Electrical Properties of Magnetoactive Boron‐Organo‐Silicon Oxide Polymers

Abstract

The electrical properties of rheopectic magnetoactive composites comprising boron‐organo‐silicon oxide dielectric matrices containing carbonyl iron microparticles are presented for the first time. The increase in interfacial magnetocapacitance is seen to greatly exceed that experienced when using conventional elastomeric matrices such as polydimethylsiloxane. In addition to the increase in capacitance, a simultaneous and sharp decrease in the parallel electrical resistance over several orders of magnitude is also observed. The effects are time dependent but repeatable. Potential applications include magnetically controlled frequency dependent devices, magnetic sensor systems, weighting elements for neural networks, etc.

Electrical properties of magnetorheological fluids

“…possible. Due to their higher viscosity, electrical rise and decay times for MBP have been measured in seconds rather than milliseconds [Monkman et al, 2020]. Similarly, MRF absorbed by a mechanically stable solid medium such as textile fabric, reveal capacitance changes in excess of an order of magnitude [Gavrilovici et al, 2019], [Bica et al, 2020].…”

“…The design used, depicted in figure 1, has been described elsewhere [Monkman et al, 2020] and comprised two coils of inductance 150 mH (with core) and internal resistance 13 Ω respectively. This gives a time constant of 11.5 ms which is far beyond that of the MRF.…”

“…The flux density is then governed by the distance between the poles. This method produces temperature independent results but flux density measurements must be carried out following each adjustment [Monkman et al, 2020]. In both cases, the sample area was smaller than that of the yoke or the permanent magnet poles.…”