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http://dx.doi.org/10.4283/JKMS.2016.26.6.190

Effect of Pressure on the Magnetic Properties of Magnetite Nanoparticles Synthesized Using a High Pressure Homogenizer  

Ji, Sung Hwa (Department of Research & Development, ILSHINAUTOCLAVE CO.)
Kim, Hyun Hyo (Department of Research & Development, ILSHINAUTOCLAVE CO.)
Kim, Hyojin (Department of Materials Science and Engineering, Chungnam National University)
Publication Information
Journal of the Korean Magnetics Society / v.26, no.6, 2016 , pp. 190-195 More about this Journal
Abstract
We report the effect of pressure varying from 0 to 1500 bar on the magnetic properties of magnetite nanoparticles synthesized from $Fe(OH)_2$ suspension using a high pressure homogenizer without any dispersing agent and oxidant. The observed X-ray diffraction (XRD) patterns showed that all the synthesized nanoparticles had the inverse spinel structure of magnetite. It was found from transmission electron microscopy (TEM) and XRD analysis that the average size of the synthesized magnetite particles could be controlled by the pressure of the high pressure homogenizer. The average particle size was found to range from 21 to 26 nm and decrease with increasing pressure. Magnetic hysteresis measurements performed at room temperature using a vibrating sample magnetometer (VSM) revealed the appearance of a superparamagnetic behavior in the magnetite nanoparticles synthesized at a pressure of 1500 bar.
Keywords
magnetite; nanoparticle; superparamagetism; high pressure homogenizer;
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