Magnetic Field Effects Induced in Electrical Devices Based on Cotton Fiber Composites, Carbonyl Iron Microparticles and Barium Titanate Nanoparticles

Gabriel Pascu,Octavian Madalin Bunoiu,Ioan Bica

doi:10.3390/nano12050888

Gabriel Pascu, Octavian Madalin Bunoiu + Show 1 more

Open Access

https://doi.org/10.3390/nano12050888

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Journal: Nanomaterials	Publication Date: Mar 7, 2022
Citations: 6	License type: CC BY 4.0

Affiliation: West University of Timişoara

Abstract

This work consists in the process of preparing magnetic active composite materials based on cotton fibers, iron carbonyl microparticles and barium titanate nanoparticles, and the electrical devices manufactured with them. For different compositions of the aforementioned ingredients, three such composites are manufactured and compacted at constant pressure between two electrodes. In the absence and in the presence of a magnetic field, using an RLC bridge, magnetocapacitive, magnetoresistive and magnetopiezoelectric effects are highlighted in the custom fabricated devices. It is shown that these effects are significantly influenced by the composition of the materials. Based on the model elaborated in this paper, the mechanisms that contribute to the observed effects are described and the theoretical predictions are shown to agree with the experimental data. The obtained results can be used in the assembly of hybrid magnetic active composites, which are low cost, ecological and have other useful physical characteristics for applications.

Highlights

IntroductionMagnetic liquids (MLs) [1–11], magnetorheological suspensions (MRSs) [12–28] and magnetorheological elastomers (MREs) [29–43] are characterized by the fact that they possess a magnetizable phase (ferri-ferromagnetic particles) and additives (fibers of natural and/or artificial polymers, nanotubes, graphene nanopallets, etc.) undissolved in the base matrix, which can be either liquid in the case of MLs and MRSs or typically a silicone rubber in the case of MREs. Each component of the MLs, MRSs and MREs has different physical characteristics, but together, as a whole, they form magnetically active composite materials (MACs), with different physical characteristics compared to those of the constituent components
Magnetic liquids (MLs) [1–11], magnetorheological suspensions (MRSs) [12–28] and magnetorheological elastomers (MREs) [29–43] are characterized by the fact that they possess a magnetizable phase and additives undissolved in the base matrix, which can be either liquid in the case of MLs and MRSs or typically a silicone rubber in the case of MREs
Active composite membranes are fabricated by doping cotton fabrics with carbonyl iron microparticles and barium titanate nanoparticles

Summary

Introduction

Magnetic liquids (MLs) [1–11], magnetorheological suspensions (MRSs) [12–28] and magnetorheological elastomers (MREs) [29–43] are characterized by the fact that they possess a magnetizable phase (ferri-ferromagnetic particles) and additives (fibers of natural and/or artificial polymers, nanotubes, graphene nanopallets, etc.) undissolved in the base matrix, which can be either liquid in the case of MLs and MRSs or typically a silicone rubber in the case of MREs. Each component of the MLs, MRSs and MREs has different physical characteristics, but together, as a whole, they form magnetically active composite materials (MACs), with different physical characteristics compared to those of the constituent components. MACs, the scientific community is preoccupied with improving their physical characteristics by finding new ways of preparation and characterization [1–3,6,7,12–19,23,25,27–35,39–42]. In these circumstances, we consider that research towards the assembly of MACs, using a magnetizable phase and additives in the form of nano/microparticles, would generate composite materials with physical characteristics suitable for various applications.

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