NDLI: Thermophysical and Magnetic Properties of Carbon Beads Containing Cobalt Nanocrystallites

Content Provider	Springer Nature Link
Author	Izydorzak, M. Skumiel, A. Leowicz, M. Kaczmarek Kliwska, M. Pomogailo, A. D. Dzhardimalieva, G. I.
Copyright Year	2011
Abstract	Magnetic Co-beads were fabricated in the course of a three-step procedure comprising preparation of a metal–acrylamide complex, followed by frontal polymerization and finally pyrolysis of the polymer. The composites obtained were composed of cobalt nanocrystallites stabilized in a carbon matrix built of disordered graphite. The crystallite size, material morphology, fraction of the magnetic component, and thus the magnetic properties can be tailored by a proper choice of the processing variables. The samples were subjected to an alternating magnetic field of different strengths (H = 0 to 5 kA · m$^{−1}$) at a frequency of f = 500 kHz. From the calorimetric measurements, we concluded that the relaxation processes dominate in the heat generation mechanism for the beads pyrolyzed at 773 K. For the beads pyrolyzed at 1073 K, significant values of magnetic properties, such as the coercive force and remanence give substantial contribution to the energy losses for hysteresis. The specific absorption coefficient (SAR) related to the cobalt mass unit for the 1073 K pyrolyzed beads $${({\it SAR} = 1340 \, \, {\rm W} \cdot {\rm g}^{-1 }_{\rm cobalt})}$$ is in very good conformity with the results obtained by other authors. The effective density power loss, caused by eddy currents, can be neglected for heating processes applied in magnetic hyperthermia. The Co-beads can potentially be applied for hyperthermia treatment.
Starting Page	627
Ending Page	639
Page Count	13
File Format	PDF
ISSN	0195928X
Journal	International Journal of Thermophysics
Volume Number	33
Issue Number	4
e-ISSN	15729567
Language	English
Publisher	Springer US
Publisher Date	2011-10-26
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Carbon nanocomposites Hyperthermia Magnetic beads Physical Chemistry Industrial Chemistry/Chemical Engineering Condensed Matter Physics Mechanics
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics

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