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Reversible post-syn...
Reversible post-synthesis tuning of the superparamagnetic blocking temperature of gamma-Fe2O3 nanoparticles by adsorption and desorption of Co(II) ions
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Salazar-Alvarez, German (author)
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Sort, Jordi (author)
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Uheida, Abdusalam (author)
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- Muhammed, Mamoun (author)
- KTH,Materialvetenskap
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Surinach, Santiago (author)
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Dolors Baro, Maria (author)
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Nogues, Josep (author)
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(creator_code:org_t)
- 2007
- 2007
- English.
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In: Journal of Materials Chemistry. - : Royal Society of Chemistry (RSC). - 0959-9428 .- 1364-5501. ; 17:4, s. 322-328
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- The influence of the post-synthesis adsorption of Co(II) ions on the structural and magnetic properties of maghemite (gamma-Fe2O3) nanoparticles with a mean particle size of about 10 nm has been investigated. It is shown that the step-wise adsorption of Co( II) can controllably increase the blocking temperature, T-B, of the system up to 60 K with respect to that of untreated particles, while neither the particle size nor the particle size distribution are significantly modified. This is accompanied by a four-fold increase in the coercivity, H-C, at low temperatures. Using a selective leaching of the previously adsorbed Co(II) ions the T-B and H-C values of the pristine gamma-Fe2O3 nanoparticles are recovered. Hence, a reversible and controllable tailoring of the magnetic properties (e.g., T-B and H-C) of the gamma-Fe2O3 nanoparticles can be achieved by a simple adsorption and desorption process of Co( II) ions after their synthesis.
Keyword
- iron-oxide
- magnetic-properties
- electron-transfer
- particles
- ferrite
- fe2o3
- co2
Publication and Content Type
- ref (subject category)
- art (subject category)
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