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http://dx.doi.org/10.5012/bkcs.2006.27.2.237

Synthesis of Magnetic Nanoparticles of Fe3O4 and CoFe2O4 and Their Surface Modification by Surfactant Adsorption  

Zhao, Shi Yong (Department of Chemistry, Shandong University)
Lee, Don-Geun (Department of Chemistry, Pukyong National University)
Kim, Chang-Woo (Department of Chemistry, Pukyong National University)
Cha, Hyun-Gil (Department of Chemistry, Pukyong National University)
Kim, Young-Hwan (Department of Chemistry, Pukyong National University)
Kang, Young-Soo (Department of Chemistry, Pukyong National University)
Publication Information
Bulletin of the Korean Chemical Society / v.27, no.2, 2006 , pp. 237-242 More about this Journal
Abstract
$Fe_3O_4$ and $CoFe_2O_4$ magnetic nanoparticles have been synthesized successfully in aqueous solution and coated with oleic acid. The solid and organic solution of the synthesized nanoparticles was obtained. Self-assembled monolayer films were formed using organic solution of these nanoparticles. The crystal sizes determined by Debye-Scherre equation with XRD data were found close to the particle sizes calculated from TEM images, and this indicates that the synthesized particles are nanocrystalline. Especially, EDS, ED, FT-IR, TGA/DTA and DSC were used to characterize the nanoparticles and the oleic acid adsorption, and it was found that oleic acid molecule on the $Fe_3O_4$ nanoparticle is a bilayer adsorption, while that on $CoFe_2O_4$ nanoparticle is single layer adsorption. The superparamagnetic behavior of the nanoparticles was documented by the hysteresis loop measured at 300 K.
Keywords
Magnetic nanoparticles; Surfactant adsorption; $Fe_3O_4$; $CoFe_2O_4$;
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