2011 Design of Medical Devices Conference Abstracts

Synthesis of Silica-Coated Iron Oxide Nanoparticles for Magnetic Resonance Contrast Enhancement and Thermal Therapies PUBLIC ACCESS

[+] Author and Article Information
Steven Calder, Adam Boies, Pingyan Lei, Steven Girshick

University of Minnesota

J. Med. Devices 5(2), 027534 (Jun 14, 2011) (1 page) doi:10.1115/1.3591376 History: Published June 14, 2011; Online June 14, 2011

Superparamagnetic iron oxide nanoparticles are of interest for use as magnetic resonance imaging contrast agents and in thermal therapies. Silica nanoparticle coatings can increase the thermal stability of particles and provide a biologically inert surface for the attachment of functionalizing ligands. In this study, silica-coated magnetic iron oxide nanoparticles were produced by synthesizing core iron oxide nanoparticles in a thermal plasma followed by coating the particles with silica by photoinduced chemical vapor deposition (photo-CVD). Core particles were shown to be superparamagnetic with a maximum saturation magnetization of 29 emu/g. The photo-CVD process produced silica coatings with thicknesses up to 6 nm. Coatings were found to consist of conformal high-purity silica. The presence of the coating was found to decrease the saturation magnetization when evaluated on a total mass basis (iron oxide and silica).

Copyright © 2011 by American Society of Mechanical Engineers
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