Synthesis of spherical submicron-sized magnetite/silica nanocomposite particles

Review: Bioanalytical applications of biomolecule-functionalized nanometer-sized doped silica particles

“…It also allows sequential synthesis, which can then produce the desired core/shell structure [49,50]. Kobayashi et al have proposed methods for producing silica-coated magnetite particles with the Stöber method in the presence of either magnetite nanoparticles [51], or, magnetite nanoparticles surface-modified with a silane coupling agent (carboxysilanetriol) [52]. These methods can produce silica-coated particles with either a single magnetite core, or, aggregates/larger particles with multiple cores, respectively.…”

Facile synthesis and magnetic properties of monodisperse Fe3O4/silica nanocomposite microspheres with embedded structures via a direct solution-based route

“…In general, Fe 3 O 4 /silica composites are mostly prepared in solution or by sol-gel process [43][44][45][46][47][48][49]. However, the synthesis in solution needs many steps, even in sol-gel routes, where the formation requires calcination processes of high temperature and it is difficult to control the size and morphologies of the final products.…”

“…Wang and his co-workers investigated the preparation of Fe 3 O 4 /silica composite microspheres via miniemulsion polymerization by injecting tetraethyl ortho-silicate (TEOS), Triton X-100, and water into ferrofluid of Fe 3 O 4 NPs [47] and submicron-size Fe 3 O 4 /silica core/shell microspheres by sol-gel method [48]. Kobayashi et al produced spherical submicron-sized Fe 3 O 4 /silica nanocomposite particles with size of 100 nm by the injection of colloid of magnetite nanoparticle into TEOS and ammonia [49]. In general, these methods need complicated synthetic steps, high reaction temperature, surfactant, and template.…”

Characterisation of binary (Fe3O4/SiO2) biocompatible nanocomposites as magnetic fluid

“…X-ray diffraction (XRD) measurements were performed at room temperature using a FK60-04 X-ray diffractometer with Cu radiation. Thermogravimetric analysis (TGA) was carried out using a TGA-PL analyser (England) from 25 C to 650 C under the nitrogen atmosphere with a heating rate of 5 C/min. Before the measurements, the samples were degassed at 160 C in a vacuum for 6 h. The Brunauer-Emmett-Teller (BET) method was utilised to calculate the specific surface areas by Quantachrome TPR Win v1.0 using nitrogen as the sorbate.…”

“…In the recent years, much effort has been devoted to the synthesis and characterisation of silica-coated MNPs including iron oxide NPs [20][21][22][23][24][25]. It is proved to be a robust way to fabricate magnetic nanocomposites, because the surface of magnetite has a strong affinity towards silica.…”