Magnetic Phase Development of Iron Oxide-SiO{sub 2} Aerogel and Xerogel Prepared using Rice Husk Ash as Precursor

Journal Article · Thu Mar 11 00:00:00 EST 2010 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3377832· OSTI ID:21371681

Maamur, K N; Jais, U S; Yahya, S Y. S. ^[1]

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1. Faculty of Applied Sciences, Universiti Teknologi MARA (UiTM), 40450 Shah Alam, Selangor (Malaysia)

This study is aimed to produce iron incorporated silica aerogel and xerogel from rice husk ash. Two sol--gel chemistry routes have been used to synthesize both samples. Iron in the form of hydrated iron nitrate with compositions in the range of 3-17 wt%(Fe{sub 2}O{sub 3}/Fe{sub 2}O{sub 3}+SiO{sub 2}) were used as iron source. For aerogel samples, iron was added at the solution level whereas for xerogel samples, iron was added after the gelation. The synthesis of iron doped aerogel was done by supercritical drying at temperature about 250 deg. C and pressure of about 5.9 MPa (850 psi) while xerogel was formed by drying the aquagel in an oven at 110 deg. C for 24 hours. The iron doped aerogel and xerogel composites were further heated to various temperatures to obtain the magnetic phase. Results show that the only sample that signifies the presence of maghemite (gamma-Fe{sub 2}O{sub 3}) is the aerogel sample doped with 7.3 wt% iron at temperature 1100 deg. C while other samples show the presence of magnetite.

• OSTI ID: 21371681
• Journal Information: AIP Conference Proceedings, Vol. 1217, Issue 1; Conference: ICAMN-2007: International conference on advancement of materials and nanotechnology, Langkawi, Kedah (Malaysia), 29 May - 1 Jun 2007; Other Information: DOI: 10.1063/1.3377832; (c) 2010 American Institute of Physics; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ASHES
COMPOSITE MATERIALS
DOPED MATERIALS
DRYING
GELATION
IRON NITRATES
IRON OXIDES
MAGNETIC MATERIALS
MAGNETITE
NANOSTRUCTURES
PRECURSOR
SILICON OXIDES
SOL-GEL PROCESS
SYNTHESIS
X-RAY DIFFRACTION
CHALCOGENIDES
COHERENT SCATTERING
COMBUSTION PRODUCTS
DIFFRACTION
IRON COMPOUNDS
IRON ORES
MATERIALS
MINERALS
NITRATES
NITROGEN COMPOUNDS
ORES
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
RESIDUES
SCATTERING
SILICON COMPOUNDS
TRANSITION ELEMENT COMPOUNDS