Preparation and Characterization of Nickel Ferrite-SiO₂/Ag Core/Shell Nanocomposites

Abstract

Magnetic composites with silver nanoparticles bonded to their surface were successfully prepared using a simple chemical method. By means of a sol-gel technique, nickel ferrite nanoparticles have been prepared and coated with silica to control and avoid their magnetic agglomeration. The structural and magnetic properties of the nanoparticles were studied in function of the annealing temperature. Then, silver nanoparticles were incorporated by hydrolysis-condensation of tetraethyl orthosilicate, which contains silver nitrate on the surface of the nickel ferrite-SiO2core/shell. Samples were characterized using X-ray diffraction, IR spectroscopy, SEM, and magnetometry. Results show that the silica covered the nickel ferrite nanoparticles and the silver nanoparticles remain stable in the surface of the composite.

Synthesis and Characterization of Core–Shell Magnetic Nanoparticles NiFe2O4@Au

“…The shell would ensure stability of NPs and provide ease of functionalization. Gold is commonly used for the synthesis of hybrid nanoparticles [7][8][9][10], and SiO 2 [11] or Ag [12] is sometimes also applied. The combination of the components of different chemical nature in such hybrid nanoparticles leads to the formation of a material with improved characteristics compared to its individual components.…”

“…The components enhance useful properties and eliminate the disadvantages of each material. Fe 3 O 4 [7,11,13], Fe [14], CoFe 2 O 4 [15,16], and NiFe 2 O 4 [12] are most often used as the cores of hybrid magnetic particles.…”

Structural studies of silica‐supported spinel magnesium ferrite nanorods for photocatalytic degradation of methyl orange

“…[11] After the reactions were completed, ferrites supported nanocatalysts were highly stable, recyclable, and magnetically retrievable. [12] These nanoparticles were synthesized using different methods such as chemical reduction method, hydrothermal method, [13] solid-state method and high energy milling, [14] microemulsions, [15] sol-gel method, [16] microwave method, [17] electrospinning, [18] co-precipitation method, [19] ultrasonic wave assisted and also under visible light irradiation method, [20,21] Stober methods, [22] polymeric precursor method, [23] mechano-chemistry, [24] combustion method, [25] green synthesis, [26] magnetic resonance imaging (MRI), [27] biomagnetic separations, [28,29] in biosensors [30] and biotechnology. [31] Magnesium ferrite materials have a wide range of applications, including cell labeling and sorting, high-density magnetic recording, microwave sensors, electronic devices, high-frequency devices, and radio frequency coils.…”

Facile synthesis of recoverable superparamagnetic AgFeO2@Polypyrrole/SiO2 nanocomposite as an excellent catalyst for reduction and oxidation of different dyes in wastewater

“…Yakob et al [38] synthesized CoFe 2 O 4 /SiO 2 ferrite nanocomposite of microstructural and optical properties for the photodegradation of MB. Blanco-Esqueda et al [39] prepared and characterized the nickel ferrite-SiO 2 /Ag core-shell nanocomposite. Torres-Rodríguez et al [40] synthesized cobalt-zinc ferrite and magnetite-SiO 2 nanocomposites powder for magnetic extraction of DNA.…”