Easy synthesis and characterization of γ-Fe2O3 nanoparticles for biomedical applications -: art. no. 10Q909

Easy syntheses of gamma-Fe2O3 nanoparticles have been fabricated by the sol-gel method. The powders present average particle size of 7, 10, and 13 nm with narrow size distribution for samples as-obtained and annealed at 150, 175, and 200 degrees C, respectively. At a room temperature, 10 nm particles were partially superparamagnetic. The Mossbauer spectrum for the 7 nm samples at room temperature displays superparamagnetic behavior as demonstrated by the single quadrupole doublet with zero hyperfine fields. Superparamagnetic particles display no sextet in Mossbauer spectra at temperatures above blocking temperature (T-B = 165 K for the 7 nm sample). (c) 2005 American Institute of Physics.