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  4. Hydrothermal growth of iron oxide NPs with a uniform size distribution for magnetically induced hyperthermia: Structural, colloidal and magnetic properties
 
research article

Hydrothermal growth of iron oxide NPs with a uniform size distribution for magnetically induced hyperthermia: Structural, colloidal and magnetic properties

Gyergyek, Sao
•
Makovec, Darko
•
Jagodic, Marko
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2017
Journal Of Alloys And Compounds

Magnetic iron oxide nanoparticles with a narrow size distribution were synthesized by hydrothermally treating suspensions of iron oxide nanoparticles. Ricinoleic-acid-coated magnetic nanoparticles were co precipitated at room temperature from an aqueous solution of Fe2+/Fe3+ cations by the addition of a base. The presence of the ricinoleic acid on the nanoparticles' surfaces strongly suppressed their growth under the hydrothermal conditions. Because of the strong dependency of the rate of particle growth on their size, the size distribution significantly narrowed during the hydrothermal treatment. The size of the nanoparticles was successfully controlled by the temperature of the synthesis and the amount of ricinoleic acid present in the reaction mixture to between 9 and 30 nm. The presence of the ricinoleic acid on nanoparticles' surfaces enabled the preparation of colloidal suspensions in even moderately polar organic liquids. Measurements of the magnetic properties revealed that the nanoparticles smaller than 14 nm exhibited superparamagnetic behavior and nanoparticles larger than 15 nm displayed single domain ferrimagnetic behavior. The nanoparticles exhibited large values of saturation magnetization of up to 90 emu/g. The strong dependence of the nanoparticles' specific power losses when subjected to an alternating magnetic field on their average size and frequency was demonstrated. The ferrimagnetic nanoparticles showed much higher power losses than the superparamagnetic nanoparticles. (C) 2016 Elsevier B.V. All rights reserved.

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Type
research article
DOI
10.1016/j.jallcom.2016.09.238
Web of Science ID

WOS:000390622900037

Author(s)
Gyergyek, Sao
•
Makovec, Darko
•
Jagodic, Marko
•
Drofenik, Mihael
•
Schenk, Kurt
•
Jordan, Olivier
•
Kovac, Janez
•
Drazic, Goran
•
Hofmann, Heinrich  
Date Issued

2017

Publisher

Elsevier

Published in
Journal Of Alloys And Compounds
Volume

694

Start page

261

End page

271

Subjects

Hydrothermal synthesis

•

Iron oxide

•

Nanoparticles

•

Nanocrystals

•

Magnetic hyperthermia

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LTP  
Available on Infoscience
January 24, 2017
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/133453
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