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

• Verfasst von: Ibrahim, Emad Monier Mosaad [VerfasserIn]
• Verfasst von: Kath, Matthias [VerfasserIn]
• Verfasst von: Gendy, Ahmed A. el [VerfasserIn]
• Verfasst von: Klingeler, Rüdiger [VerfasserIn]
• Titel: Superparamagnetic FeCo and FeNi nanocomposites dispersed in submicrometer-ized C spheres
• Verf.angabe: 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
• E-Jahr: 2012
• Jahr: 25 October 2012
• Umfang: 9 S.
• Fussnoten: Gesehen am 19.11.2018
• Titel Quelle: Enthalten in: The journal of physical chemistry <Washington, DC> / C
• Ort Quelle: Washington, DC : Soc., 2007
• Jahr Quelle: 2012
• Band/Heft Quelle: 116(2012), 42, Seite 22509-22517
• ISSN Quelle: 1932-7455
• DOI: doi:10.1021/jp304236x
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1583831436

Abstract

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.