MRS Proceedings

Articles

Characterization of Fe3O4 and Fe2O3 ferrogels prepared under uniform magnetic field

2011 MRS Fall Meeting.

Kamlesh J. Suthara1, Muralidhar K. Ghantasalaa2, Jan Ilavskya1 and Derrick C. Mancinia1a3

a1 Advanced Photon Source, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, IL – 60439

a2 Department of Mechanical and Aeronautical Engineering, Western Michigan University, 1903, West Michigan Avenue, Kalamazoo, MI – 49008

a3 Center for Nanoscale Materials, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, IL – 60439

ABSTRACT

We compare the characteristics of ferrogels prepared with and without the presence of a uniform magnetic field using Fe3O4 and Fe2O3 nanoparticles immobilized in hydrogels of N-isopropylacrylamide. The spatial distribution and agglomeration of the nanoparticles within the ferrogels were investigated using ultra small angle x-ray scattering (USAXS) and transmission electron microscopy (TEM). Hydrated ferrogels were also studied for magnetization using direct current superconducting quantum interference device (DC-SQUID). Volume size distribution resulting from USAXS data of the Fe3O4-ferrogel prepared under a uniform 225 G magnetic field showed a single broad peak appreciably different from that prepared without magnetic field with three distinct peaks. Volume size distributions resulting from USAXS data of the Fe2O3-ferrogel prepared with and without the presence of a uniform magnetic field both similarly show two peaks. Nanoparticle agglomeration was also determined by analyzing TEM images of ferrogel samples. DC-SQUID measurements of Fe3O4-ferrogel prepared in the presence of a uniform magnetic field showed 9% higher magnetization compared to the Fe3O4-ferrogel prepared without magnetic field. Similarly, DC-SQUID measurements of Fe2O3-ferrogel prepared in the presence of a uniform magnetic field showed 3% higher magnetization compared to the Fe2O3-ferrogel prepared without magnetic field. Thus, the presence of a uniform magnetic field during ferrogel polymerization can enabled the enhancement of the magnetoelastic property of the ferrogel.

Key Words:

  • polymer;
  • magnetic properties;
  • sol-gel
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