Back to Search
Start Over
Sonochemical approach to the synthesis of Fe(3)O(4)@SiO(2) core-shell nanoparticles with tunable properties
- Source :
- ACS Nano, ACS Nano, American Chemical Society, 2008, 2 (5), pp.847-856. ⟨10.1021/nn800091q⟩
- Publication Year :
- 2009
-
Abstract
- International audience; In this study, we report a rapid sonochemical synthesis of monodisperse nonaggregated Fe3O4@SiO2 magnetic nanoparticles (NPs). We found that coprecipitation of Fe(II) and Fe(III) in aqueous solutions under the effect of power ultrasound yields smaller Fe3O4 NPs with a narrow size distribution (4−8 nm) compared to the silent reaction. Moreover, the coating of Fe3O4 NPs with silica using an alkaline hydrolysis of tetraethyl orthosilicate in ethanol−water mixture is accelerated many-fold in the presence of a 20 kHz ultrasonic field. The thickness of the silica shell can be easily controlled in the range of several nanometers during sonication. Mössbauer spectra revealed that nonsuperparamagnetic behavior of obtained core−shell NPs is mostly related to the dipole−dipole interactions of magnetic cores and not to the particle size effect. Core−shell Fe3O4@SiO2 NPs prepared with sonochemistry exhibit a higher magnetization value than that for NPs obtained under silent conditions owing to better control of the deposited silica quantities as well as to the high speed of sonochemical coating, which prevents the magnetite from oxidizing.
- Subjects :
- Nanostructure
Materials science
Coprecipitation
Silicon dioxide
Macromolecular Substances
Surface Properties
Dispersity
Analytical chemistry
Molecular Conformation
General Physics and Astronomy
02 engineering and technology
010402 general chemistry
01 natural sciences
Ferric Compounds
Sonochemistry
Magnetite
chemistry.chemical_compound
Magnetics
Sonication
Core-shell nanoparticles
Ultrasound
Materials Testing
XPS
Nanotechnology
General Materials Science
Particle Size
Aqueous solution
Mössbauer spectroscopy
General Engineering
Silica
[CHIM.MATE]Chemical Sciences/Material chemistry
021001 nanoscience & nanotechnology
Silicon Dioxide
0104 chemical sciences
Nanostructures
FT-IR
chemistry
Chemical engineering
Magnetic nanoparticles
0210 nano-technology
Crystallization
Subjects
Details
- ISSN :
- 1936086X and 19360851
- Volume :
- 2
- Issue :
- 5
- Database :
- OpenAIRE
- Journal :
- ACS nano
- Accession number :
- edsair.doi.dedup.....ad0e275431c3afe4363808e49ae7187c