Magnetic studies of iron oxide nanoparticles coated with oleic acid and Pluronic® block copolymer

Authors

Marco Morales Torres, University of Nebraska - LincolnFollow
Tapan Kumar Jain, Department of Pharmaceutical Sciences, University of Nebraska Medical Center, Omaha, Nebraska 68198
V. Labhasetwar, Department of Pharmaceutical Sciences, University of Nebraska Medical Center, Omaha, Nebraska 68198 and Department of Biochemistry and Molecular Biology, University of Nebraska Medical Center, Omaha, Nebraska 68198
Diandra Leslie-Pelecky, University of Nebraska -- LincolnFollow

Date of this Version

May 2005

Comments

Published by American Institute of Physics. J. Applied Physics 97, 10Q905 (2005). ©2005 American Institute of Physics. Permission to use. http://jap.aip.org/jap/.

Abstract

We have prepared and studied iron-oxide nanoparticles coated with oleic acid (OA) and Pluronic® polymer. The mean diameter of the iron-oxide nanoparticles was 9.3(±)0.8 nm. Saturation magnetization values measured at 10 K varied from 66.1(±0.7) emu/g to 98.7(±0.5) emu/g. At 300 K the loops showed negligible coercive field. The peaks in zero-field-cooled susceptibility decreased from 280 to 168 K with increasing OA concentration up to 10.6 wt %, and remained nearly constant for higher concentrations. This suggests that incomplete coverage of the OA allows small, interacting agglomerates to form.