Iron oxide silica derived from sol-gel synthesis
Open accessAbstract
In this work we investigate the effect of iron oxide embedded in silica matrices as a function of Fe/Si molar ratio and sol pH. To achieve homogeneous dispersion of iron oxide particles, iron nitrate nonahydrate was dissolved in hydrogen peroxide and was mixed with tetraethyl orthosilicate and ethanol in a sol-gel synthesis method. Increasing the calcination temperature led to a reduction in surface area, although the average pore radius remained almost constant at about 10 Å, independent of the Fe/Si molar ratio or sol pH. Hence, the densification of the matrix was accompanied by similar reduction in pore volume. However, calcination at 700 °C resulted in samples with similar surface area though the iron oxide content increased from 5% to 50% Fe/Si molar ratio. As metal oxide particles have lower surface area than polymeric silica structures, these results strongly suggest that the iron oxides opposed the silica structure collapse. The effect of sol pH was found to be less significant than the Fe/Si molar ratio in the formation of molecular sieve structures derived from iron oxide silica.
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The thickness of the silica shell in sol-gel synthesis is typically tuned by controlling the amount of TEOS and ammonia.
“The thickness of the silica shell is typically tuned by controlling the amount of TEOS and ammonia [43–45].”
From Iron oxide nanoparticles: Diagnostic, therapeutic and theranostic applications (2019) · cites this paper as [43]
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Research works printed but not linked: 2
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Iron oxide nanoparticles: Diagnostic, therapeutic and theranostic applications
Dadfar, S. M., Roemhild, K., Drude, N. I., von Stillfried, S., Knüchel, R., Kiessling, F., & Lammers, T. (2019) · Advanced Drug Delivery Reviews · doi:10.1016/j.addr.2019.01.005 · Cited by 1,181 · see citing works
- Authors
- Darmawan, A., Smart, S., Julbe, A., & Diniz da Costa, J. C.
- Affiliations
- The University of Queensland (AU)
- Institut Européen des Membranes (FR)
- FIMLab—Films and Inorganic Membrane Laboratory, School of Chemical Engineering, The University of Queensland, Brisbane Qld 4072, Australia
- Venue
- Materials
- Publisher
- MDPI AG
- Published
- 2011-02-17
- Volume
- 4
- Issue
- 2
- Pages
- 448-456
- ISSN
- 1996-1944 (ISSN-L)
- PMC
- PMC5448492
- OpenAlex
- W2171851659
- Cited by
- 42
- References
- 22
- Citations by year
- 2026: 1 · 2025: 1 · 2024: 3 · 2023: 6 · 2022: 1 · 2021: 3 · 2019: 6 · 2018: 2 · 2017: 3 · 2016: 5 · 2015: 4 · 2014: 3 · 2013: 1 · 2012: 2
- FWCI
- 1.10
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- Materials (publishedVersion, cc-by)
- Europe PMC (PubMed Central) (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Funders
- Australian Research Council
- Topics
- Physical Sciences › Materials Science › Materials Chemistry › Mesoporous Materials and Catalysis
- Physical Sciences › Chemistry › Spectroscopy › Aerogels and thermal insulation
- Physical Sciences › Chemistry › Inorganic Chemistry › Zeolite Catalysis and Synthesis
- Keywords
- iron oxide, silica, sol-gel synthesis, calcination temperature, surface area, pore size, molecular sieves, iron nitrate, tetraethoxysilane, hydrogen peroxide
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