Cited by 110Magnetic Properties and Synthesis of FerritesCharacterization and Applications of Magnetic NanoparticlesGeomagnetism and Paleomagnetism Studies

Microemulsion-assisted synthesis of tunable superparamagnetic composites

Tartaj, Pedro, Serna, Carlos J.·2002·Chemistry of Materials

Abstract

Tunable superparamagnetic materials have been obtained by the thermal annealing of iron oxide/silica composites synthesized using microemulsions with a high content of the iron oxide precursor. The crystallochemical characteristics of the powders obtained after controlled hydrolysis within the reverse micelle nanocavities and their thermal evolution up to the formation of the γ-Fe 2 O 3 crystalline phase were studied. The thermally annealed composites clearly exhibited superparamagnetic behavior with the value of the saturation magnetization easily tuned by changing the iron oxide content and the annealing temperature. Information on the influence of particle size and interparticle interactions on the magnetic properties of the composites was inferred from zero field and field cooling measurements and also from the decay of the reduced remanence with temperature. It was observed that the blocking temperature increased with content and particle size of γ-Fe 2 O 3 . We have also determined a strong dependence of the effective anisotropy with the particle size associated with the existence of surface anisotropy.

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Crossref · 10.1021/cm021214d

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  • Maintenance of micelle structure at high reaction temperature or thermal annealing of synthesized iron oxide are ways to increase the crystallinity of particles prepared by microemulsion.

    “Maintenance of micelle structure at high reaction temperature [41] or thermal annealing of synthesized iron oxide [42] are ways to increase the crystallinity of the particles prepared by this method.”

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Authors
Tartaj, P., & Serna, C. J.
Affiliations
Consejo Superior de Investigaciones Científicas (ES)
Corresponding author
Tartaj, Pedro
Venue
Chemistry of Materials
Published
2002-09-19
Volume
14
Issue
10
Pages
4396-4402
ISSN
  • 0897-4756 (ISSN-L)
  • 1520-5002
OpenAlex
W2061192039
Cited by
110
References
30
Citations by year
2026: 1 · 2025: 4 · 2024: 1 · 2023: 3 · 2022: 2 · 2021: 8 · 2019: 5 · 2018: 1 · 2017: 3 · 2016: 3 · 2015: 5 · 2014: 6 · 2013: 4 · 2012: 6
FWCI
3.74
Type
journal article
Language
en
Open access
closed
Locations
Chemistry of Materials (publishedVersion)
Topics
  • Physical Sciences › Materials Science › Materials Chemistry › Magnetic Properties and Synthesis of Ferrites
  • Physical Sciences › Engineering › Biomedical Engineering › Characterization and Applications of Magnetic Nanoparticles
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Geomagnetism and Paleomagnetism Studies
Keywords
superparamagnetism, microemulsion synthesis, reverse micelles, annealing, maghemite, saturation magnetization, blocking temperature, magnetic anisotropy, surface anisotropy, particle size effects, interparticle interactions, field cooling

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