Magnetorheological materials (MR) are smart composite materials that generally consist of highly magnetizable micrometer-sized particles (up to 50% volume) dispersed in a non-magnetizable fluid medium . This arrangement means that the fluid exhibits a reversible and virtually instantaneous transition from a low viscosity liquid to a virtually solid state with exact controllability when placed under an external magnetic field. Generally speaking, particles of MR fluids should have large saturation magnetization and small residual magnetization, be active over a wide temperature range, and be stable against settling, irreversible flocculation, and chemical degradation. Based on these criteria for the magnetic constituent of an MR fluid, carbonyl iron particles are commonly used for MR fluids due to their large saturation magnetization (M = 2.216 [4]) (cobalt and nickel are also commonly used). In conjunction with magnetizable particles, the 3 other main constituents of MR fluids are: the carrier fluid (mineral oil or silicone), dispersants (to minimize particle coagulation) and gelling additives. Say no to plagiarism. Get a tailor-made essay on “Why violent video games should not be banned”?Get an original essayDue to the nature of the magnetorheological effect, incredible precision in controlling their viscosity, as the strength of the magnetic field can be manipulated downward. at the tiniest level. This controllability, coupled with their low power demand and wide temperature range, makes them incredibly desirable for many engineering applications, particularly those requiring active vibration control and torque transfer. Typical examples: shock absorbers, brakes, clutches and control valves; Despite their appeal in many applications, their commercialization remains a challenge, namely obtaining the highest possible yield strength for minimum input energy. Due to current MR fluids, suboptimal yield strength and the value of stronger MR fluids, any improvement is greatly sought after. A well-documented attribute of MR fluids is that as the spherical particles grow larger, the yield strength of the MR fluid also increases. ; However, the huge disadvantage of increasing dispersant size is increased fluid instability, as the density differential between the dispersant and its suspension causes an exponential increase in sedimentation rates, thus making the use of particles larger ones are impractical. A potential solution to this problem is the use of microwire structures. Usually around 200 to 300 nm in diameter and ranging from 3 to 13 micrometers in length, they exhibit the same increase in yield strength but significantly reduced sedimentation rates compared to their spherical analogue or potentially in use of a mixture of sizes in a bidisperse or polydispersant MR. fluid.Microwire structureBell et al 2008 conducted research on this topic. Their method involved using two distinct length distributions of pure iron microwires, 5.4 ± 5.2 μm and 7.6 ± 5.1 μm, each with a diameter of 260 ± 30 nm. Spherical iron particles with a diameter of 1–3 μm in a silicone oil suspension were used to replicate conventional MR fluids as a control. Their method of experimentation was to use an Anton-Paar Physica MCR300 parallel plate rheometer equipped with an MRD180 for rheological measurements with a 1 mm gap maintained 4.