray diffraction, and thermo gravimetric analysis were adopted to characterize CIP. The dispersibility of CIP in epoxy resin matrix was evaluated by castor oil absorption factor, dynamic viscosity, Mooney viscosity, and scanning electric micrograph. The electromagnetic reflectivity of the CIP‐filled epoxy resin coatings was also checked. It was confirmed that comparing with those treated at atmosphere, the supercritical treated CIP presented higher surface carbon content, higher dispersibility, higher thermal stability, and its original crystalline structure did not change greatly. Even though it experienced a high temperature and a high pressure (250 °C, 7.8 Mpa) during supercritical treatment, it was not oxidized, and its electromagnetic reflectivity did not decrease. Copyright © 2016 John Wiley & Sons, Ltd.

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Enhanced microwave absorption properties of carbonyl iron/Fe3O4 composites synthesized by a simple hydrothermal method

Cited by 56 publications

References 36 publications

Structural and Magnetic Properties of Monophasic Maghemite (<i>γ</i>-Fe<sub>2</sub>O<sub>3</sub>) Nanocrystalline Powder

Structural and Magnetic Properties of Monophasic Maghemite (<i>γ</i>-Fe<sub>2</sub>O<sub>3</sub>) Nanocrystalline Powder

Preparation and properties of functional particle Fe₃O₄-rGO and its modified fiber/epoxy composite for high-performance microwave absorption structure

Surface modification of carbonyl iron powders with silicone polymers in supercritical fluid to get higher dispersibility and higher thermal stability

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Enhanced microwave absorption properties of carbonyl iron/Fe3O4 composites synthesized by a simple hydrothermal method

Cited by 56 publications

References 36 publications

Structural and Magnetic Properties of Monophasic Maghemite (&lt;i&gt;γ&lt;/i&gt;-Fe&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt;) Nanocrystalline Powder

Structural and Magnetic Properties of Monophasic Maghemite (&lt;i&gt;γ&lt;/i&gt;-Fe&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt;) Nanocrystalline Powder

Preparation and properties of functional particle Fe3O4-rGO and its modified fiber/epoxy composite for high-performance microwave absorption structure

Surface modification of carbonyl iron powders with silicone polymers in supercritical fluid to get higher dispersibility and higher thermal stability

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Structural and Magnetic Properties of Monophasic Maghemite (<i>γ</i>-Fe<sub>2</sub>O<sub>3</sub>) Nanocrystalline Powder

Structural and Magnetic Properties of Monophasic Maghemite (<i>γ</i>-Fe<sub>2</sub>O<sub>3</sub>) Nanocrystalline Powder

Preparation and properties of functional particle Fe₃O₄-rGO and its modified fiber/epoxy composite for high-performance microwave absorption structure