MnFe2O4 nanoparticles anchored on the surface of MgAl-layered double hydroxide nanoplates for stable magnetorheological fluids

Strong and Stable Magnetorheological Fluids Based on Flaky Sendust-Co0.4Fe0.4Ni0.2 Nanocomposite Particles

“…Despite the feasibility of MR fluid application in various fields, its merits are dwindled by poor long-term stability. This problem is mostly caused by a large density mismatch between the heavy magnetic particles and the light carrier medium, which results in rapid sedimentation of magnetic particles and makes the reuse of MR fluids difficult. , To solve this problem, many research studies have focused on fabricating magnetic composite materials by combining magnetic materials with low-density materials such as polymers, silica, or carbon materials. − However, low-density materials usually adversely affect the magnetic properties of the composite particles, leading to inferior MR performance compared with that of MR fluids containing bare magnetic materials. As a result, the use of composite-based MR fluids is severely limited despite improved long-term stability these days.…”

Synergistic Effects of Nonmagnetic Carbon Nanotubes on the Performance and Stability of Magnetorheological Fluids Containing Carbon Nanotube-Co0.4Fe0.4Ni0.2 Nanocomposite Particles

“…Although MR fluids exhibit strong potential for use in industrial applications, a major problem inhibits their practical implementation: poor long-term stability due to rapid sedimentation of the magnetic particles. ,,, Because of a large density mismatch between the magnetic particles and the carrier medium in MR fluids, the particles quickly settle, substantially shortening an MR fluid’s lifetime . As a solution to this problem, researchers have attempted to fabricate magnetic composites by combining magnetic particles with low-density materials and using the resultant composites to prepare MR fluids. − This method enhances the long-term stability of MR fluids by reducing the density of the magnetic materials. In addition, the long-term stability can be improved by controlling the shape of magnetic composite materials.…”

Effects of annealing on the structural and magnetic properties of flame spray pyrolyzed MnFe2O4 nanoparticles

“…Two dominant peaks are observed in the high‐resolution spectrum of Mn2p deconvolved according to the Lorentzian–Gaussian model (Figure 4B). These peaks correspond to Mn2p 1/2 (653.2 eV) and Mn2p 3/2 (641.2 eV) of Mn 2+ in its oxidized state with the splitting binding energy difference of 12 eV 43–45 . In spinel ferrite with a general formula MFe 2 O 4 (M = Mn 2+ , Ni 2+ , Co 2+ , etc.…”

“…These peaks correspond to Mn2p 1/2 (653.2 eV) and Mn2p 3/2 (641.2 eV) of Mn 2+ in its oxidized state with the splitting binding energy difference of 12 eV. [43][44][45] In spinel ferrite with a general formula MFe 2 O 4 (M = Mn 2+ , Ni 2+ , Co 2+ , etc. ), there is a cubic close-packed oxygen lattice with metal ions occupying 1/8 of the tetrahedral and 1/2 of the octahedral voids.…”