Deposition of Thick SiO Coatings to Carbonyl Iron Microparticles for Thermal Stability and Microwave Performance.

Thick dielectric SiO shells on the surface of iron particles enhance the thermal and electrodynamic parameters of the iron. A technique to deposit thick, 500-nm, SiO shell to the surface of carbonyl iron (CI) particles was developed. The method consists of repeated deposition of SiO particles with air drying between iterations.

Carbon Double Coated FeO@C@C Nanoparticles: Morphology Features, Magnetic Properties, Dye Adsorption.

This work is devoted to the study of magnetic FeO nanoparticles doubly coated with carbon. First, FeO@C nanoparticles were synthesized by thermal decomposition. Then these synthesized nanoparticles, 20-30 nm in size were processed in a solution of glucose at 200 °C during 12 h, which led to an unexpected phenomenon-the nanoparticles self-assembled into large conglomerates of a regular shape of about 300 nm in size.

Amino-Functionalized FeO@SiO Core-Shell Magnetic Nanoparticles for Dye Adsorption.

FeO@SiO core-shell nanoparticles (NPs) were synthesized with the co-precipitation method and functionalized with NH amino-groups. The nanoparticles were characterized by X-ray, FT-IR spectroscopy, transmission electron microscopy, selected area electron diffraction, and vibrating sample magnetometry. The magnetic core of all the nanoparticles was shown to be nanocrystalline with the crystal parameters corresponding only to the FeO phase covered with a homogeneous amorphous silica (SiO) shell of about 6 nm in thickness.

Deposition of a SiO Shell of Variable Thickness and Chemical Composition to Carbonyl Iron: Synthesis and Microwave Measurements.

Protective SiO coating deposited to iron microparticles is highly demanded both for the chemical and magnetic performance of the latter. Hydrolysis of tetraethoxysilane is the crucial method for SiO deposition from a solution. The capabilities of this technique have not been thoroughly studied yet.