Preparation of maghemite-silica nanocomposites using sol-gel technique
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 s...
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| Format: | Article |
| Language: | English |
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Trans Tech Publications, Switzerland
2010
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| Online Access: | http://irep.iium.edu.my/16409/ http://irep.iium.edu.my/16409/1/Preparation_of_Maghemite-Silica_Nanocomposites_Using.pdf |
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| author | Ang, Bee Chin Yaacob, Iskandar Idris |
| author_facet | Ang, Bee Chin Yaacob, Iskandar Idris |
| author_sort | Ang, Bee Chin |
| building | IIUM Repository |
| collection | Online Access |
| description | 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 140°C. 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 250°C. 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 Fe 2O3/SiO2 ratio. Reduction of average crystallite size of dispersed maghemite particles was observed after encapsulation process. Increasing weight ratio of Fe2O 3/SiO2 caused increase of the average crystallite size of maghemite nanoparticles. © (2010) Trans Tech Publications.
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| first_indexed | 2025-11-14T14:53:26Z |
| format | Article |
| id | iium-16409 |
| institution | International Islamic University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T14:53:26Z |
| publishDate | 2010 |
| publisher | Trans Tech Publications, Switzerland |
| recordtype | eprints |
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| spelling | iium-164092012-02-01T01:03:52Z http://irep.iium.edu.my/16409/ Preparation of maghemite-silica nanocomposites using sol-gel technique Ang, Bee Chin Yaacob, Iskandar Idris TJ Mechanical engineering and machinery 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 140°C. 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 250°C. 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 Fe 2O3/SiO2 ratio. Reduction of average crystallite size of dispersed maghemite particles was observed after encapsulation process. Increasing weight ratio of Fe2O 3/SiO2 caused increase of the average crystallite size of maghemite nanoparticles. © (2010) Trans Tech Publications. Trans Tech Publications, Switzerland 2010 Article PeerReviewed application/pdf en http://irep.iium.edu.my/16409/1/Preparation_of_Maghemite-Silica_Nanocomposites_Using.pdf Ang, Bee Chin and Yaacob, Iskandar Idris (2010) Preparation of maghemite-silica nanocomposites using sol-gel technique. Advanced Materials Research, 97-101. pp. 2140-2143. ISSN 1022-6680 http://www.scitec.ch/1022-6680/ 10.4028/www.scientific.net/AMR.97-101.2140 |
| spellingShingle | TJ Mechanical engineering and machinery Ang, Bee Chin Yaacob, Iskandar Idris Preparation of maghemite-silica nanocomposites using sol-gel technique |
| title | Preparation of maghemite-silica nanocomposites using sol-gel technique |
| title_full | Preparation of maghemite-silica nanocomposites using sol-gel technique |
| title_fullStr | Preparation of maghemite-silica nanocomposites using sol-gel technique |
| title_full_unstemmed | Preparation of maghemite-silica nanocomposites using sol-gel technique |
| title_short | Preparation of maghemite-silica nanocomposites using sol-gel technique |
| title_sort | preparation of maghemite-silica nanocomposites using sol-gel technique |
| topic | TJ Mechanical engineering and machinery |
| url | http://irep.iium.edu.my/16409/ http://irep.iium.edu.my/16409/ http://irep.iium.edu.my/16409/ http://irep.iium.edu.my/16409/1/Preparation_of_Maghemite-Silica_Nanocomposites_Using.pdf |