Synthesis of aqueous ferrofluids of Zn_xFe_{3鈭?span style='font-style: italic'>x}O₄ nanoparticles by citric acid assisted hydrothermal-reduction route for magnetic hyperthermia applications

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• 作者：Behshid Behdadfar^a ; ^{bbehdadfar@ma.iut.ac.ir} ; Ahmad Kermanpur^a ; Hojjat Sadeghi-Aliabadi^b ; Maria del Puerto Morales^c ; Morteza Mozaffari^d
• 关键词：Hydrothermal-reduction route ; Citric acid ; Zn substituted magnetite nanoparticle ; Aqueous ferrofluid ; Magnetic hyperthermia ; Intrinsic loss power ; Environmental friendly method
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：2012
• 期刊代码：31_03048853
• 类别：ph
• 出版时间：July, 2012
• 卷：324
• 期：14
• 页码：2211-2217
• 文件大小：1339 K

摘要

Superparamagnetic and monodispersed aqueous ferrofluids of Zn substituted magnetite nanoparticles (Zn_xFe_3鈭?em>xO₄, x=0, 0.25, 0.3, 0.37 and 0.4) were synthesized via hydrothermal-reduction route in the presence of citric acid, which is a facile, low energy and environmental friendly method. The synthesized nanoparticles were characterized by X ray diffraction (XRD) analysis, Fourier transform infrared (FTIR) spectroscopy, scanning and transmission electron microscopy (SEM and TEM) and the dynamic light scattering (DLS) method. The results showed that a certain amount of citric acid was required to obtain single phase Zn substituted magnetite nanoparticles. Citric acid acted as a modulator and reducing agent in the formation of spinel structure and controlled nanoparticle size and crystallinity. Mean particle sizes of the prepared nanoparticles were around 10 nm. The results that are obtained from XRD, magnetic and power loss measurements showed that the crystallinity, saturation magnetization (M_S) and loss power of the synthesized ferrofluids were all influenced by the substitution of Zn in the structure of magnetite. The Zn substituted magnetite nanoparticles obtained by this route showed a good stability in aqueous medium (pH 7) and hydrodynamic sizes below 100 nm and polydispersity indexes below 0.2. The calculated intrinsic loss power (ILP) for the sample x=0.3 (e.g. 2.36 nH m²/kg) was comparable to ILP of commercial ferrofluids with similar hydrodynamic sizes.