Preparation of Maghemite-Silica Nanocomposites Using Sol-Gel Technique

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Superparamagnetic maghemite nanoparticles were successfully produced using Massart’s procedure. Nanocomposites consisting of the synthesized maghemite nanoparticles and silica were produced by dispersing the as-synthesized maghemite nanoparticles into the silica xerogel, which was prepared by sol-gel technique. The system was then heated for 3 days at 140oC. A variety of weight ratios of Fe2O3/SiO2 was investigated. The nanocomposites were characterized using TGA, XRD, TEM and AGM. TGA thermogram showed one significant weight loss at around 250oC. It was caused by dehydration and evaporation of solvent from sol-gel process. XRD showed that the dispersed particles were still maghemite. TEM micrographs showed that the maghemite nanoparticles were in spherical shape and they were homogeneously incorporated in the silica matrix. The values of magnetization at 10kOe applied field were in the range of 1.79emu/g to 9.53emu/g depending of the Fe2O3/SiO2 ratio. Reduction of average crystallite size of dispersed maghemite particles was observed after encapsulation process. Increasing weight ratio of Fe2O3/SiO2 caused increase of the average crystallite size of maghemite nanoparticles.

Info:

Periodical:

Advanced Materials Research (Volumes 97-101)

Edited by:

Zhengyi Jiang and Chunliang Zhang

Pages:

2140-2143

DOI:

10.4028/www.scientific.net/AMR.97-101.2140

Citation:

B. C. Ang and I. I. Yaacob, "Preparation of Maghemite-Silica Nanocomposites Using Sol-Gel Technique", Advanced Materials Research, Vols. 97-101, pp. 2140-2143, 2010

Online since:

March 2010

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Price:

$35.00

[1] J.I. Martin, J. Nogues, K. Liu, J.I. Vicent and I.K. Schuller: J. Magn. Magn. Mater. Vol. 256 (2003), p.449.

[2] Ajax Kumar Gupta and Mona Gupta: J. Biomaterials Vol. 26 (2005), p.3995.

[3] L. Vekas, Doina Bica and Oana Marinica: Romanian Reports in Physics Vol. 58 No. 3, (2006), p.257.

[4] L1. Casas, A. Roig, E. Rodriguez, E. Molins, J. Tejada and J. Sort: J. of non-crystalline solids Vol. 285 (2001), p.37.

[5] A. Bee, R. Massart and S. Neve: Journal of Magn. Material Vol. 149 (1995), p.6.

[6] A.G. Roca, M.P. Morales, K.O. Grady and C.J. Serna: J. Nanotechnology Vol. 17 (2006), p.2783.

[7] J.P. Rainho, J. Rocha, L.D. Carlos and R.M. Almeida: J. Mater. Res. Vol. 16 (2001), p.2369.

[8] E. Barrado, J.A. Rodriguez, F. Prieto and J. Medina. J. of non crystalline solids Vol. 351 (2005), p.906.

[9] S. Gubbala, H. Nathani, K. Koizol and R.D.K. Misra: J. Physica B, Vol. 348 (2004), p.317.

[10] B.C. Ang and I.I. Yaacob: Journal of Materials Processing Technology. Vol. 191(2007).

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