Abstract
Magnetite particles of 2-4 nm were synthesized by an economic, biocompatible chemical coprecipitation route, with their size tuned by the reaction temperature. The microstructure and morphology of the nanoparticles were characterized by X-ray diffraction (XRD) and high resolution transmission electron microscopy (HRTEM), whereas the magnetic properties were investigated by vibrating sample magnetometry (VSM) and superconducting quantum interference device (SQUID). It is found that the nanoparticles demonstrate well-defined superparamagnetic behavior as prepared and after annealing. Distinct lattices were observed which manifest the high crystallinity of such ultrasmall particles and the finite-size effect was revealed by analyzing the corresponding microstructure and magnetism.
| Original language | English |
|---|---|
| Pages (from-to) | 3124-3129 |
| Number of pages | 6 |
| Journal | Materials Letters |
| Volume | 61 |
| Issue number | 14-15 |
| DOIs | |
| Publication status | Published - 2007 Jun |
Bibliographical note
Funding Information:This work was supported by the Korea Research Foundation Grants KRF-2005-210-D00023 and KRF-2004-005-D00057, by the Grant A050750 of the Korea Health 21 R&D Project, Ministry of Health & Welfare, and by Grant M10500000105-05J0000-10510 from the National Research Laboratory Program of the Korea Science and Engineering Foundation.
Keywords
- Coprecipitation
- Magnetite
- Nanoparticle
- Superparamagnetism
ASJC Scopus subject areas
- General Materials Science
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering