1. Direct synthesis and characterization of mesoporous Fe3O4 through pyrolysis of ferric nitrate-ethylene glycol gel
- Author
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Chen, Lingyun, Lin, Zhen, Zhao, Chenglan, Zheng, Yiyang, Zhou, Yang, and Peng, Hui
- Subjects
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ORGANIC synthesis , *MESOPOROUS materials , *PYROLYSIS , *FERRIC nitrate , *ETHYLENE glycol , *THERMOGRAVIMETRY , *AGGLOMERATION (Materials) , *MAGNETIC materials - Abstract
Abstract: Mesoporous magnetite (Fe3O4) was successfully synthesized on a large scale by direct pyrolysis of ferric nitrate-EG (EG=ethylene glycol) gel in a one-end closed horizontal tube furnace in the air without using any template, additions, and carrier gas. The as-synthesized mesoporous Fe3O4 were characterized by powder X-ray diffraction (XRD), infrared spectra (IR), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED), Brunauer–Emmett–Teller (BET), Barrett–Joyner–Halenda (BJH), and thermal gravimetric analysis (TGA). Results from TEM showed that the as-obtained Fe3O4 has mesoporous structure formed by the loose agglomeration of nanoparticles with diameter of about 6nm, which was also confirmed by small-angle XRD and nitrogen adsorption analysis. Furthermore, vibrating sample magnetometer (VSM) measurements indicated that the saturated magnetization of the as-obtained mesoporous Fe3O4 was ferromagnetic with the saturation magnetization (Ms) and coercivity (Hc) of 46emu/g and 136Oe, respectively. In addition, a possible growth mechanism of mesoporous Fe3O4 was also discussed. [ABSTRACT FROM AUTHOR]
- Published
- 2011
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