TY - JOUR
T1 - Magnetite hollow microspheres with a broad absorption bandwidth of 11.9 GHz
T2 - Toward promising lightweight electromagnetic microwave absorption
AU - Shanenkov, Ivan
AU - Sivkov, Alexander
AU - Ivashutenko, Alexander
AU - Zhuravlev, Viktor
AU - Guo, Qing
AU - Li, Liping
AU - Li, Guangshe
AU - Wei, Guodong
AU - Han, Wei
N1 - Funding Information:
The experimental part of this work was supported by the Russian Scientific Foundation (grant no. 15-19-00049). Analytical studies and electromagnetic tests were funded from the Russian Foundation for Basic Research (RFBR, grant no. 17-53-53038) and from the Tomsk Polytechnic University Competitiveness Enhancement Program grant. The authors sincerely acknowledge financial support from the National Natural Science Foundation of China (NSFC Grant No. 21571080 and 11274138), the NSFC-RFBR Joint Project (Grant No. 21611530688), and the Natural Science Foundation of Jilin province (No. 20170101193JC).
Publisher Copyright:
© the Owner Societies 2017.
Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2017
Y1 - 2017
N2 - High-performance magnetite-based hollow spheres with the advantages of low density and low loading content are promising as an ideal lightweight electromagnetic (EM) wave absorption candidate. However, the effective preparation methods for these hollow spheres are still limited, and as a result, materials design and practical applications based on their size-dependent EM microwave attenuation properties are poorly accessible. In this study, high quality magnetite hollow spheres were successfully prepared by a simple, fast, one-step, and scalable plasma dynamic method with sole use of inexpensive precursors (oxygen and mild steel). The experimental results reveal that the as-prepared products are hollowed multiple-component magnetite spheres and have a very wide size distribution with a diameter of several tens of nanometers to hundreds of micrometers, which can be further separated into three fractions with different particle size distributions (0-30 μm, 30-100 μm, and >100 μm) by a simple magnetic separation method. The EM wave absorption results demonstrate that the hollow microspheres can exhibit excellent absorption ability with an effective absorption bandwidth (reflection loss ≤-10 dB) of 11.9 GHz from 3.7 to 15.6 GHz for an only 2 mm thick test absorber (50 wt% filler) and a maximum RL value of -36 dB at ∼8.2 GHz. Moreover, the positions of these resonant absorption peaks strongly depend on the sphere sizes and can be regulated at the L + C band, X band, and Ku band. Strikingly, differing from the nearly negligible microwave absorption for the ground powders, the dominating absorption mechanism for the hollow microspheres could be ascribed to the enhanced magnetic loss and multiple scattering due to the novel hollow magnetic structures, which are beneficial for the attenuation ability and improvements to their permeability and impedance matching.
AB - High-performance magnetite-based hollow spheres with the advantages of low density and low loading content are promising as an ideal lightweight electromagnetic (EM) wave absorption candidate. However, the effective preparation methods for these hollow spheres are still limited, and as a result, materials design and practical applications based on their size-dependent EM microwave attenuation properties are poorly accessible. In this study, high quality magnetite hollow spheres were successfully prepared by a simple, fast, one-step, and scalable plasma dynamic method with sole use of inexpensive precursors (oxygen and mild steel). The experimental results reveal that the as-prepared products are hollowed multiple-component magnetite spheres and have a very wide size distribution with a diameter of several tens of nanometers to hundreds of micrometers, which can be further separated into three fractions with different particle size distributions (0-30 μm, 30-100 μm, and >100 μm) by a simple magnetic separation method. The EM wave absorption results demonstrate that the hollow microspheres can exhibit excellent absorption ability with an effective absorption bandwidth (reflection loss ≤-10 dB) of 11.9 GHz from 3.7 to 15.6 GHz for an only 2 mm thick test absorber (50 wt% filler) and a maximum RL value of -36 dB at ∼8.2 GHz. Moreover, the positions of these resonant absorption peaks strongly depend on the sphere sizes and can be regulated at the L + C band, X band, and Ku band. Strikingly, differing from the nearly negligible microwave absorption for the ground powders, the dominating absorption mechanism for the hollow microspheres could be ascribed to the enhanced magnetic loss and multiple scattering due to the novel hollow magnetic structures, which are beneficial for the attenuation ability and improvements to their permeability and impedance matching.
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U2 - 10.1039/c7cp03292g
DO - 10.1039/c7cp03292g
M3 - Article
C2 - 28722037
AN - SCOPUS:85027331958
VL - 19
SP - 19975
EP - 19983
JO - Physical Chemistry Chemical Physics
JF - Physical Chemistry Chemical Physics
SN - 1463-9076
IS - 30
ER -