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

Abstract

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.

Authors:
; ;  [1]
  1. Faculty of Applied Sciences, Universiti Teknologi MARA (UiTM), 40450 Shah Alam, Selangor (Malaysia)
Publication Date:
OSTI Identifier:
21371681
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 1217; Journal 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; Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
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

Citation Formats

Maamur, K N, Jais, U S, and Yahya, S Y. S. Magnetic Phase Development of Iron Oxide-SiO{sub 2} Aerogel and Xerogel Prepared using Rice Husk Ash as Precursor. United States: N. p., 2010. Web. doi:10.1063/1.3377832.
Maamur, K N, Jais, U S, & Yahya, S Y. S. Magnetic Phase Development of Iron Oxide-SiO{sub 2} Aerogel and Xerogel Prepared using Rice Husk Ash as Precursor. United States. https://doi.org/10.1063/1.3377832
Maamur, K N, Jais, U S, and Yahya, S Y. S. 2010. "Magnetic Phase Development of Iron Oxide-SiO{sub 2} Aerogel and Xerogel Prepared using Rice Husk Ash as Precursor". United States. https://doi.org/10.1063/1.3377832.
@article{osti_21371681,
title = {Magnetic Phase Development of Iron Oxide-SiO{sub 2} Aerogel and Xerogel Prepared using Rice Husk Ash as Precursor},
author = {Maamur, K N and Jais, U S and Yahya, S Y. S.},
abstractNote = {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.},
doi = {10.1063/1.3377832},
url = {https://www.osti.gov/biblio/21371681}, journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 1217,
place = {United States},
year = {Thu Mar 11 00:00:00 EST 2010},
month = {Thu Mar 11 00:00:00 EST 2010}
}