Study on the Absorption Properties of Spinel Type Ferrite Composite Coatings in the Low Frequency

Wang, Wen Jie; Jiao, Qing; Zang, Chong Guang; Zhu, Xiang Dong

doi:10.4028/www.scientific.net/amr.415-417.30

Cited by 10 publications

(11 citation statements)

References 9 publications

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“…It is informative to compare the imaginary permittivity of the ferrite/ PANI composite with those reported in literature. Our previous research on spinel type ferrite composite absorbing coatings 33 showed the maximum imaginary part of permittivity to be 1.6, which had the same weight fraction of ferrite in wax as our present study. Thus, in order to obtain a better absorbing material, the weight percent of polyaniline should be bigger than 60.89%.…”

Section: Journal Of Materials Chemistry C Papersupporting

confidence: 80%

“…In the present work, we choose Mn 0.5 Zn 0.5 Fe 2 O 4 as the magnetic nanoparticle because it has shown a signicantly larger permittivity and better magnetic property than other spinel ferrites. 33 We demonstrate the synthesis of the unique structure of ferrite-on-polyaniline nanocomposite by the in situ emulsion polymerization with HCl as a dopant. The chemical interactions and dispersions between these ferrite nanoparticles and polyaniline nanobers, and the thermal resistance and dielectric properties of the resulting nanocomposites were investigated.…”

Section: Introductionmentioning

confidence: 98%

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Ferrite-grafted polyaniline nanofibers as electromagnetic shielding materials

et al. 2013

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A functional structure of Mn 0.5 Zn 0.5 Fe 2 O 4 -on-polyaniline nanocomposites with high dielectric absorbing properties and electromagnetic shielding effectiveness at low frequencies was successfully fabricated through a facile in situ emulsion polymerization. Polyaniline (PANI) was doped with hydrochloric acid to improve its electrical properties and interactions with ferrite nanoparticles. The electrostatic force, paramagnetic force and hydrogen bonding strongly bonded or assembled ferrite nanoparticles on the polyaniline surface and improved the thermal stability of the polyaniline nanostructure. Polyaniline nanofibers were found to have an average diameter of 100 nm and length of 500 nm, consisting of a bundle of smaller individual units, whereas ferrite nanoparticles were of spherical shape with an average diameter 30 nm. The research findings show that ferrite particles overcome the common problem of aggregation and evenly dispersed on the surface of polyaniline. The ferrite-grafted polyaniline nanostructures were demonstrated as a promising functional material for the absorbing of electromagnetic microwaves because of a large amount of dipole polarizations in the polymer backbone and at the interfaces of the ferrite nanoparticles and polyaniline nanofibers. Both the complex permittivity and shielding effectiveness of the ferrite-grafted polyaniline nanocomposites increased with the increasing weight percentage of PANI. There is also a good match of real and imaginary parts of the complex permittivity, giving rise to almost an equal dielectric loss angle tangent in the measured frequency (30 MHz to 1 GHz). This superior property allows the nanocomposites to function within an extended absorbing band.

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Section: Journal Of Materials Chemistry C Papersupporting

confidence: 80%

Section: Introductionmentioning

confidence: 98%

Ferrite-grafted polyaniline nanofibers as electromagnetic shielding materials

et al. 2013

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“…This frequency region was chosen due to the possibility of observing resonance reflection (NFMR) in the soft magnetic phase (spinel). It is noted that the presence of resonance (significant weakening of the reflected radiation) in this frequency range is typical of spinels [ 38 , 39 ]. Such behavior is due to a strong coupling between soft magnetic and hard magnetic phases that results in a weakening of the absorption for hard the magnetic phase and an increased reflection for soft magnetic phase as a function of the phase ratio concentration.…”

Section: Resultsmentioning

confidence: 99%

Correlation Between Composition and Electrodynamics Properties in Nanocomposites Based on Hard/Soft Ferrimagnetics with Strong Exchange Coupling

et al. 2019

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In this work, Sr0.3Ba0.4Pb0.3Fe12O19/(CuFe2O4)x (x = 2, 3, 4, and 5) as strongly exchange-coupled nanosized ferrites were fabricated using a one-pot sol–gel combustion method (citrate sol-gel method). The X-ray diffraction (XRD) powder patterns of the products confirmed the occurrence of pure, exchange-coupled ferrites. Frequency dependencies of the microwave characteristics (MW) were investigated using a co-axial method. The non-linear behavior of the MW with the composition transformation may be due to different degrees of Fe ion oxidation on the spinel/hexaferrite grain boundaries and strong exchange coupling during the hard and soft phases.

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“…2. An efficient microwave absorber should have larger values of imaginary part of both complex permeability and permittivity, where the real part denotes the energy storage and imaginary part represents the energy loss [12]. It can be observed in Fig.…”

Section: Experiments Al Techniquesmentioning

confidence: 99%

Microwave absorption properties of nanostructured nickel ferrite

Isha

Najim

Puthucheri

et al. 2014

2014 International Conference on Electronics and Communication Systems (ICECS)

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The present paper discusses the development, characterization and microwave absorption properties of nanostructured nickel ferrite and the influence of loading of the frequency selective surfaces (FSS) on microwave absorption. Synthesis of the material was done by a sol-gel mediated auto-combustion technique and phase purity was determined by X-ray diffraction studies. As prepared nickel ferrite of crystallite size of 12.0 nm and the calcined sample of 36.0 nm were used for further studies. The complex permittivity, permeability and the reflection loss of the materials were measured in X-band (8.2 GHz to 12.4 GHz) and the properties are compared with their crystallite size. Simulations have been carried out using Ansoft HFSS (High Frequency Structure Simulator) microwave software of single and double square geometry for nickel ferrite to obtain the maximum absorption with large band width. Single layer nickel ferrite absorber of thickness 3 mm, loaded with double-square FSS has given the reflection loss (RL) of -12.5 dB at 9.6 GHz and -10 dB with a bandwidth of 2.0 GHz. The loading of FSS increased the reflection loss of nickel ferrite with 12.0 nm crystallite size whereas a broadening in the bandwidth of absorption was observed for nickel ferrite of larger crystallite size.

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Study on the Absorption Properties of Spinel Type Ferrite Composite Coatings in the Low Frequency

Cited by 10 publications

References 9 publications

Ferrite-grafted polyaniline nanofibers as electromagnetic shielding materials

Ferrite-grafted polyaniline nanofibers as electromagnetic shielding materials

Correlation Between Composition and Electrodynamics Properties in Nanocomposites Based on Hard/Soft Ferrimagnetics with Strong Exchange Coupling

Microwave absorption properties of nanostructured nickel ferrite

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