Magnetorheological Hybrid Elastomers Based on Silicone Rubber and Magnetorheological Suspensions with Graphene Nanoparticles: Effects of the Magnetic Field on the Relative Dielectric Permittivity and Electric Conductivity.

Bica Bica,Bunoiu Bunoiu

doi:10.3390/ijms20174201

Abstract

Hybrid magnetorheological elastomers (hMREs) were manufactured based on silicone rubber, silicone oil, carbonyl iron microparticles, graphene nanoparticles and cotton fabric. Using the hMREs, flat capacitors (FCs) were made. Using the installation described in this paper, the electrical capacitance and the coefficient of dielectric losses of the hMREs were measured as a function of the intensity of the magnetic field superimposed over an alternating electric field. From the data obtained, the electrical conductivity, the relative dielectric permittivity and magnetodielectric effects are determined. It is observed that the obtained quantities are significantly influenced by the intensity of the magnetic field and the amount of graphene used.

Highlights

Magnetorheological materials consist of a silicone oil-based matrix, mineral oil, elastomer, etc., in which a magnetisable phase and additives are dispersed
The magnetisable phase is in the form of ferro-ferrimagnetic particles, and the additives are in the form of nano-microparticles
The distances between A and flat capacitors (FCs) are fixed in such a such a way the intensity of the magnetic is increased inof steps of 50 up kA/m up to values way that thethat intensity of the magnetic field isfield increased in steps

Summary

Introduction

Magnetorheological materials consist of a silicone oil-based matrix, mineral oil, elastomer, etc., in which a magnetisable phase and additives are dispersed. The magnetisable phase is in the form of ferro-ferrimagnetic particles, and the additives are in the form of nano-microparticles The latter can be either electroconductive or dielectric. These materials are known by the generic name “smart materials” [1,2,3,4,5,6,7,8] They have a certain peculiarity, which consists in the fact that their physical properties change significantly when applying external factors in the form of magnetic fields, electromagnetic fields, mechanical tensions, etc. This property of magnetorheological materials is used in technical applications [14,15]

Methods

Discussion

Conclusion