1. Sub 5 nm magnetite nanoparticles: Synthesis, microstructure, and magnetic properties
- Author
-
Young Keun Kim, Jae Seon Ju, Sangsig Kim, Seung Pil Ko, Jun Hua Wu, and Hong Ling Liu
- Subjects
Materials science ,Coprecipitation ,Magnetism ,Mechanical Engineering ,Analytical chemistry ,Nanoparticle ,Condensed Matter Physics ,Microstructure ,law.invention ,SQUID ,Condensed Matter::Materials Science ,chemistry.chemical_compound ,chemistry ,Mechanics of Materials ,law ,Condensed Matter::Superconductivity ,General Materials Science ,High-resolution transmission electron microscopy ,Superparamagnetism ,Magnetite - 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.
- Published
- 2007
- Full Text
- View/download PDF