NDLI: Hyperthermia studies of ferrite nanoparticles synthesized in the presence of cotton

Content Provider	Royal Society of Chemistry (RSC)
Author	Mendonça, Maria Helena Mendo, Sofia G. Cruz, Maria Margarida Alves, André F. Ferreira, Liliana P. Godinho, Margarida Carvalho, Maria Deus
Copyright Year	2015
Abstract	MFe2O4 (M = Co, Fe, Mn) compounds were synthesized using hydrothermal treatment in the presence of medicinal cotton. Two sets of nanoparticles were produced for each composition and subsequently characterized by XRD, TEM and SEM. The nanoparticles obtained from the solution display the expected spinel structure and different mean sizes (below 16 nm); the nanoparticles embedded in cotton were subjected to a calcination process for cotton elimination. Regarding these calcinated samples, the spinel structure was maintained for CoFe2O4, a mixture of phases was identified for the M = Mn sample and, in the case of iron, the magnetite phase was converted to hematite (α-Fe2O3). After cotton elimination the samples exhibit a morphology which evidences the role of cotton as a template. To evaluate the quality of the nanoparticles for hyperthermia, SQUID magnetometry and Mössbauer spectroscopy were used to perform the magnetic characterization of all products, and the specific loss power (SLP) was determined by induction heating measurements. All the ferrite NP obtained by hydrothermal synthesis in the presence of cotton display good hyperthermia performance. MnFe2O4 nanoparticles exhibit the highest SLP value, 90 W g−1, followed by Fe3−xO4, and CoFe2O4. In the case of CoFe2O4, the specific loss power of the NP obtained after cotton elimination is enhanced by 50% which is explained by the NP morphology adopted from the cotton template during the synthesis.
Starting Page	7182
Ending Page	7193
Page Count	12
File Format	HTM / HTML PDF
ISSN	11440546
Volume Number	39
Issue Number	9
Journal	New Journal of Chemistry
DOI	10.1039/c5nj00009b
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Hematite NP SQUID Calcination Magnetometer Cotton Electric power transmission Induction heating X-ray crystallography Ferrite core Hydrothermal synthesis Transmission electron microscopy Magnetite Spinel Mössbauer spectroscopy Hyperthermia
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry Catalysis

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