Journal ArticleDOI
Enhancement of magnetic losses in hybrid polymer composites with MnZn-ferrite and conductive fillers
Robert Moučka,A.V. Lopatin,A.V. Lopatin,Natalia E. Kazantseva,Natalia E. Kazantseva,Jarmila Vilčáková,Petr Saha +6 more
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TLDR
In this paper, the magnetic and dielectric spectra of hybrid polymer composites are studied in the frequency range from 1MHz to 10GHz, and the development of a core-shell structure is evidenced by the lower electric percolation threshold in an HPC compared with that in PU filled with conductive filler.Abstract:
Polymer composites (PCs) with a polyurethane (PU) matrix filled with magnetic filler (MnZn ferrite) and hybrid polymer composites (HPCs) consisting of this magnetic filler and various types of conductive fillers (carbon black, carbon fibers, aluminum powder, polypyrrole) are prepared. The matrix structure of a HPC is formed (i) by a polymer filled with conductive filler, which forms the skeleton of an infinite cluster, and (ii) by ferrite particles that are larger than conductive particles. Thus, an HPC represents an ensemble of ferrite particles each of which is surrounded by a conductive medium and can be considered as a “core–shell” structure. The development of a core–shell structure is evidenced by the lower electric percolation threshold in an HPC compared with that in PU filled with conductive filler. Magnetic and dielectric spectra of PCs and HPCs are studied in the frequency range from 1 MHz to 10 GHz. Hybrid systems exhibit a considerable enhancement of magnetic losses compared with PCs. The enhancement of magnetic losses in HPCs is due to the conduction currents that are induced in the conductive shell by a microwave magnetic field.read more
Citations
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Journal ArticleDOI
Polymeric nanocomposites for electromagnetic wave absorption
TL;DR: The need for protecting human or devices from harm and for keeping something from being detected by other instruments is spawning a world of attention in the development of novel electromagnetic (EM) wave absorption materials as discussed by the authors.
Journal ArticleDOI
Magnetic anisotropy of the graphite nanoplatelet–epoxy and MWCNT–epoxy composites with aligned barium ferrite filler
O. S. Yakovenko,Ludmila Matzui,Ludmila Vovchenko,A.V. Trukhanov,A.V. Trukhanov,Illya S. Kazakevich,S. V. Trukhanov,Yuriy Prylutskyy,Uwe Ritter +8 more
TL;DR: In this article, the magnetic properties of hybrid epoxy-based composite materials with magnetic barium ferrite (BaM) and conductive carbon (multi-walled carbon nanotubes and graphite nanoplatelets) fillers were evaluated.
Book ChapterDOI
Ferrite Materials: Nano to Spintronics Regime
R.K. Kotnala,Jyoti Shah +1 more
TL;DR: A brief introduction about the importance and need of bulk and nanoferrite, their applications in various fields like in communication, microwave, electromagnetic shielding, memory devices, multiferroics, spintronics devices, humidity/gas sensing, drug delivery, hyperthermia, biosensors, and so on, have been elaborated as mentioned in this paper.
Journal ArticleDOI
Microwave absorption properties of reduced graphene oxide strontium hexaferrite/poly(methyl methacrylate) composites.
TL;DR: Flexible microwave absorber composite films can be fabricated by simple gel casting techniques using reduced graphene oxide (RGO) and strontium ferrite (SF) in a poly(methyl methacrylate) (PMMA) matrix using a chemical reduction method using hydrazine.
Journal ArticleDOI
High Magneto-Crystalline Anisotropic Core–Shell Structured Mn0.5Zn0.5Fe2O4/Polyaniline Nanocomposites Prepared by in Situ Emulsion Polymerization
M. Abdullah Dar,M. Abdullah Dar,R.K. Kotnala,Vivek Verma,Jyoti Shah,Weqar Ahmad Siddiqui,Masood Alam +6 more
TL;DR: In this article, core-shell nanocomposites composed of Mn0.5Zn0.4 nanocrystals and conjugated polymer polyaniline were successfully synthesized from a simple and inexpensive process, and in situ chemical oxidative polymerization of aniline occurs.
References
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Journal ArticleDOI
Microwave applications of soft ferrites
TL;DR: In this paper, the authors present a review of the development of thin film ferrite technology and device design in planar microwave devices and their magnetic losses related to planar shape and inhomogeneous internal fields.
Journal ArticleDOI
FEATURE ARTICLE Conducting Polymer Composites
TL;DR: In this article, it is shown that the combined mechanical, thermal and electrical interaction between the filler particles via their electrical contacts and the surrounding polymer host matrix are responsible for the properties of the composite material.
Journal ArticleDOI
A comprehensive picture of the electrical phenomena in carbon black–polymer composites
TL;DR: In this paper, the electrical conductivity of carbon black polymer composites was found to depend on the structure of the carbon black particles and to deviate from the expectations of classical percolation theory.
Journal ArticleDOI
Frequency dispersion of complex permeability in Mn–Zn and Ni–Zn spinel ferrites and their composite materials
TL;DR: In this paper, the contribution of domain-wall and natural resonance to the permeability spectra was estimated by the numerical fitting of actual measurement data to a simple formula, where the frequency dispersion type of each component, relaxation or resonance, was estimated from one of the fitting parameters, damping factor.
Journal ArticleDOI
Frequency dispersion of permeability in ferrite composite materials
TL;DR: In this article, Ni-Zn ferrite composite materials, prepared by mixing the ferrite particles with EVA resin, have been studied and analyzed using the magnetic circuit model.