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Development of high magnetization Fe3O4/polystyrene/silica nanospheres via combined miniemulsion/emulsion polymerization
- Source :
- Journal of the American Chemical Society. 128(49)
- Publication Year :
- 2006
-
Abstract
- Monodispersed, hydrophilic, superparamagnetic magnetic nanospheres with a high fraction of magnetite were synthesized by combining modified miniemulsion/emulsion polymerization and sol-gel technique for the first time. The surface of the nanospheres was coated by a silica layer with controlled thickness. Transmission electron microscopy experimental results showed well-proportioned, equal-sized, magnetite/polystyrene (Fe3O4/PS) nanospheres with a thin silica shell. Based on the TGA data, the fraction of magnetite in the Fe3O4/PS nanospheres core was estimated to be 80 wt %. Magnetization measurements indicated that the superparamagnetic nature of the nanospheres had high saturation magnetization of 40 emu/g at 300 K. The procedures of the novel synthesis are described in detail. Also discussed are the mechanisms of the novel combined miniemulsion/emulsion polymerization processes.
- Subjects :
- Polymers
Emulsion polymerization
General Chemistry
Silicon Dioxide
Biochemistry
Ferric Compounds
Catalysis
Nanostructures
Miniemulsion
chemistry.chemical_compound
Magnetization
Magnetics
Colloid and Surface Chemistry
chemistry
Chemical engineering
Transmission electron microscopy
Polymer chemistry
Polystyrenes
Emulsions
Particle size
Polystyrene
Particle Size
Magnetite
Superparamagnetism
Biotechnology
Subjects
Details
- ISSN :
- 00027863
- Volume :
- 128
- Issue :
- 49
- Database :
- OpenAIRE
- Journal :
- Journal of the American Chemical Society
- Accession number :
- edsair.doi.dedup.....7b21cf63cd666acc7160624a1c0cc72a