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Journal of Inorganic Materials

Journal of Inorganic Materials >

2008 , Vol. 23 >Issue 1: 33 - 38

DOI: https://doi.org/10.3724/SP.J.1077.2008.00033

Research Paper

Preparation of Core-shell SiO2/Fe3O4 Nanocomposite Particles via Sol-gel Approach

  • LIU Bing ,
  • WANG De-Ping ,
  • HUANG Wen-Hai ,
  • YAO Ai-Hua ,
  • Ioku Koji
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  • 1. School of Material Science and Engineering, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Advanced Civil Engineering Materials of the Ministry of Education, Tongji University, Shanghai 200092, China; 3. Graduate School of Environmental Studies, Tohoku University, Sendai 980-8579, Japan

Received date: 2007-01-19

  Revised date: 2007-03-22

  Online published: 2008-01-20

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Abstract

Core-shell structural SiO2/Fe3O4 nanocomposite particles with adjustable magnetic properties were prepared via a sol-gel process, in which the hydrolysis and condensation of TEOS were conducted on the surface of Fe3O4 nanoparticles under the aid of basic catalyst. The effects of the volume ratio of alcohol to water, the concentrations of ammonium and TEOS on the appearances and properties of the nanocomposite particles were investigated. The mechanism of the formation of SiO2/Fe3O4 nanocomposite particles was analyzed. Results show that silica shell is mainly formed from the aggregative growth of silica primary particles on the surface of Fe3O4 nanoparticles. With increasing the concentration of TEOS in the range of 0--0.02mol/L, the silica shell thickness increases on the condition of 0.3mol/L of NH4OH and 4:1 ratio of alcohol to water. Although the saturation magnetization of the nanocomposite particles decreases with the thickness of silica shell increasing, the coercive force of the particles is almost unchanged. And more, the nanocomposite particles remain favorable superparamagnetism.

Key words： sol-gel; core-shell structure; magnetite; silica

Cite this article

LIU Bing , WANG De-Ping , HUANG Wen-Hai , YAO Ai-Hua , Ioku Koji . Preparation of Core-shell SiO2/Fe3O4 Nanocomposite Particles via Sol-gel Approach[J]. Journal of Inorganic Materials, 2008 , 23(1) : 33 -38 . DOI: 10.3724/SP.J.1077.2008.00033

References

[1] Mornet S, Vasseur S, Grasset F, et al. J. Mater. Chem., 2004, 14 (14): 2161--2175.
[2] Liu X, Ma Z, Xing J, et al. J. Magn. Magn. Mater., 2004, 270 (1-2): 1--6.
[3] Yi D K, Lee S S, Georgia C, et al. Chem. Mater., 2006, 18 (3): 614--619.
[4] Mine E, Yamada A, Kobayashi Y, et al. Journal of Colloid and Interface Science, 2003, 264 (2): 385--390.
[5] Caruso R A, Antonietti M. Chem. Mater., 2001, 13 (10): 3272--3282.
[6] 廖振华, 陈建军, 姚可夫, 等(LIAO Zhen-Hua, et al). 无机材料学报(Journal of Inorganic Materials), 2004, 19 (4): 749--754.
[7] 陈令允, 李凤生, 姜炜, 等. 材料科学与工程学报, 2005, 23 (5): 556--559.
[8] Philipse A P, Bruggen M P B, Pathmamanoharan C. Langmuir, 1994, 10 (1): 92--99.
[9] Lu Y, Yin Y, Mayers B T, et al. Nano Letters, 2002, 2 (3): 183--186.
[10] 王德平, 娄敏毅, 黄文, 等. 同济大学学报(自然
科学版), 2005, 33 (2): 201--204.
[11] 汪秀全, 陈奇, 宋鹂, 等(WANG Xiu-Quan, et al). 无机材料学报(Journal of Inorganic Materials), 2006, 21 (1): 181--186.
[12] Bogush G H, Zukoski I V. Journal of Colloid and Interface Science, 1991, 142 (1): 19--34.
[13] Nagao D, Satoh T, Konno M. Journal of Colloid and Interface Science, 2000, 232 (1): 102--110.
[14] Nagao D, Kon Y, Satoh T, et al. Journal of Chemical Engineering of Japan, 2000, 33 (3): 468--473.
[15] Blaaderen A V, Geest J V, Vrij A. Journal of Colloid and Interface Science, 1992, 154 (2): 481--501.
[16] Nooney R I, Thirunavukkarasu D, Chen Y, et al. Langmuir, 2003, 19 (18): 7628--7637.
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