Paul Bidwell-Hanson1, Monica Concha2, Sarah Helen DeLong1, Daniella Caruntu1, John B. Wiley1, and Charles J. O'Connor1. (1) University of New Orleans, New Orleans, LA, (2) Louisiana State University, Baton Rouge, LA
The magnetic behavior of two different superparamagnetic iron oxide nanoparticles(SPIONs) were compared using electron paramagnetic resonance (EPR). The differences were studied at the glass transition temperature of glycerol/methanol solutions. The area, the b-effective, and linewidth changed at the glass transition temperature for both SPIONs. SPIONs prepared from a precipitation reaction involving diethylene glycol were more sensitive to the glass transition temperature than SPIONs prepared in a simple aqueous red/ox reaction. Differences in the EPR spectra of the two SPION preparations suggest that surface defects are responsible for the magnetic behavior of the SPIONs.
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