A Simple and Reliable Synthesis of Superparamagnetic Magnetite Nanoparticles by Thermal Decomposition of Fe(acac)₃

Abstract

Magnetic nanoparticles have been largely proposed as means of technological tools due to its value in different fields, especially in biomedicine. Herein, we present a robust, highly reproducible and low-cost method to obtain superparamagnetic magnetite nanoparticles (MNP-II) of about 15±5 nm diameter by thermal decomposition of [Fe(acac)3] in a one-pot, two-step method. In the first step, magnetite nanoparticles (MNP-I) of lower size, 9±4 nm, with a saturation magnetization (MS) of 65 emu/g and a coercive field (Hc) of 1 Oe are obtained. In the second step, those particles MNP-I act as seeds for the final MNP-II which present a saturation magnetization of 70 emu/g and a coercive field of 12 Oe.

A synthesis of polyethylene glycol (PEG)-coated magnetite Fe3O4 nanoparticles and their characteristics for enhancement of biosensor

“…This is due to the oxidation process that occurred in the synthesis process [17]. Then there is another phase on PEG-coated Fe 3 product. However, this peak was not observed in the Fe 3 O 4 spectrum.…”

“…In recent years, magnetic nanoparticles especially magnetite Fe 3 O 4 nanoparticles have been widely used in biomedical applications for collection and separation of bioactive molecules, targeted drug delivery, and biolabeling because of its characteristics, such as superparamagnetic, responses to biomolecules, biomoleculedispersions and high magnetic saturation (M s ) [1][2][3]. To be applied as a biosensor, magnetite Fe 3 O 4 nanoparticles must have good dispersibility in aqueous media and narrow size distribution.…”

“…In this study, PEG-coated Fe 3 O 4 was synthesized following a simple two steps co-precipitation approach with various PEG concentrations. The synthesized PEG-coated Fe 3 were investigated by x-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, transmission electron microscopy (TEM), and vibrating sample magnetometer (VSM).…”

Magnetic and Magneto-Optical Oroperties of Iron Oxides Nanoparticles Synthesized under Atmospheric Pressure

“…Many different methods for the synthesis of magnetite nanoparticles have been described in the literature, including co-precipitation [ 27 , 28 , 29 ], hydrothermal [ 30 , 31 , 32 ], sol-gel [ 33 , 34 , 35 ], thermal decomposition [ 36 , 37 , 38 , 39 , 40 ], among others [ 41 , 42 , 43 ]. Besides, the key role of the synthesis conditions, such as reaction temperature, reagents concentration, the effect of different additives, and others on the magnetic properties and size control have also been discussed in the literature.…”

Efficient synthesis of β‐aminoketones catalyzed by Fe3O4@ quillaja sapogenin/Ni (II) as a novel magnetic nano‐catalyst

“…Therefore, the saturation magnetization of nanoparticles is approximately 70.0 emu/g (Figure 6a) and is far less than its bulk counterparts (92.0 emu/g). [41][42][43][44] The nano-Fe 3 O 4 @Qs/Ni (II) magnetization was lower than 30.0 emu/g. .…”