Microwave absorption properties of hollow microsphere/titania/M-type Ba ferrite nanocomposites

Mu, Guohong; Chen, Na; Pan, Xifeng; Yang, Kai; Gu, Mingyuan

doi:10.1063/1.2764440

Cited by 73 publications

(37 citation statements)

References 15 publications

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“…Obviously, the composites containing the anisotropic dendritic iron show an obvious absorption in 2-18 GHz. The RL value of -20 dB is comparable to 99 % of incident microwave absorption; thus, ''RL \ -20 dB'' is considered as a target value for the microwave absorption application [2]. It can be seen that the composites show a minimal RL of -24.3 dB at 11.5 GHz when d is 1.0 mm.…”

Section: Microwave Electromagnetic Properties Of the Dendritic Ironmentioning

confidence: 98%

“…The last terms in Eqs. (2) and (3) the dendritic iron particles, which can be regarded as crosslinked nanorods with good conductivity, are easy to touch with each other and form a conduction pathway in the composite. Thus, the composite containing the dendritic irons has large complex conductivity and the distinctly enhanced permittivity.…”

Section: Microwave Electromagnetic Properties Of the Dendritic Ironmentioning

confidence: 99%

“…Therefore, EM wave absorption materials have attracted much attention to resolve the above problems. The conventional thin-thickness EM wave absorption materials are generally based on absorbers including ferrites and metal iron particles, which usually have excellent microwave adsorption properties in the megahertz to gigahertz ranges due to their strong magnetism and high electrical resistivity [2,3]. However, these kinds of composites usually demand high concentration of the absorbers, resulting in large density.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis, magnetic and microwave electromagnetic properties of dendritic iron

Yan

Zhao

et al. 2015

Appl. Phys. A

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Iron dendritic micropines are synthesized by a hydrogen reduction, where the hematite dendritic micropines prepared by a hydrothermal method are used as starting materials. The as-obtained dendritic iron exhibits enhanced coercivity and remanent magnetization at room temperature and high complex permittivity at 2-18 GHz due to the peculiar shape anisotropy and good crystallinity. The negative imaginary permeability is observed at 14.5-18.0 GHz, suggesting it has a potential as a lefthanded material. The paraffin-based composites containing 30 wt% dendritic irons show large permittivity resulting from the charge polarization and the conductivity and have a minimal reflection loss (RL) of -37.4 dB at 7.4 GHz when the thickness (d) is 2.0 mm. The RL values less than -20 dB are obtained in the frequency range of 5.5-12.9 GHz when d increases from 0.9 to 3.0 mm.

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Section: Microwave Electromagnetic Properties Of the Dendritic Ironmentioning

confidence: 98%

Section: Microwave Electromagnetic Properties Of the Dendritic Ironmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synthesis, magnetic and microwave electromagnetic properties of dendritic iron

Yan

Zhao

et al. 2015

Appl. Phys. A

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“…18 In this study, we measured the permittivity and permeability of the SWNTs-b-CD-PEI-Ad sample and calculated the reflection loss of samples (the thickness of the sample was 3 mm). 19 As shown in Fig. 2B, SWNTs-b-CD-PEI-Ad samples showed two It should be noted that the SWNTs-b-CD-PEI-Ad composite showed moisture absorption capacity under ambient conditions due to the hydrophilicity of the amino groups.…”

mentioning

confidence: 90%

An efficient multiple healing conductive composite via host–guest inclusion

Zhang

Jü

et al. 2015

Chem. Commun.

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A self-healable conductive composite is developed by combining the small molecules and nanotubes through host-guest interactions. This material shows uniform conductivity, microwave absorption and humidity sensing properties, and can be rapidly healed to over 90% electrical and mechanical properties with the aid of water multiple times. In addition, the produced material is also remouldable and recyclable.Driven by the motivation of developing advanced reliable and durable materials, there has been intense research into selfhealing materials. 1 But up to now, most self-healing materials are structural materials. 2 The research on functional materials with self-healing properties is relatively rare. 3 Electrically conductive materials are a class of functional materials and are indispensable for the development of various modern electronics. 4 Restoration of the conductivity of an electronic component could be of great significance for building advanced electronics. 5 A few healable conductive materials have been developed. 6 For example, Bielawski etc. firstly fabricated a self-healing conductor by introducing reversible bonds into conductive polymers which consist of N-heterocyclic carbenes and transition metals, 7 but the healing process requires high temperatures and solvent vapor. Polymeric microcapsules incorporated with conductive species as the healing agent were also explored to create self-healing conductive materials. 8 When mechanical damage was exerted to the capsules, these capsules were ruptured and the conductive species were released to the damaged region. Hence, the conductivity was restored. This capsule-based method is fast, efficient, and the healing process is autonomous. 9 But healing is not repeatable at a given place and does not allow simultaneous structural healing. Another alternative method is to impart the selfhealing ability of polymers to inorganic conductive materials (such as Ag, mNi, and nanotubes). 10 These materials heal themselves either by manually bring the broken conductors into contact or with the aid of stimuli. 11 However, among these materials, hydrogenbonded materials suffer from the slow healing speed and poor tolerance to moisture, and multilayer films deposited silver nanowires show nonuniform electrical properties from the interior to the surface. Developing conductive materials that possess parameters including uniform conductivity, fast self-healing speed, both electrical and mechanical healing capability, and repeatable healing capability is still a challenge.In this communication, we design a composite material by combining the small molecules and nanotubes through hostguest interactions. The resultant composite shows uniform conductivity, and can be rapidly healed to over 90% electrical and mechanical properties with the aid of water multiple times. In addition, the produced material is also remouldable and recyclable. b-Cyclodextrin-decorated single-walled carbon nanotubes (b-CD-SWNT) acted as macro-crosslinkers, and endowed the composite with mechanical s...

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“…As referred in literature, porous structure may exhibit good microwave absorbing properties. 5,6,[16][17][18] When microwave transmits into the porous spheres, multiple reflections and scattering will occur, leading to gradual dissipation of EM energy. The bulk quantities of defects, such as stacking faults, grain boundaries and interfaces, which can give rise to space charge polarization and relaxation, are also favorable to improving microwave absorption.…”

Section: E Microwave Absorbing Mechanism Of the Mwcnt-sic Compositesmentioning

confidence: 99%

Microwave absorption properties of MWCNT-SiC composites synthesized via a low temperature induced reaction

Zhu¹,

Bai²,

Li³

et al. 2011

AIP Advances

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The composites containing SiC and multiwalled carbon nanotubes (MWCNTs) were synthesized via the reaction of Si powders and MWCNTs induced by that of Na and sulfur. The MWCNT-SiC composites prepared at 600 °C exhibit excellent microwave absorbing properties, which reach a minimum reflection loss of -38.7 dB at a frequency around 12.9 GHz. The absorbing properties are bound up with the high yield of porous SiC spheres comprised of nanocrystals. The porous structure, high density of stacking faults in SiC crystallites, interfaces between MWCNTs and SiC spheres, grain boundaries between SiC nanocrystals, as well as the interfacial polarizations aroused therefrom, are responsible for the excellent microwave absorbing properties

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Microwave absorption properties of hollow microsphere/titania/M-type Ba ferrite nanocomposites

Cited by 73 publications

References 15 publications

Synthesis, magnetic and microwave electromagnetic properties of dendritic iron

Synthesis, magnetic and microwave electromagnetic properties of dendritic iron

An efficient multiple healing conductive composite via host–guest inclusion

Microwave absorption properties of MWCNT-SiC composites synthesized via a low temperature induced reaction

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