Electrical and Magnetodielectric Properties of Magneto-Active Fabrics for Electromagnetic Shielding and Health Monitoring.

Madalin Bunoiu,Gabriel Pascu,Larisa Marina Elisabeth Chirigiu,Ioan Bica,Eugen Mircea Anitas

doi:10.3390/ijms21134785

Abstract

An efficient, low-cost and environmental-friendly method to fabricate magneto-active fabrics (MAFs) based on cotton fibers soaked with silicone oil and iron oxide microfibers (mFe) at mass fractions 2 wt.%, 4 wt.% and 8 wt.% is presented. It is shown that mFe induce good magnetic properties in MAFs, which are subsequently used as dielectric materials for capacitor fabrication. The electrical properties of MAFs are investigated in a static magnetic field with intensities of 0 kA/m, 160 kA/m and 320 kA/m, superimposed on a medium-frequency electric field. The influence of mFe on the electrical capacitance and dielectric loss tangent is determined, and it can be observed that the electrical conductivity, dielectric relaxation times and magnetodielectric effects are sensibly influenced by the applied magnetic and electric fields. The results indicate that the MAFs have electrical properties which could be useful for protection against electromagnetic pollution or for health monitoring.

Highlights

Recent technological advancements in various fields such as telecommunications, computer science or satellite broadcasts expose human beings to significant increases of the radiation levels of electromagnetic radiations (EMR), especially those arising from the fast-developing 5G technology [1]
The saturation specific magnetization occurs at about 477 kA/m, and together with the remanent specific magnetization, they generally increase with the volume fraction of mFe
Note that the obtained magneto-active fabrics (MAFs) consist from a mixture of different components, i.e., cotton fibers and silicone oil, in addition to the microfibers, and this gives rise to an apparent specific magnetization in Figure 1 and Table 1

Summary

Introduction

Recent technological advancements in various fields such as telecommunications, computer science or satellite broadcasts expose human beings to significant increases of the radiation levels of electromagnetic radiations (EMR), especially those arising from the fast-developing 5G technology [1]. Many recent studies have shown that exposure to EMR is causing health hazards for human beings, plants and animals [2,3,4,5] at levels well below most of the accepted international guidelines [6]. Fabrication of environmental-friendly materials functioning as health monitoring systems and EMR absorbers in a wide bandwidth, produced at low-costs and exhibiting design flexibility, became a stringent necessity nowadays. An important class of smart materials is represented by magneto-active fabrics (MAFs), since they can be designed to include crucial features that enable fabrication of high-performance health monitoring systems and EMR absorbers [20]

Methods

Results

Discussion

Conclusion