Novel synthesis of core–shell structured Fe3O4@SiO2 nanoparticles via sodium silicate

Preparation of Dual-Layered Core–Shell Fe3O4@SiO2 Nanoparticles and Their Properties of Plasmid DNA Purification

“…This noise indicates the possibility of an amorphous phase on the surface. The FT-IR spectra indicate the formation of an amorphous phase with Si-O-Si bonding on the surface of the Fe3O4 nanoparticles as an SiO2 coating layer [14]. The size and shape of the prepared Fe3O4 and Fe3O4@SiO2 nanoparticles are shown in the TEM images (Figure 3).…”

“…Since the core-shell structure could take advantage of both an Fe 3 O 4 core, which could control nanoparticles through its superparamagnetic properties, and an SiO 2 shell, which can be used for purifying biomaterials such as nucleic acid and antibodies, surface functionalization through silane grafting, and enhancing chemical and thermal stabilities, core-shell-structured Fe 3 O 4 @SiO 2 nanoparticles have received extensive attention, and a large number of studies have been conducted on the fabrication method and application of Fe 3 O 4 @SiO 2 nanoparticles [12][13][14][15][16]. Most fabrication studies of Fe 3 O 4 @SiO 2 nanoparticles have been conducted using the sol-gel method with silane precursors such as tetraethyl orthosilicate (TEOS) [6,13] and tetramethyl orthosilicate (TMOS) [2,3].…”

“…In the case of the dense Fe 3 O 4 @SiO 2 , noise was observed under the 40 • area and the width of each peak increased, especially at lower angles. This occurred because the surface of the Fe 3 O 4 nanoparticles was under stress between the Fe 3 O 4 core and the SiO 2 shell, and the inter-planar distance was slightly increased[14,27]. Additionally, this phenomenon occurred in the porous Fe 3 O 4 @SiO 2 and dual Fe 3 O 4 @SiO 2 .…”

“…This noise indicates the possibility of an amorphous phase on the surface. The FT-IR spectra indicate the formation of an amorphous phase with Si-O-Si bonding on the surface of the Fe 3 O 4 nanoparticles as an SiO 2 coating layer[14].Nanomaterials 2021, 11, x FOR PEER REVIEW 5 of 11 N-H bond 1630 cm −1…”

Fabrication and characterization of the Fe3O4@SiO2–rGO nanocomposite: a catalyst for multi-component reactions

“…This assembly indicates that SiO 2 and rGO were successfully spread on the nanoparticle surface. 41,42 The surface area and pore size distribution of the assynthesized Fe 3 O 4 @SiO 2 -rGO were investigated further using N 2 adsorption-desorption analysis. The N 2 adsorptiondesorption isotherms and the pore size distribution curve shown in Fig.…”