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Journal of Inorganic Materials

Journal of Inorganic Materials >

2006 , Vol. 21 >Issue 6: 1461 - 1466

DOI: https://doi.org/10.3724/SP.J.1077.2006.01461

Research Paper

Properties of Fe/SiO2 Core-shell Composite Particles with Different Nanoshell Thickness

  • TONG Guo-Xiu ,
  • WANG Wei ,
  • GUAN Jian-Guo ,
  • ZHANG Qing-Jie
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  • State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China

Received date: 2005-11-14

  Revised date: 2006-03-13

  Online published: 2006-11-20

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Abstract

Using a sol-gel route with polyvinyl pyrrolidone as the surfactant, the carbonyl iron microparticles were uniformly and fleetly coated by SiO2 nanoshell, whose thickness was conveniently different by changing reaction time. The influences of shell thickness on the properties of the Fe/SiO2 core-shell particles were studied. The results show that increasing the thickness of SiO2
nanoshell (Dshell), the anti-oxidation property of the Fe/SiO2 core-shell
composite particles is obviously improved while microwave permittivity decreased monotoneously. The saturation magnetization shows a maximum
value while both the coercivity and remnant magnetization show minimum
values at D shell=15nm. Meanwhile, the radar absorbing coating based on the
Fe/SiO2 core-shell composite particles with D shell=15nm shows a maximum
bandwidth of more than 10GHz, in which the reflective loss is less than --8dB.

Key words： core-shell particles; carbonyl iron; silica; microwave absorbing

Cite this article

TONG Guo-Xiu , WANG Wei , GUAN Jian-Guo , ZHANG Qing-Jie . Properties of Fe/SiO2 Core-shell Composite Particles with Different Nanoshell Thickness[J]. Journal of Inorganic Materials, 2006 , 21(6) : 1461 -1466 . DOI: 10.3724/SP.J.1077.2006.01461

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