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Spectroscopic and magnetic studies of highly dispersible superparamagnetic silica coated magnetite nanoparticles
- Source :
- Journal of Magnetism and Magnetic Materials. 433:254-261
- Publication Year :
- 2017
- Publisher :
- Elsevier BV, 2017.
-
Abstract
- Superparamagnetic behavior in aqueously well dispersible magnetite core-shell Fe3O4@SiO2 nanoparticles is presented. The magnetic properties of core-shell nanoparticles were measured with use of the DC, AC magnetometry and EPR spectroscopy. Particles where characterized by HR-TEM and Raman spectroscopy, showing a crystalline magnetic core of 11.5 ± 0.12 nm and an amorphous silica shell of 22 ± 1.5 nm in thickness. The DC, AC magnetic measurements confirmed the superparamagnetic nature of nanoparticles, additionally the EPR studies performed at much higher frequency than DC, AC magnetometry (9 GHz) have confirmed the paramagnetic nature of the nanoparticles. Our results show the excellent magnetic behavior of the particles with a clear magnetite structure, which are desirable properties for environmental remediation and biomedical applications.
- Subjects :
- Materials science
Magnetometer
Nanoparticle
Nanotechnology
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
Condensed Matter Physics
01 natural sciences
0104 chemical sciences
Electronic, Optical and Magnetic Materials
law.invention
symbols.namesake
Paramagnetism
chemistry.chemical_compound
Magnetic core
chemistry
Chemical engineering
law
symbols
0210 nano-technology
Electron paramagnetic resonance
Raman spectroscopy
Superparamagnetism
Magnetite
Subjects
Details
- ISSN :
- 03048853
- Volume :
- 433
- Database :
- OpenAIRE
- Journal :
- Journal of Magnetism and Magnetic Materials
- Accession number :
- edsair.doi...........5c64b0637cb718aa2a6d774262eecc46