Abstract
Magnetite nanoparticles were synthesized by two methods: reverse coprecipitation and partial oxidation of ferrous ions. The particles were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, vibrating sample magnetometry (VSM), and thermogravimetric analysis (TGA). The prepared nanoparticles exhibited superparamagnetic properties at room temperature. The mean size of the particles was in the range of 10-29 nm. TGA curves showed different thermal decomposition behaviors depending on the synthesis method. Distinct magnetic responsiveness was observed for the TGA residue samples. Thermal decomposition kinetics was evaluated by the model-based approach using TGA curves measured at three distinct heating rates in the temperature range of 298-1173 K under a synthetic air atmosphere. The model fit resulted in a correlation coefficient of 0.998 and the order of magnitude for the estimated kinetic parameters agreed with the reported data in the literature.
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Abbreviations
- A :
-
Pre-exponential factor, \(\mathrm {s^{-1}}\)
- B :
-
Half-maximum height of diffraction peak, Radians
- D :
-
Crystallite size, nm
- E :
-
Activation energy, J \(\mathrm {mol^{-1}}\)
- F :
-
Shape factor in Scherrer equation
- m :
-
Sample mass (mg)
- R :
-
Ideal gas constant, J \(\mathrm {mol^{-1} K^{-1}}\)
- T :
-
Temperature, K
- w :
-
Mass loss ratio, \(\%\)
- \(\alpha \) :
-
Degree of conversion
- \(\beta \) :
-
Heating rate, K \(\mathrm {min^{-1}}\)
- \(\theta \) :
-
Braggs angle, Radians
- \(\lambda \) :
-
X-ray radiation wavelength, nm
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The authors thank the research funding agencies CAPES and CNPq for their financial support. In addition, the authors thank the analytical center of the institute of chemistry (UFRN) for the infrastructure provided during the development of the work.
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Silva, M.G.d., Santiago, L.E.P., Fernandes, R.d.S. et al. Analysis of thermal decomposition of magnetic nanoparticles synthesized by reverse coprecipitation and partial oxidation of ferrous ions. Braz. J. Chem. Eng. 41, 347–357 (2024). https://doi.org/10.1007/s43153-023-00336-9
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DOI: https://doi.org/10.1007/s43153-023-00336-9