Phase and surface area studies of maghemite nanoparticles dispersed in silica gel

Ang, B.C. and Yaacob, I.I. and Wong, Y.H. (2014) Phase and surface area studies of maghemite nanoparticles dispersed in silica gel. Materials Research Innovations, 18 (S6). S6-32-S6-35. ISSN 1432-8917, DOI

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First, the superparamagnetic maghemite nanoparticles were synthesised using Massart's procedure. Then, the nanocomposites of the synthesised maghemite nanoparticles and silica were produced by dispersing the as-synthesised maghemite nanoparticles into the silica xerogel prepared by sol–gel technique. The system was then heated for 3 days at 140°C. The phase analysis performed using X-ray diffraction confirmed that the as-synthesised nanoparticles and the nanoparticles within the silica gel were maghemite. Surface characteristic of the nanocomposite was evaluated by N2 adsorption. The ‘pure’ silica gel and maghemite nanoparticles showed high values of surface area (150–160 m2 g−1), while the surface area of nanocomposite was less than 40 m2 g−1. This was probably due to the formation of dense structures caused by incorporation of maghemite nanoparticles within the pores of silica gel. The pore width increased with increasing content of maghemite nanoparticles.

Item Type: Article
Uncontrolled Keywords: Maghemite; Magnetic nanoparticles; Massart's procedure; Sol–gel; Nanocomposite
Subjects: T Technology > T Technology (General)
Divisions: Faculty of Engineering
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 11 Mar 2015 04:59
Last Modified: 11 Mar 2015 04:59

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