Engineering Dielectric Loss of FeCo/Polyvinylpyrrolidone Core‐Shell Nanochains@Graphene Oxide Composites with Excellent Microwave Absorbing Properties

In this paper, we report on the microwave absorbing properties of the Ni/SiO2 core/shell soft magnetic material which was synthesized by the tetraethyl orthosilicate (TEOS) hydrolysis method. The SEM patterns were shown that the particles of Ni/SiO2 were more dispersed and homogeneous. Microwave absorbing properties were measured in the range of 0.1–18 GHz. A reflection loss (RL) exceeding −20 dB in the frequency range of 2.6–8.9 GHz was achieved for an absorber thickness of 2.0–5.6 mm, and an optimal RL of −49.5 dB was obtained at 4.4 GHz for the thickness of 3.5 mm. The good microwave absorption properties resulted from a proper impedance match as a consequence of the insulator SiO2 around Ni particles.

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Preparation of hollow core/shell Fe3O4@graphene oxide composites as magnetic targeting drug nanocarriers

Journal of Biomaterials Science Polymer Edition ◽

10.1080/09205063.2016.1268463 ◽

2016 ◽

Vol 28 (4) ◽

pp. 337-349 ◽

Cited By ~ 15

Author(s):

Junmei Wang ◽

Jianjun Fang ◽

Pan Fang ◽

Xian Li ◽

Shijie Wu ◽

...

Keyword(s):

Graphene Oxide ◽

Core Shell ◽

Magnetic Targeting ◽

Hollow Core ◽

Oxide Composites ◽

Drug Nanocarriers

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Facile fabrication of porous hexagonal ﬂaky Co@C core-shell composites with excellent microwave-absorbing properties

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2021.159815 ◽

2021 ◽

pp. 159815

Author(s):

Yanyan Liu ◽

Zhouyu Tong ◽

Kaiyuan Che ◽

Mingliang Ma ◽

Weibo Huang ◽

...

Keyword(s):

Core Shell ◽

Microwave Absorbing Properties ◽

Facile Fabrication ◽

Microwave Absorbing

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Engineering of dielectric composites on electromagnetic and microwave absorbing properties for operation in the X-band

Journal of Advanced Dielectrics ◽

10.1142/s2010135x21500016 ◽

2020 ◽

pp. 2150001

Author(s):

Bhoopendra Singh ◽

Vivek Pratap ◽

Mohit Katiyar ◽

S. M. Abbas ◽

Y. K. Sharma ◽

...

Keyword(s):

Dielectric Loss ◽

Network Analyzer ◽

Frequency Range ◽

Melt Mixing ◽

Band Frequency ◽

Microwave Absorbing Properties ◽

X Band ◽

Mixing Method ◽

Microwave Absorbing ◽

Potential Use

In this study, carbon black (CB) powder-loaded polyurethane (PU) composites (CB–PU composites) were prepared by melt mixing method with different volume percentages (45, 50, 55, 58 and 61 vol.%) of CB in the PU matrix. The prepared CB–PU composites had been further studied for surface morphology using the field-emission scanning electron microscopy (FESEM) technique. Dielectric properties in terms of real permittivity ([Formula: see text] and imaginary permittivity ([Formula: see text] of the fabricated composites were computed using an Agilent E8364B vector network analyzer in the frequency range of 8–12 GHz ([Formula: see text]-band). Dielectric loss factor of the prepared CB–PU composites was computed in terms of the dielectric loss tangent (tan [Formula: see text] = [Formula: see text]/[Formula: see text]. Microwave absorbing properties were appraised in terms of the reflection loss (RL) which in turn was calculated for varying thicknesses of the prepared composites from the measured real and imaginary permittivity data. The minimum RL was observed as −20.10 dB for the absorber with a thickness of 2.2 mm and the bandwidth achieved was 1.92 GHz for RL [Formula: see text]10 dB. Based on the above results these CB–PU composites have potential use as effective microwave absorbers in 8–12-GHz ([Formula: see text]-band) frequency range.

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