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 18.10.2010   Карта сайта     Language По-русски По-английски
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18.10.2010





Letter


Direct synthesis and characterization of mesoporous Fe3O4 through pyrolysis of ferric nitrate-ethylene glycol gel







Lingyun ChenCorresponding Author Contact Information, a, E-mail The Corresponding Author, E-mail The Corresponding Author, Zhen Lina, Chenglan Zhaoa, Yiyang Zhenga, Yang Zhoua and Hui Penga






a College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400030, PR China





Received 5 July 2010; 


revised 6 August 2010; 


accepted 15 August 2010. 


Available online 3 September 2010.









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 6 nm, 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 46 emu/g and 136 Oe, respectively. In addition, a possible growth mechanism of mesoporous Fe3O4 was also discussed.









Graphical abstract








Research highlights



right triangle, filled Mesoporous magnetite (Fe3O4) was successfully synthesized by direct pyrolysis of ferric nitrate-EG (EG = ethylene glycol) gel in a horizontal tube furnace in the air. right triangle, filled The as-prepared mesoporous Fe3O4 was formed by the loose agglomeration of nanoparticles with diameter of about 6 nm. right triangle, filled Mesoporous Fe3O4 with the BET surface area and total pore volume of 145 m2/g and 0.12 cm3/g were obtained at 400 °C for 12 h.






Keywords: Mesoporous Fe3O4; Ethylene glycol; Gel; Pyrolysis; Magnetic materials




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А Б В Г Д Е Ё Ж З И Й К Л М Н О П Р С Т У Ф Х Ц Ч Ш Щ Ъ Ы Ь Э Ю Я
  • Chen Wev .  honorary member of ISSC science council

  • Harton Vladislav Vadim  honorary member of ISSC science council

  • Lichtenstain Alexandr Iosif  honorary member of ISSC science council

  • Novikov Dimirtii Leonid  honorary member of ISSC science council

  • Yakushev Mikhail Vasilii  honorary member of ISSC science council

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