Thermal Plasma Synthesis of Superparamagnetic Iron Oxide Nanoparticles

被引：0
作者：
Pingyan Lei
Adam M. Boies
Steven Calder
Steven L. Girshick
机构：
[1] University of Minnesota,Department of Mechanical Engineering
[2] University of Cambridge,Department of Engineering
[3] Wageningen University,Laboratory of Organic Chemistry
来源：
Plasma Chemistry and Plasma Processing | 2012年 / 32卷
关键词：
Iron oxide; Nanoparticles; DC thermal plasma; Magnetic properties;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
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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页码：519 / 531
页数：12
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