Publication Date:
2017-08-11
Description:
Citric acid-based sol-gel method has been used to synthesize metal oxides widely. Iron-based one-dimensional nanostructured materials, including Fe 2 O 3 nanotubes and Fe 3 O 4 nanofibers, have been successfully prepared by directly annealing electrospun citric acid-based precursor fibers under different atmospheres in this study. Thermo-gravimetric and differential thermal analyses were carried out from room temperature to 800 °C under air and argon atmospheres, respectively. The results reveal the formation mechanisms for Fe 2 O 3 nanotube and Fe 3 O 4 nanofiber. Fe 2 O 3 tubular structures with average inner diameter about 500 nm and wall thickness about 20 nm were obtained. Fe 3 O 4 nanoparticles were self-assembled along the one dimensional orientation to form Fe 3 O 4 nanofibers with average diameter around 500 nm. The reflection losses as a function of frequency for the samples with 23 and 33 wt% Fe 3 O 4 nanofibers in paraffin were examined. The frequency dependence of reflection losses under various matching thicknesses (2, 3, 4, 6 and 8mm) was simulated. The as-fabricated Fe 3 O 4 nanofibers can be believed to be promising candidates as highly effective microwave absorbers. This article is protected by copyright. All rights reserved.
Print ISSN:
0002-7820
Electronic ISSN:
1551-2916
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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