Obtaining a composite material based on Fe3O4 particles coated with Al nanoparticles using a rotating magnetic field
https://doi.org/10.17073/1997-308X-2021-1-71-82
Abstract
The paper focuses on the process of microspherical Fe3O4 particle cladding into a dense shell of Al nanoparticles using a rotating magnetic field (RMF) of uniformly oriented permanent magnets (NN, SS). The author’s unit for generating a rotating magnetic field is presented. Coated magnetite particles were used to form a composite material with a close-packed structure. The transition of an array of Fe3O4 particles from a fibrous dispersed structure to a dense packing upon applying a rotating magnetic field is described according to obtained photo materials. The spectra of reflection, absorption and attenuation of electromagnetic radiation of composite materials with «core–shell» particles are obtained for various material thicknesses. The minimum reflection coefficient is set at –4.5 dB. According to the comparative analysis of attenuation spectra, this indicator decreases in the presence of an Al nanoparticle shell on microspherical Fe3O4 particles in the composite material in contrast to particles without a shell. To explain the reflection and absorption spectra, we develop a hypothesis about the effect of the surface charge density in the layered shell on the change in the of Fe3O4 particle magnetization. The presented method of cladding Fe3O4 microparticles with Al nanoparticles using a rotating magnetic field makes it possible to create composite materials of a large size range for a wide range of applications. The possibility of forming a structure of magnetically controlled particle arrangement based on the developed unit opens up new prospects in various fields of science – from microelectronic technology to the creation of controlled filtration using a rotating magnetic field.
About the Authors
I. A. Shorstkii
Kuban State Technological University
Russian Federation
Russian Federation
Cand. Sci. (Eng.), associate prof. of the Department of technological equipment and life-support systems
350072, Krasnodar, Moskovskaya str., 2
N. Yakovlev
Institute of Materials Research and Engineering (IMRE)
Singapore
Singapore
Dr. Sci. (Eng.), research scientist of Advanced Characterisation and Instrumentation Department
138634, # 08-03, Innovis, Fusionopolis Way, 2
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Review
For citations:
Shorstkii I.A., Yakovlev N. Obtaining a composite material based on Fe3O4 particles coated with Al nanoparticles using a rotating magnetic field. Powder Metallurgy аnd Functional Coatings (Izvestiya Vuzov. Poroshkovaya Metallurgiya i Funktsional'nye Pokrytiya). 2021;(1):71-82. (In Russ.) https://doi.org/10.17073/1997-308X-2021-1-71-82
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