Cooperativity of nanoscale magnetic zeolitic imidazolate framework in magnetorheological fluid

Abstract

Particle sedimentation and magnetorheological (MR) effect are crucial to the stability and performance of magnetorheological fluid (MRF) and are bottlenecks that hinder their broad application in devices such as dampers, clutches, adaptive shock absorbers, etc. In this study, a magnetic zeolitic imidazolate framework (Fe3O4/ZIF-8) nanomaterial is synthesized, which exhibits exceptional potential as a superior reinforcing agent, effectively mitigating sedimentation issues and enhancing the MR effect of MRF. Introducing a steric effect yields improved particle suspension stability, contributing to the long-term stability and resistance to settling in MRF. Furthermore, a bidispersion coupling system between the nanocomposite particle and carbonyl iron powder in MRF demonstrates remarkable magnetism characteristics, particularly in densely packed two-phase flow conditions. In comparison to an MRF lacking Fe3O4/ZIF-8, the suspension stability and magneto-induced dynamic yield stress of an MRF with a 3 wt% nanocomposite particle are enhanced by 24.8% and 21.12%, respectively. Additionally, the suspension with nanocomposite particles demonstrates exceptional performance in terms of magnetic field responsiveness and aggregation resistance. The comprehensive analysis presented in this paper underscores the efficacy of this solution in maintaining the suspension stability of MRF, a breakthrough with the potential to advance the capabilities of MRF devices and extend their operational lifespans.