Chemical Synthesis of Magnetic Nanoparticles for Permanent Magnet Applications

Abstract

Permanentm agnets are ac lass of critical materials for information storage, energy storage, and other magnetoelectronic applications. Compared with conventional bulk magnets, magnetic nanoparticles (MNPs) showu nique sizedependentm agnetic properties, which make it possible to control and optimize their magnetic performance for specific applications. The synthesis of MNPs has been intensively explored in recent years. Among different methods developed thus far,c hemical synthesis based on solution-phase reactions has attracted much attention owing to its potential to achievet he desired size, morphology,s tructure, and magnetic controls. This Minireview focuses on the recent chemical syntheses of strongly ferromagnetic MNPs (H c > 10 kOe) of rare-earth metals and FePt intermetallic alloys. It further discusses the potential of enhancing the magnetic performance of MNP composites by assembly of hard and soft MNPs into exchange-coupled nanocomposites.H igh-performance nanocomposites are key to fabricating superstrong permanent magnets form agnetic, electronic, and energy applications.[a] Dr.

Metrology of convex-shaped nanoparticles via soft classification machine learning of TEM images

“…This mode of imaging is often used to study nanoparticles containing higher atomic number(s) and/or compositional variations, e.g., core-shell nanoparticles [51][52][53] . Magnetic nanoparticles, such as those of iron, exhibit unique magnetism that can be systematically tuned by their size and shape, and as a result have been extensively researched for applications in data storage 54 , catalysis 55 and biomedicine 56,57 properties are ideally suited for use in bio-imaging and magnetic hyperthermia.…”

Effects of Process Variables on Properties of CoFe2O4 Nanoparticles Prepared by Solvothermal Process

“…It has been widely reported that particle size, shape, composition, and structural defects are important factors that strongly influence the magnetic behaviors and, consequently, applications of the CoFe 2 O 4 nanoparticles [14,15]. For example, the ferromagnetic CoFe 2 O 4 nanoparticles have the advantages for permanent magnet applications such as magnetic recording and energy storage [16], while the superparamagnetic CoFe 2 O 4 nanoparticles have the merits for biomedical applications such as hyperthermia treatment, drug delivery, and cancer therapy [17]. The CoFe 2 O 4 nanoparticles could be synthesized by various methods including sol-gel combustion [18], thermal decomposition [19], co-precipitation [5], microemulsion [20], and solvothermal [21] and polyol [22] approaches.…”

Green Approach for Preparation of New Hybrids of 5‐Substituted‐1H‐Tetrazoles Using Novel Recyclable Nanocatalyst based on Copper(II) Anchored onto Glucosamine Grafted to Fe3O4@SiO2

“…[30][31][32][33] Moreover, the potential advantages of heterogeneous catalysis, including non-tedious recycling process, easy process handling, overall lower costs, the minimization of toxic metal in products, and furthermore, in some cases they are even more selective than homogeneous counterparts. [34,35] Among all heterogeneous catalysts, superparamagnetic nanoparticles have been intensively considered due to their large surface area and scientific applications including magnetic field assisted transport, [36] medical imaging, [37] drug delivery, [38] and magnetic bioseparations. [39] However, having magnetic dipolar attractions in naked magnetic nanoparticles (MNPs) such as magnetite (Fe 3 O 4 ), the aggregation of pure MNPs is unlikely inevitable.…”