Abstract
Magnetite (Fe3O4) nanoparticles are synthesized continuously in supercritical methanol (scMeOH) without using reducing agents at 30 MPa, 400 °C and a residence time of 38 s. XRD analysis reveals that particles synthesized in scMeOH retain magnetite crystalline structure while particles synthesized in supercritical water retain hematite (α-Fe 2O3) crystalline structure. The scMeOH acts both as a reaction medium and a reducing agent. The magnetite nanoparticles are spherical in shape with an average diameter of 21 ± 2 nm, as measured using SEM and TEM. The saturation magnetization of the magnetite nanoparticle is 76.6 emu/g. Crown
Original language | English |
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Pages (from-to) | 2197-2200 |
Number of pages | 4 |
Journal | Materials Letters |
Volume | 64 |
Issue number | 20 |
DOIs | |
Publication status | Published - 2010 Oct 31 |
Bibliographical note
Funding Information:This research was supported by Nano R&D program through the Korea Science and Engineering Foundation funded by the Ministry of Education, Science and Technology ( 2008-2002344 ). The authors acknowledge the Korea Research Council of Fundamental Science and Technology (KRCF) and the Korea Institute of Science and Technology (KIST) for ‘National Agenda Program (NAP)’ for additional support.
Keywords
- Magnetic materials
- Magnetite
- Nanomaterials
- Supercritical methanol
ASJC Scopus subject areas
- General Materials Science
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering