A new CoFe2O4–Cr2O3–SiO2 fluorescent magnetic nanocomposite

Abstract

A combined sonochemical co-precipitaion method has been developed for the synthesis of a CoFe(2)O(4)-Cr(2)O(3)-SiO(2) magnetic nanocomposite. The synthesis involved the pre-synthesis of CoFe(2)O(4)-Cr(2)O(3) nanoparticles, which were subsequently coated with SiO(2) by treatment with tetraethyl orthosilicate. It was observed that the as-prepared CoFe(2)O(4)-Cr(2)O(3)-SiO(2) nanocomposite exhibits photoluminescence properties without the addition of any external fluorescent marker. The fluorescent magnetic nanoparticles (FMNPs) had a typical diameter of 30 ± 5 nm and a saturation magnetization of 5.1 emu g(-1) at room temperature. This as-prepared nanocomposite was used for staining cultured HeLa cells for fluorescence imaging.

A facile synthesis of nanocrystalline CoFe2O4 embedded one-dimensional ZnO hetero-structure and its use in photocatalysis

“…The starting material, cobalt ferrite nanopowders of size 20-30 nm, was prepared by a method previously reported by us [18,19] and its purity was found to be more than 99.5%. A total of 0.5 g CoFe 2 O 4 nanoparticles and 8.37 g of ZnCl 2 were added into 50 ml of PEG (polyethyleneglycol, MW = 400 g mol −1 ) with ultrasonic irradiation operating at a frequency 40 KHz and power of 40 kW (JEIO, Lab Companion Ultrasonic Bath, Model: 1505) till a well-dispersed CoFe 2 O 4 nanoparticle and ZnCl 2 in PEG solution were obtained.…”

Influence of Bi3+-doping on the magnetic and Mössbauer properties of spinel cobalt ferrite

“…The diamagnetic In 3+ ion of higher ionic radius enters more easily into the tetrahedral A-site by replacing Fe 3+ in spinel ferrite. 15 19 microwave absorbing properties 20 and superparamagnetic properties. 21 Cobalt ferrite (CoFe 2 O 4 ) is a versatile hard ferrite having a wide range of applications in various fields because of its strong magneto-crystalline anisotropy, 22 high coercivity, 23 high saturation magnetization, 24 and chemical stability.…”

Simultaneous effects of surface spins: rarely large coercivity, high remanence magnetization and jumps in the hysteresis loops observed in CoFe2O4nanoparticles

“…[1][2][3][4][5][6][7] Furthermore, theoretically nanoscale magnetic materials provide a highly controlled experimental system to study fundamental physics phenomena. [1][2][3][4][5][6][7] Furthermore, theoretically nanoscale magnetic materials provide a highly controlled experimental system to study fundamental physics phenomena.…”

“…15,16 Some of the novel behavior of nanoscale magnetic materials is derived from the finite size effects that occur in particles with dimensions up to 100 nm. Surface spins play multiple roles in nanoscale magnetic materials, which are summarized as follows: (1) The common phenomenon that the magnetization of a magnetic nanoparticle is smaller than that of the bulk counterpart has been attributed to the disorder of spins at the nanoparticle surface. Surface spins play multiple roles in nanoscale magnetic materials, which are summarized as follows: (1) The common phenomenon that the magnetization of a magnetic nanoparticle is smaller than that of the bulk counterpart has been attributed to the disorder of spins at the nanoparticle surface.…”