Abstract
We present an eco-friendly solvothermal method for synthesis of superparamagnetic α-Fe2O3 and Fe3O4 nanoparticles without precipitation agent. The α-Fe2O3 nanoparticles were synthesized with Fe(NO3)3·9H2O as the iron source and absolute ethanol as the solvent at 200 °C. To synthesize Fe3O4 nanoparticles, ascorbic acid was added as the reductant and then the synthesis was performed at 180 (M3 sample) and 200 °C (M4 sample), while other synthesis conditions were fixed. In the case of α-Fe2O3 sample, non-uniform nanoparticles with nearly spherical shapes and rough surfaces were fabricated under solvothermal conditions. Redox reaction between absolute ethanol and NO3¯ from iron source provided a substantial concentration of OH¯ ions needed for the formation of Fe2+ and Fe3+ hydroxides. The average particle sizes of α-Fe2O3, M3, and M4 nanoparticles were obtained to be 18.6, 23.1, and 15.8 nm, respectively.
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The financial support of this study was provided by Sari Agricultural Sciences and Natural Resources University in the form of research project (Projected Number: 03–1398–04).
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Kazemi, S.Y., Biparva, P. & Pourfaraj, R. Self-synthesis of superparamagnetic α-Fe2O3 and Fe3O4 nanoparticles: an eco-friendly and economic process. J IRAN CHEM SOC 18, 3399–3406 (2021). https://doi.org/10.1007/s13738-021-02277-x
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DOI: https://doi.org/10.1007/s13738-021-02277-x