Magnetic field intensity and graphene concentration effects on electrical and rheological properties of MREs-based membranes

Abstract Electric capacitors are manufactured having as dielectric materials cotton fabric-based membranes reinforced with silicone oil ( 20% vol ), carbonyl iron ( 20% vol ), graphene nanoparticles (nGr; Φ=0%,4%,8%,12%,16% and respectively 20% vol ) and silicone rubber ( 60%,56%,52%,48%,44% and respectively 40% vol ). The equivalent capacitance ( C _p ) and resistance ( R _p ) of the capacitors are measured using an RLC bridge at a frequency of 10 kHz and for magnetic field intensities 0≤H(kA {m}⁻¹)≤200 . From the functions {C}_p={C}_p{(H)}_Φ and {R}_p={R}_p{(H)}_Φ we obtain the real ( {ϵ}_r^′ ) and imaginary ( {ϵ}_r^″ ) components of the complex relative dielectric permittivity {ϵ}_r^* , the electrical conductivity σ , and viscosity η of the membranes. We show that {ϵ}_r^′ , {ϵ}_r^″ , σ and η increase with H and they are sensibly influenced by Φ. We present and discuss the obtained results.