NDLI: In Situ Synthesis of Silica-Coated Magnetite Nanoparticles by Reverse Coprecipitation Method

Content Provider	Springer Nature Link
Author	Kazemzadeh, H. Ataie, A. Rashchi, F.
Copyright Year	2011
Abstract	Silica-coated magnetite nanoparticles were synthesized by reverse coprecipitation of Fe$^{2+}$ and Fe$^{3+}$ with sodium hydroxide in the presence of sodium silicate solution. Effect of reaction conditions and various amounts of sodium silicate solution on the powder particle characteristics was investigated by X-ray diffraction (XRD), field emission-scanning electron microscopy (FE-SEM), Fourier transform infrared spectroscopy (FT-IR), laser particle size analyzer (LPSA), streaming current potential and vibrating sample magnetometer (VSM) techniques. Also, stability of silica-coated magnetite nanoparticles in the acidic condition has been studied by titration method. FT-IR results revealed that silica chemisorbed on the surface of magnetite nanoparticles by Fe–O–Si bonds. Analysis of the XRD patterns confirmed the formation of magnetite having spinel structure in the presence of sodium silicate solution. FE-SEM micrographs revealed that the mean particle size of spherical magnetite decreased from 50 to less than 25 nm by adding sodium silicate solution. Agglomeration declined when the volume ratio of sodium silicate/sodium hydroxide was 0.1. This was attributed to the coating of magnetite nanoparticles by silica. Coating of magnetite by silica prevents the formation of hydrogen bondings between magnetite and water molecules. Further increase in the sodium silicate concentration revealed a reverse effect.
Starting Page	2803
Ending Page	2808
Page Count	6
File Format	PDF
ISSN	15571939
Journal	Journal of Superconductivity and Novel Magnetism
Volume Number	25
Issue Number	8
e-ISSN	15571947
Language	English
Publisher	Springer US
Publisher Date	2011-08-25
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Nanoparticles Magnetite Reverse coprecipitation Silica coating Condensed Matter Physics Characterization and Evaluation of Materials Strongly Correlated Systems, Superconductivity Magnetism, Magnetic Materials
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Condensed Matter Physics

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