Templated Synthesis of Magnetic Nanoparticles through the Self-Assembly of Polymers and Surfactants

Abstract

Abstract:The synthesis of superparamagnetic nanoparticles (NPs) for various technological applications continues to be an interesting research topic. The successful application of superparamagnetic NPs to each specific area typically depends on the achievement of high magnetization for the nanocrystals obtained, which is determined by their average size and size distribution. The size dispersity of magnetic NPs (MNPs) is markedly improved when, during the synthesis, the nucleation and growth steps of the reaction are well-separated. Tuning the nucleation process with the assistance of a hosting medium that encapsulates the precursors (such as self-assembled micelles), dispersing them in discrete compartments, improves control over particle formation. These inorganic-organic hybrids inherit properties from both the organic and the inorganic materials, while the organic component can also bring a specific functionality to the particles or prevent their aggregation in water. The general concept of interest in this review is that the shape and size of the synthesized MNPs can be controlled to some extent by the geometry and the size of the organic templates used, which thus can be considered as molds at the nanometer scale, for both porous continuous matrices and suspensions.

Analysis of the Interaction of Surfactants Oleic Acid and Oleylamine with Iron Oxide Nanoparticles through Molecular Mechanics Modeling

“…(The statistical size analysis were carried out for N > 50.) This is in agreement with Gao et al, 39 Yang et al, 40 and Nguyen et al 41 zero and a small, nonzero value), some particle agglomeration with passing time is inevitable. Figure 9 represents this graphically and qualitatively with an accompanying TEM image to show the resulting NPs.…”

Magnetic Fe@FeOx, Fe@C and α-Fe2O3 Single-Crystal Nanoblends Synthesized by Femtosecond Laser Ablation of Fe in Acetone

“…After drying on TEM grids, the particles synthesized in acetone form a particle network ( Figure 1 a–c), connected by a large amount of small clusters, which is a typical phenomenon after ferro-fluidic colloid drying [ 29 , 30 , 31 , 32 , 33 , 34 ]. The average size of the particles is estimated to be 5–6 nm ( Figure 1 d).…”

Synthesis and self‐assembly of multiple‐responsive magnetic nanogels

“…Furthermore, compared with the precursor IPN NGs, the D h of 8.1 wt% magnetic NGs decreased and was about 89 nm smaller than that of the IPN NGs. This may be due to the interaction of the iron oxide particles with polymer networks . Meanwhile, the polydispersity index of 8.1 wt% magnetic NGs was only 0.070, which was narrower than that of IPN.…”