Fast and Controllable Synthesis of Core–Shell Fe₃O₄–C Nanoparticles by Aerosol CVD

Abstract

A method for simple and fast (30−60 s) synthesis of spherical "Fe 3 O 4 core−carbon shell" structures by atmospheric pressure aerosol pyrolysis of benzoic acid in dimethylformamide solutions containing dispersed Fe 3 O 4 nanoparticles is described. It has been experimentally shown that it is possible to control both the size of the core−shell particles and the size of Fe 3 O 4 grains and their amount in the particle core by the variation of benzoic acid concentration in solution and using pre-stabilized by mannitol iron oxide nanoparticles. It has been found that particles with an average size of 250−350 nm are formed at the concentration of benzoic acid in the range 0.5−1 mol/L. At a concentration of about 1 mol/L, preliminary stabilization of iron oxide nanoparticles by mannitol with a size of about 180 nm is performed.

Rare‐Earth Doped Iron Oxide Nanostructures for Cancer Theranostics: Magnetic Hyperthermia and Magnetic Resonance Imaging

“…[3,4,6] In addition, the magnetic properties of superparamagnetic nanoparticles depend on nanoparticle crystallite size, shape, and geometry. Therefore, researchers turned their attention on the fabrication of pure Fe 3 O 4 (magnetite) with tunable sizes and shapes, and its derivatives starting from core-shell geometries, [10][11][12][13][14][15][16][17][18][19] nanocomposites [20][21][22][23][24][25][26][27][28] to doped systems [29][30][31][32][33][34][35] having interesting magnetic, dielectric and chemical properties and applied them for advanced technological and biomedical applications. For example, bulk magnetite exhibits a saturation magnetization (M S ) of about 92 emu g -1 .…”

Iron oxide nanoparticles carried by probiotics for iron absorption: a systematic review

“…One example of a physical synthesis method is a laser-based method that applies aerosol organometallic precursors [ 49 ]. By varying the concentration of the benzoic acid in the solution and employing pre-stabilized mannitol IONPs, nanoparticle size can be controlled [ 50 ]. Laser ablation synthesis, which occurs when a pulsed laser fascicle interacts with a target material immersed in a liquid solution; this route can produce metal nanoparticles without any chemical stabilizers, although the size and shape are difficult to control [ 51 ].…”

Advances in the Optimization of Fe Nanoparticles: Unlocking Antifungal Properties for Biomedical Applications

“…Examples of physical techniques include gas deposition and electron beam lithography. Chemical techniques include hydrolysis [22], co-precipitation [23], sol-gel processes [24], pyrolysis [25], and chemical vapor deposition [26]. Biological methods refer to the utilization of various microbes and plant extracts to synthesize NPs [27,28].…”