Metal-based magnetic fluids with core–shell structure FeB@SiO₂ amorphous particles

Abstract

FeB@SiO amorphous particles were firstly introduced into GaIn alloys to prepare metal-based magnetic fluids. The morphology of the FeB amorphous particles is spherical with an average particle size of about 190 nm. The shape of the particles is regular and the particle size is homogeneous. Stable core-shell structure SiO modified FeB amorphous particles are obtained and the thickness of the SiO coatings is observed to be about 40 nm. The results of VSM confirm that the saturation magnetization of the FeB amorphous particles is 131.5 emu g, which is almost two times higher than that of the FeO particles. The saturation magnetization of the FeB@SiO amorphous particles is 106.9 emu g, an approximate decrease of 18.7% due to the non-magnetic SiO coatings. The results from the torsional oscillation viscometer show that the metal-based magnetic fluids with FeB amorphous particles exhibit a desirable high temperature performance and are ideal candidates for high temperature use.

Mussel-Inspired Multifunctional Integrated Liquid Metal-Based Magnetic Suspensions with Rheological, Magnetic, Electrical, and Thermal Reinforcement

“…Hence, the viscosity of the LMMS increases when enhancing the magnetic field. In general, the change in viscosity of the LMMS is the synergistic effect between magnetic particles and the liquid metal matrix when applying a magnetic field . Oscillatory tests were also implemented to further research the viscoelastic behavior of the LMMS and the curves are plotted in Figure d,e (the tests were taken only on mLMMS and mLMMS-15% samples for the same reason as above).…”

“…Under this circumstance, magnetic liquid metal comes into our sight as it has controllable properties and can realize noncontact or even remote manipulation under the magnetic field. To date, magnetic liquid metal has attracted extensive studies and three methods have been proposed to fabricate it, that is, magnetic particles internalized into liquid metal in a harsh acid solution, , doping SiO 2 -coated magnetic particles into the liquid metal, , or directly mixing magnetic particles with liquid metal. − Nevertheless, the magnetic particles may react with liquid metal when they contact each other and then damage their magnetism. ,, For some magnetic particles, coating SiO 2 on their surfaces can improve their compatibility with liquid metal and contribute to doping . However, it will weaken the electrical and thermal conductivity of magnetic liquid metal because SiO 2 is insulated.…”

3D Hollow Porous Spherical Architecture Packed by Iron-Borate Amorphous Nanoparticles as High-Performance Anode for Lithium-Ion Batteries

“…The cathodic peaks at 0.63 and 1.1 V are gradually shifted to 0.78 and 1.3 V, respectively. The difference between the first cathodic scan and the following cycles can be attributed to the decomposition of the electrolyte, the rearrangement of the structure, and the formation of the SEI films on the surface of the anode. , On the other hand, HP-FeBO-Ps have an amorphous character due to the low crystallinity, which might be more flexible for the insertion of lithium ions with a lower structural stress/strain due to the isotropic nature, long-range disorder characteristics, percolation pathways, and absence of grain boundaries. − Therefore, the change on the anode during cycling could be a gradual process, not an abrupt change as happened in crystalline Fe 3 O 4 (Figure S3), preventing the generation of high stress/strain and leading to the pulverization of the anode, which is beneficial for the integrity of the anode and the enhanced cycling performance …”

Critical Review on the Physical Properties of Gallium-Based Liquid Metals and Selected Pathways for Their Alteration

“…An intriguing approach to obtain switchable and highly reliable rheological properties is the addition of magnetic particles. For example, silica particles coated with FeB, Fe, , Gd, Ni, or Cu–Ni particles embedded in bulk liquid metal shows a magnetic response. For some of these composites, switchable rheological properties were observed.…”