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Hydrothermal Synthesis of Fine Stabilized Superparamagnetic Nanoparticles of Zn2+ Substituted Manganese Ferrite Publisher



Zahraei M1 ; Monshi A1 ; Morales MDP2 ; Shahbazigahrouei D3 ; Amirnasr M4 ; Behdadfar B1
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Authors Affiliations
  1. 1. Department of Materials Engineering, Isfahan University of Technology, Isfahan, 84156-83111, Iran
  2. 2. Instituto de Ciencia de Materiales de Madrid, ICMM, CSIC, Cantoblanco, 28049, Madrid, Spain
  3. 3. Department of Medical Physics, School of Medicine, Isfahan University of Medical Sciences, Isfahan, 81746-734615, Iran
  4. 4. Department of Chemistry, Isfahan University of Technology, Isfahan, 84156-83111, Iran

Source: Journal of Magnetism and Magnetic Materials Published:2015


Abstract

Superparamagnetic Zn2+ substituted manganese ferrite Mn1-xZnxFe2O4 (x=0.3, 0.35, 0.4 and 0.45) nanoparticles (NPs) were synthesized via a direct, efficient and environmental friendly hydrothermal method. The synthesized NPs were characterized by X-ray powder diffractometry (XRD), transmission electron microscopy (TEM), thermo-gravimetry (TG) and vibrating sample magnetometry (VSM). The effects of various parameters such as the pH of reaction mixture, time and temperature of hydrothermal treatment and Zn substitution on the spinel phase formation, the magnetization, and the size of resulting NPs are discussed. The Zn2+ substituted manganese ferrite NPs obtained from hydrothermal process crystallized mainly in the spinel phase. Nevertheless, without citrate ions, the hematite phase appeared in the product. The monophase Zn2+ substituted manganese ferrite NPs hydrothermally prepared in the presence of citric acid had mean particle size of 7 nm and a narrow size distribution. Furthermore, the synthesized NPs can be used to prepare ferrofluids for biomedical applications due to their small size, good stability in aqueous medium (pH 7) and also high magnetization value. © 2015 Elsevier B.V. All rights reserved.
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