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• W2885575800 abstract "Generally, this study comprises of 3 stages. Firstly, pure maghemitenanoparticles were synthesized within 10nm size range. Secondly, the nanoparticleswere encapsulated into the silica xerogel matrix to minimize agglomeration andaggregation by producing nanocomposites. Finally, the surface area of thenanocomposites was increased by modifying the matrix into silica particulate form. Thenanoparticles and nanocomposites were characterized using XRD, TGA, TEM, BET,DLS and AGM.In stage I, the effects of varying the FeCl2 concentration on the properties ofmagnetic nanoparticles produced by Massart’s procedure were investigated. The latticeparameters of the samples obtained from XRD analysis revealed that the nanoparticlesformed were maghemites (γ-Fe2O3). The magnetization curves showed no hysteresis,indicating that the particles were superparamagnetic. The crystallite, magnetic andphysical sizes were similar, indicating that the particles were monocrystals. When theFeCl2 concentration increased from 0.1 to 1.0M, the size of as-synthesized maghemitenanoparticles decreased. However, when the FeCl2 concentration was increased further,the size of as-synthesized maghemite nanoparticles increased. This indicates that a verylow or a very high FeCl2 concentration leads to the formation of larger particles. Inaddition, agglomeration and aggregation occurred for most samples. Superparamagneticmaghemite nanoparticles with the smallest size were chosen to proceed to stage II andstage III.Maghemite-silica xerogel nanocomposites were produced by dispersing the assynthesizedmaghemite nanoparticles into silica xerogel by sol-gel technique. The phase analysis performed using XRD confirmed that the encapsulated nanoparticles weremaghemites. TEM micrographs showed that the maghemite nanoparticles werespherical and homogeneously incorporated into the silica xerogel matrix. The surfacearea of the nanocomposites was less than 40m2/g. This was probably due to the fact thatmajority of the pores in the silica gel were filled by as-synthesized maghemitenanoparticles. Reduction in average crystallite size of dispersed maghemite particleswas observed after the encapsulation process compared to as-synthesized maghemitenanoparticles. However, increasing the weight ratio of Fe2O3/SiO2 in nanocompositescaused an increase in average crystallite size of embedded maghemite nanoparticles.Maghemite-silica particulate nanocomposites were prepared by a modified solgelprocess. The purpose of changing the matrix from xerogel to particulate form was toincrease the surface area and retain its properties. It is a promising alternative techniquefor fabricating nanocomposites because it is simple, manufacturable, inexpensive, fast,can be prepared at room temperature and its ability to control the composition,crystalline distribution and properties of maghemite nanoparticles and nanocomposites.Moreover, no surfactant or other unnecessary precursor was involved. The HRTEMmicrograph revealed that the embedded particle (core) was with the presence of atomicinterspaces indicating that the particles were crystalline and covered with a noncrystallinematerial. The EELS result showed the presence of Fe-L3 signals, whichproves that the embedded particles were iron-based compounds. In stage III, a very highsurface area was attained for the produced nanocomposites (360 – 390 m2/g), comparedwith those of stage II. This enhances the sensitivity and the reactivity of thenanocomposites." @default.
• W2885575800 created "2018-08-22" @default.
• W2885575800 creator A5082784007 @default.
• W2885575800 date "2011-11-10" @default.
• W2885575800 modified "2023-09-23" @default.
• W2885575800 title "Synthesis and characterization of maghemite nanoparticles dispersed within silica matrix / Ang Bee Chin" @default.
• W2885575800 hasPublicationYear "2011" @default.
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