Synthesis and characterization of superparamagnetic composite nanorings
Longlan Cuia, 1, Hongchen Gua, , , Hong Xua, 1 and Donglu Shib
aInstitute of Micro and Nano Science and Technology, Shanghai Jiaotong University, 200030, Shanghai, China bDepartment of Chemical and Materials Engineering, University of Cincinnati, Cincinnati, OH 45221-0012, United States
Received 26 September 2005; accepted 6 February 2006. Available online 28 February 2006.
Superparamagnetic nanorings of polystyrene/Fe3O4 composite were synthesized by miniemulsion polymerization. The nanoring structure was characterized by using transmission electron microscopy, scanning electron microscopy, and atomic force microscopy. The results of X-ray diffraction identified the magnetic constituent of as-synthesized composite nanorings as Fe3O4. The magnetization measurement showed typical superparamagnetic characteristics of polystyrene/Fe3O4 nanorings.