Preparation of hydrophilic magnetic nanospheres with high saturation magnetization

Morphological studies of randomized dispersion magnetite nanoclusters coated with silica

“…The relatively low intensity reflections and no significant sharp diffraction peaks for SCM2 spectrum are probably due to the presence of surface SiO 2 on the surface of magnetic nanoparticles. Xu et al also suggested that the low intensity of reflection peaks could be attributed to the ultrafine crystalline of the magnetite particles present in the silica coated nanoclusters [43]. The XRD results indicate that the nanoclusters of magnetite coated with silica have been successfully prepared without the alteration to the crystal structure of magnetite nanoparticles and the crystallinity of the magnetite is well preserved although the nanoparticles have been modified superficially with silica and citrate ions.…”

Improvement of the stability and activity of immobilized trypsin on modified Fe3O4 magnetic nanoparticles for hydrolysis of bovine serum albumin and its application in the bovine milk

“…The coating substance, GA, diminish the force exerted by an external magnetic field on the nanoparticles owing to the difficult alignment of magnetic dominions in the material. Therefore, magnetization value of coated particle is smaller than that of uncoated one, and magnetization can be even more reduced by immobilization (Xu, Tong, Cui, Lu, & Gu, 2007).…”

Polypyrrole/magnetic nanoparticles composite as an efficient sorbent for dispersive micro-solid-phase extraction of antidepressant drugs from biological fluids

“…They have large constant magnetic moments and can be easily gathered by applying an external magnetic field placed outside of the extraction container without additional centrifugation or filtration of the sample, which makes sampling and collection simpler and faster (Tahmasebi and Yamini, 2012;Ahmad Panahi and Alaei, 2014;Ahmad Panahi and Nasrollahi, 2014). MNPs such as Fe3O4 are suitable candidates for magnetic carrier technology by considering their main advantages, including: (1) MNPs can be produced in large quantity using a simple method; (2) their sorption capacity is high due to their large surface area; (3) they show strong magnetic properties and low toxicity (Shen et al, 2015, Xu et al, 2007; and (4) these particles are super paramagnetic, that means metal-loaded sorbent can be easily isolated from the treated sample via an external magnetic field. However, the disadvantages of utilizing MNPs for sample preparation are their low selectivity toward target analytes, low stability in strong acidic aqueous media and low dispersibility in various sample matrices.…”