Thermal Plasma Synthesis of Superparamagnetic Iron Oxide Nanoparticles

Plasma Chemistry and Plasma Processing - Tập 32 - Trang 519-531 - 2012
Pingyan Lei1, Adam M. Boies1,2, Steven Calder1,3, Steven L. Girshick1
1Department of Mechanical Engineering, University of Minnesota, Minneapolis, USA
2Department of Engineering, University of Cambridge, Cambridge, UK
3Laboratory of Organic Chemistry, Wageningen University, Wageningen, The Netherlands

Tóm tắt

Superparamagnetic iron oxide nanoparticles were synthesized by injecting ferrocene vapor and oxygen into an argon/helium DC thermal plasma. Size distributions of particles in the reactor exhaust were measured online using an aerosol extraction probe interfaced to a scanning mobility particle sizer, and particles were collected on transmission electron microscopy (TEM) grids and glass fiber filters for off-line characterization. The morphology, chemical and phase composition of the nanoparticles were characterized using TEM and X-ray diffraction, and the magnetic properties of the particles were analyzed with a vibrating sample magnetometer and a magnetic property measurement system. Aerosol at the reactor exhaust consisted of both single nanocrystals and small agglomerates, with a modal mobility diameter of 8–9 nm. Powder synthesized with optimum oxygen flow rate consisted primarily of magnetite (Fe3O4), and had a room-temperature saturation magnetization of 40.15 emu/g, with a coercivity and remanence of 26 Oe and 1.5 emu/g, respectively.

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