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Synthesis of High Intrinsic Loss Power Aqueous Ferrofluids of Iron Oxide Nanoparticles by Citric Acid-Assisted Hydrothermal-Reduction Route Publisher



Behdadfar B1 ; Kermanpur A1 ; Sadeghialiabadi H2 ; Morales MDP3 ; Mozaffari M4
Authors
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Authors Affiliations
  1. 1. Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran
  2. 2. School of Pharmacy, Isfahan Pharmaceutical Research Center, Isfahan University of Medical Sciences, Isfahan, Iran
  3. 3. Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco 28049, Madrid, Spain
  4. 4. Department of Physics, Razi University, Kermanshah, Iran

Source: Journal of Solid State Chemistry Published:2012


Abstract

Monodispersed aqueous ferrofluids of iron oxide nanoparticle were synthesized by hydrothermal-reduction route. They were characterized by X-ray diffraction analysis, Fourier transform infrared spectroscopy, scanning and transmission electron microscopy and dynamic light scattering. The results showed that certain concentrations of citric acid (CA) are required to obtain only magnetic iron oxides with mean particle sizes around 8 nm. CA acts as a modulator and reducing agent in iron oxide formation which controls nanoparticle size. The XRD, magnetic and heating measurements showed that the temperature and time of hydrothermal reaction can affect the magnetic properties of obtained ferrofluids. The synthesized ferrofluids were stable at pH 7. Their mean hydrodynamic size was around 80 nm with polydispersity index (PDI) of 0.158. The calculated intrinsic loss power (ILP) was 9.4 nHm 2/kg. So this clean and cheap route is an efficient way to synthesize high ILP aqueous ferrofluids applicable in magnetic hyperthermia. © 2012 Elsevier Inc. All rights reserved.
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