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Superparamagnetic FeCo and FeNi nanocomposites dispersed in submicrometer-ized C spheres

Magnetic spheres with average diameter 100 nm, consisting of FeCo and FeNi nanomagnets (with average diameters 5.9 ± 1 and 4.6 ± 0.3 nm, respectively) dispersed in spherical carbon colloid have been synthesized using the radio frequency plasma-enhanced chemical vapor deposition technique. The nanopa...

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Bibliographic Details
Main Authors: Ibrahim, Emad Monier Mosaad (Author) , Kath, Matthias (Author) , Gendy, Ahmed A. el (Author) , Klingeler, Rüdiger (Author)
Format: Article (Journal)
Language:English
Published: 25 October 2012
In: The journal of physical chemistry. C, Energy, materials, and catalysis
Year: 2012, Volume: 116, Issue: 42, Pages: 22509-22517
ISSN:1932-7455
DOI:10.1021/jp304236x
Online Access:Verlag, Volltext: http://dx.doi.org/10.1021/jp304236x
Verlag, Volltext: https://doi.org/10.1021/jp304236x
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Author Notes:E.M.M. Ibrahim, Silke Hampel, A.U.B. Wolter, M. Kath, A.A. El-Gendy, R. Klingeler, Christine Täschner, Vyacheslav O. Khavrus, Thomas Gemming, Albrecht Leonhardt, and Bernd Büchner
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Summary:Magnetic spheres with average diameter 100 nm, consisting of FeCo and FeNi nanomagnets (with average diameters 5.9 ± 1 and 4.6 ± 0.3 nm, respectively) dispersed in spherical carbon colloid have been synthesized using the radio frequency plasma-enhanced chemical vapor deposition technique. The nanoparticles are tightly embedded in the C matrix and well protected from oxidation. Superparamagnetic features such as typical Langevin-like magnetization curves are observed for the nanocomposites. A comprehensive analysis of the presence of dipolar interactions has been carried out within the framework of the mean-field model. The size of the nanoparticles constituting the carbon-spheres is near to the optimal value where Néel losses are maximal and considerable Neel-type specific absorption rates are observed. The material may hence provide a new material-based approach to realize biocompatibly protected superparamagnetic beads for application in biological environments, in particular, for magnetic hyperthermia.
Item Description:Gesehen am 19.11.2018
Physical Description:Online Resource
ISSN:1932-7455
DOI:10.1021/jp304236x

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