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A Comparative Study of Characteristics of Ferrogels Prepared using Coated and Uncoated Fe3O4 Nanoparticles

Published online by Cambridge University Press:  31 January 2011

Kamlesh J. Suthar ,
Muralidhar K. Ghantasala ,
Derrick C. Mancini  and
Jan Ilavsky
Kamlesh J. Suthar
Affiliation:
kamleshkumar.suthar@wmich.edusuthar@anl.gov, Western Michigan University, Mechanical and Aeronuatical Engineering, Kalamazoo, Michigan, United States
Muralidhar K. Ghantasala
Affiliation:
m.ghantasala@wmich.edu, Western Michigan University, Mechanical and Aeronuatical Engineering, Kalamazoo, Michigan, United States
Derrick C. Mancini
Affiliation:
mancini@anl.gov, Argonne National Laboratory, Center for Nanoscale Materials, Argonne, Illinois, United States
Jan Ilavsky
Affiliation:
Ilavsky@anl.gov, Argonne National Laboratory, Advanced Photon Source, Argonne, Illinois, United States
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Abstract

This paper presents the results of our analysis of ferrogels prepared using uncoated and polyvinylpyrrolidone (PVP)-coated magnetite (Fe3O4) nanoparticles. The N-isopropylacrylamide (NIPAM) based hydrogel is used with 15-25 nm Fe3O4 nanoparticles different concentrations in the range 1.25 -14%. These samples were analyzed using ultra small angle x-ray scattering (USAXS), Transmission Electron Microscopy (TEM), and Direct-Current Superconducting Quantum Interference Devices (DC-SQUID) magnetometry. Samples prepared with polyvinylpyrrolidone (PVP) coated nanoparticles showed a better single particle distribution compared to uncoated samples. USAXS data indicated that the gels prepared using uncoated nanoparticles have a large two particle agglomerations. In both cases, the volume fraction of the particles in the gel is linearly proportional to the initial particle concentrations. The DC-SQUID magnetometry analysis indicated that the magnetic moment of the gel samples prepared with uncoated particles is ∼ 2emu/g compared to ∼1.5emu/g of those having coated particles.

Keywords

polymertransmission electron microscopy (TEM)magnetic properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1234: Symposium QQ – Responsive Gels and Biopolymer Assemblies , 2009 , 1234-QQ08-09
Copyright
Copyright © Materials Research Society 2010

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