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The Stability and Oxidation Resistance of Iron- and Cobalt-Based Magnetic Nanoparticle Fluids Fabricated by Inert-Gas Condensation

Published online by Cambridge University Press:  01 February 2011

Nguyen H. Hai ,
Raymond Lemoine ,
Shaina Remboldt ,
Michelle A. Strand ,
Steve Wignall ,
Jeffrey E. Shield  and
Diandra Leslie-Pelecky
Nguyen H. Hai
Affiliation:
Department of Physics & Astronomy and Center for Materials Research & Analysis, University of Nebraska — Lincoln, Lincoln NE 68588-0111, U.S.A.
Raymond Lemoine
Affiliation:
Department of Physics & Astronomy and Center for Materials Research & Analysis, University of Nebraska — Lincoln, Lincoln NE 68588-0111, U.S.A.
Shaina Remboldt
Affiliation:
Department of Physics & Astronomy and Center for Materials Research & Analysis, University of Nebraska — Lincoln, Lincoln NE 68588-0111, U.S.A.
Michelle A. Strand
Affiliation:
Southeast Community College- Milford, Milford, NE 68405, U.S.A.
Steve Wignall
Affiliation:
Seward High School, Seward NE, 68434, U.S.A.
Jeffrey E. Shield
Affiliation:
Department of Mechanical Engineering and Center for Materials Research & Analysis, University of Nebraska — Lincoln, Lincoln NE 68588-0656, U.S.A.
Diandra Leslie-Pelecky
Affiliation:
Department of Physics & Astronomy and Center for Materials Research & Analysis, University of Nebraska — Lincoln, Lincoln NE 68588-0111, U.S.A.
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Abstract

Magnetic nanoparticle fluids have numerous biomedical applications, including magnetic imaging, drug delivery, and hyperthermia treatment for cancer. Ideal magnetic nanoparticle fluids have well-separated, biocompatible nanoparticles with a small size distribution that form a stable colloid. We have combined inert-gas condensation, which produces nanoparticles with low polydispersity, with deposition directly into a surfactant-laden fluid to prevent agglomeration. Iron, cobalt, and iron-nitride nanoparticle fluids fabricated using inert-gas condensation have with mean particle sizes from 5–50 nm and remain stable over long periods of time. Iron and cobalt nanoparticles oxidize on exposure to air, with oxidation rates dependent on surfactant type and concentration. Iron-nitride fluids are more oxidation and corrosion resistant, while retaining the same high degree of colloidal stability. Magnetic properties vary depending on the nanoparticle size and material, but can be varied from superparamagnetic to ferromagnetic with coercivities on the order of 1000 Oe. In addition to future biomedical applications, inertgas condensation into fluids offers the opportunity to study interparticle interactions over a broad range of intrinsic materials parameters and interparticle separations.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 845: Symposium AA – Nanoscale Materials Science in Biology and Medicine , 2004 , AA5.44
Copyright
Copyright © Materials Research Society 2005

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