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Author:

Xie Lin-Yan (Xie Lin-Yan.) | Li Qun-Yan (Li Qun-Yan.) | Wang Zhi-Hong (Wang Zhi-Hong.) | Wei Qi (Wei Qi.) | Nie Zuo-Ren (Nie Zuo-Ren.) (Scholars:聂祚仁)

Indexed by:

Scopus SCIE PKU CSCD

Abstract:

The home-made monodispersed SiO2 microspheres with uniform size (240 nm) were coated with beta-FeOOH by a multistep coating technique. The silica shell of beta-FeOOH hollow microspheres was coated on) beta-FeOOH hollow microspheres from simultaneous sol-gel polymerization of tetraethoxysilane(TEOS) in the presence of a cationic surfactant (cetyl trimethyl ammonium bromide; CTAB). The alpha-Fe2O3/mesoporous SiO2 hollow spheres were prepared after removal of the organic group by calcinating at 500 degrees C for 5 h in reducing atmosphere (a flowing gas mixture of H-2 and Ar (5%H-2/95%Ar (V/V), 350 degrees C, 3 h)) to produce the Fe3O4/mesoporous SiO2 hollow spheres. The results indicate that in the Fe3O4/mesoporous SiO2 hollow spheres, the Fe3O4 layers of about 60 nm are constructed with Fe3O4 nanorods interconnected. The composite hollow spheres are well monodispersecl and nearly uniform with an average diameter of 390 nm. BET calculation shows that the spheres have large surface area (693 m(2).g(-1), average pore size of 3.6 nm and pore volume of 0.63 cm(3).g(-1). Magnetic characterization shows that the Fe3O4/mesoporous SiO2 hollow spheres have magnetization saturation value of 13.6 emu .g(-1). The magnified hysteresis loop confirms the low coercive force (50 Oe) of the particles favorable for redispersion.

Keyword:

mesoporous hollow microsphere magnetic

Author Community:

  • [ 1 ] [Xie Lin-Yan]Beijing Univ Technol, Col Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 2 ] [Li Qun-Yan]Beijing Univ Technol, Col Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 3 ] [Wang Zhi-Hong]Beijing Univ Technol, Col Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 4 ] [Wei Qi]Beijing Univ Technol, Col Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 5 ] [Nie Zuo-Ren]Beijing Univ Technol, Col Mat Sci & Engn, Beijing 100124, Peoples R China

Reprint Author's Address:

  • [Li Qun-Yan]Beijing Univ Technol, Col Mat Sci & Engn, Beijing 100124, Peoples R China

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Source :

CHINESE JOURNAL OF INORGANIC CHEMISTRY

ISSN: 1001-4861

Year: 2010

Issue: 10

Volume: 26

Page: 1756-1760

0 . 7 0 0

JCR@2022

ESI Discipline: CHEMISTRY;

JCR Journal Grade:4

CAS Journal Grade:4

Cited Count:

WoS CC Cited Count: 9

SCOPUS Cited Count:

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 5

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