Structure, Morphology and Electrical/Magnetic Properties of Ferrite/Polymer Composites

Dear Colleagues,

Ferrites are suitable magnetic materials that have a high degree of structural stability. Ferrite materials have found wide application in various fields of science and technology, such as in the cores of generators, electric motors, transformers and switches, magneto-optical recording media and waveguides, etc. Currently, ferrites are often used in biomedical applications such as magnetic drug delivery systems, contrast agents in MRI (magnetic resonance imaging), and magnetic particle imaging. One of the most important tasks in the creation of modern mobile communication devices is the development of new materials that are capable of operating in a wide (up to 100 GHz) frequency range. Ferrites are one of the most promising electromagnetic materials for use in the centimeter and millimeter wave ranges due to their high magnetic permeability and magnetization and good dielectric properties in the microwave range. These compounds are strong magnets with high coercive properties and magnetic permeability and are also characterized by high magnetocrystalline anisotropy values. The surface and quantum confinement phenomena associated with the huge surface-to-volume ratio and scale-dependent characteristics of nanostructured ferrites have recently attracted close attention. By changing these values, it is possible to obtain the desired changes in the physicochemical properties of ferrites and the parameters of finished products from them. Nanoscale ferrite samples can be obtained by spray pyrolysis, citrate gel, hydrothermal, sol-gel, microwave boiling, coprecipitation, and flash combustion. Ferrite nanoparticles have a high electrical resistivity. Their anomalous magnetic properties are due to the interconnected distribution of the initial cations at the sites of the crystal lattice. A nanocomposite is defined as a material with more than one solid phase, that is either a cermet or polymer, and compositionally or structurally bonded, with at least one dimension is in the nanometer range. The combination of a nanomaterial with a polymer is very attractive not only for enhancing the dielectric properties of the polymer, but also for imparting new electronic properties to the resulting material based on morphological modifications or electronic interactions between the two components. The properties of a nanocomposite are greatly affected by the scale of its constituent phases and the degree of mixing of these phases. Depending on the nature of the components used and the method of preparation, significant differences in the properties of the nanocomposite can be obtained. Nanocomposites based on polymers with the addition of ferrites represent a new concept for creating functional systems with desired properties resulting from the synergistic interaction of the filler and matrix. Polymer-ceramic nanocomposites are promising materials. They can combine the high magnetic and dielectric constants of ferrites with the mechanical processability and flexibility of polymers.

We look forward to receiving your contributions.

Dr. Ekaterina L. Trukhanova
Dr. Tatiana Zubar
Dr. Daria Tishkevich
Guest Editors

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• nanostructured ferrites
• flash auto combustion method
• magnetodielectric properties
• permittivity
• permeability
• polymer based nanocomposites