Magnetic alloys in nanoscale biomaterials
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oparticles are ideal for construction of nanostructured materials with adjustable physical and chemical properties that are not characteristic of the atom or the bulk compound. Based on their unique properties, and coupled with nanofibers, they offer great potential for biomedical applications such as drug delivery, gene delivery arrays, and tissue repair. For example, superparamagnetic particles that are functionalized with specialized drugs are an effective and surprisingly simple technique for targeted drug delivery.[1,2] Magnetic properties of more complex biocompatible systems may prove useful in other applications. The integration of vertically aligned carbon nanofibers (VACNFs) within the intracellular domains of viable cells[3] proves that they have promising biocompatible properties at the nanoscale. A variety of ferromagnetic metals and their alloys have been used as catalysts for the synthesis of these carbon nanostructures.[4] Here, we explore the magnetic properties of Fe alloys that may be used as catalysts for growing VACNFs for use as transducers at the nanoscale. We present some preliminary studies on synthesis and physical properties of VACNFs formed with Fe-Co alloy catalysts, which to our knowledge have T. LEVENTOURI and K.D. SORGE are with the Department of Physics and Center for Biological and Materials Physics, Florida Atlantic University, Boca Raton, FL 33431. Contact e-mail: [email protected] A.V. MELECHKO, T.E. McKNIGHT, and M.L. SIMPSON are with the Molecular Scale Engineering and Nanoscale Technologies Research Group, Oak Ridge National Laboratory, and Center for Nanophase Materials Science, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6056, and the Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN 37996-2200. K.L. KLEIN is with the Department of Materials Science and Engineering, University of Tennessee, and the Center for Nanophase Materials Science, Oak Ridge National Laboratory. J.D. FOWLKES and P.D. RACK are with the Department of Materials Science and Engineering, University of Tennessee. I.M. ANDERSON, formerly with the Microscopy, Microanalysis, Microstructures, Metals and Ceramics Division, Oak Ridge National Laboratory, is with the National Institute of Standards and Technology, Surface and Microanalysis Science Division, Gaithersburg, MD 20899-8371. J.R. THOMPSON is with the Department of Physics and Astronomy, University of Tennessee, and the Materials Science and Technology Division, Oak Ridge National Laboratory. This article is based on a presentation made in the symposium entitled ‘‘Fourth International Alloy Conference,’’ which occurred in Kos, Greece, from June 26 to July 1, 2005, and was sponsored by Engineering Conferences International (ECI) and co-sponsored by Lawrence Livermore National Laboratory and Naval Research Laboratory, United Kingdom. METALLURGICAL AND MATERIALS TRANSACTIONS A
not been reported previously. This is distinguished from fabrication of nanocrystalline Fe-Co nanowires inside carbon nanotubes.[5] II.
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