Effects of Process Variables on Properties of CoFe<sub>2</sub>O<sub>4</sub> Nanoparticles Prepared by Solvothermal Process
Controlling the morphology and magnetic properties of CoFe<sub>2</sub>O<sub>4</sub> nanoparticles is crucial for the synthesis of compatible materials for different applications. CoFe<sub>2</sub>O<sub>4</sub> nanoparticles were synthesized by a solvoth...
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| Autores principales: | , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/53989f4e2c0347c2acb24c2c739d88f5 |
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| Sumario: | Controlling the morphology and magnetic properties of CoFe<sub>2</sub>O<sub>4</sub> nanoparticles is crucial for the synthesis of compatible materials for different applications. CoFe<sub>2</sub>O<sub>4</sub> nanoparticles were synthesized by a solvothermal method using cobalt nitrate, iron nitrate as precursors, and oleic acid as a surfactant. The formation of CoFe<sub>2</sub>O<sub>4</sub> nanoparticles was systematically observed by adjusting synthesis process conditions including reaction temperature, reaction time, and oleic acid concentration. Nearly spherical, monodispersed CoFe<sub>2</sub>O<sub>4</sub> nanoparticles were formed by changing the reaction time and reaction temperature. The oleic acid-coated CoFe<sub>2</sub>O<sub>4</sub> nanoparticles inhibited the growth of particle size after 1 h and, therefore, the particle size of CoFe<sub>2</sub>O<sub>4</sub> nanoparticles did not change significantly as the reaction time increased. Both without and with low oleic acid concentration, the large-sized cubic CoFe<sub>2</sub>O<sub>4</sub> nanoparticles showing ferromagnetic behavior were synthesized, while the small-sized CoFe<sub>2</sub>O<sub>4</sub> nanoparticles with superparamagnetic properties were obtained for the oleic acid concentration higher than 0.1 M. This study will become a basis for further research in the future to prepare the high-functional CoFe<sub>2</sub>O<sub>4</sub> magnetic nanoparticles by a solvothermal process, which can be applied to bio-separation, biosensors, drug delivery, magnetic hyperthermia, etc. |
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