Abstract
Growth mechanisms of dynamic granular arrays based on magnetically controlled particles are presented. Method of the external rotating magnetic field (ERMF), based on a dipole interaction of magnetic spherical Fe3O4 particles in highly ordered volume arrays is proposed and a design for its practical implementation is developed. The magnetic assembly can result in permanent structures, which could be disassembled on demand by remote demagnetization. To study the interaction field of particles in the arrays, a mean field theory was used and the data were compared with experiment. Reflection spectra of electromagnetic radiation from a volume dense packed array of Fe3O4 particles with thicknesses of 3 and 6 mm, and a flat particles array with a set of 15 and 30 layers, as well as frequency characteristics of attenuation of electromagnetic radiation of the claimed materials in the frequency range from 8.0 GHz to 12.5 GHz obtained. Presented method and the installation have the prospect of being used in the processes of making composite materials for electromagnetic radiation protection using a wide range of materials of micro and nanoparticles.
Highlights
Arising from the rapid development of electronic devices, wireless communication tools, and local area networks, electromagnetic interference (EMI) has greatly threatened human health and disturbed various commercial or industrial equipment[1,2]
To obtain a composite material and study reflection spectrum and the frequency characteristics of attenuation of electromagnetic radiation, paraffin was added to the medium of the particle array in a volume ratio of 1:1
Analysing the X-ray diffraction pattern of the investigated particle samples, it was found that a significant part of the substance is in the x-ray morphological state
Summary
Arising from the rapid development of electronic devices, wireless communication tools, and local area networks, electromagnetic interference (EMI) has greatly threatened human health and disturbed various commercial or industrial equipment[1,2]. The demand for electromagnetic absorbents has become urgent over the past years. The ideal absorbing materials must have light weight, strong absorption, thin thickness, and broad frequency. Several factors, such as morphology, geometry and microstructure, are crucial in determining the electromagnetic absorption properties. A novel method was designed for porous 3-D granular arrays fabrication based on magnetically controlled particles as a new type of microwave absorption materials. These well-defined structures consist of numerous air pores. On the basis of this principle, a technique is developed for the formation of dynamic flat and 3-D particles arrays with a given packing structure
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