Tunable-Size Magnetite Nanoparticles in Aqueous Polyol Media
Although the coprecipitation method is the simplest way to prepare iron oxide nanoparticles of magnetite, however, controlling reliably the particle size distribution of magnetite remains a challenge. In this work, a straightforward procedure is used for controlled synthesis of uniform magnetite nanospheres in a water-glycol binary solvent system by coprecipitation method. The media viscosity is investigated as a tool of tuning the size of magnetic nanoparticles at temperatures ranging from 25 to 80 $^{\circ}$C, and at different glycol concentrations (25- 50 mol.\%). The magnetite nanospheres, which are composed of nanosized subunits, are nearly of monodispersed sizes/diameters that are tunable in the range of 6–155 nm by varying the volume ratio glycol/water. In this process, the glycols are considered as a co-solvent on the structures, functional groups, and magnetic properties of magnetite nanoparticles. The presence of a co-solvent in the solution affects the agglomeration, because of changes in the activity coefficients and the solubility of the salt. The DLS and TEM characterizations show that the growth of nanoparticles is gradually decreased with increasing the value of viscosity index of the reaction medium. Consequently, the mechanistic growth, assembly, and aggregation phenomena of magnetic nanoparticles strongly rely on the viscosity of solvent molecules. Using the optimized methodology, we found that the wide size range of magnetic nanoparticles with different morphology sizes can be synthesized by simply modulating the volume percentage of glycol solvent in the reaction medium, avoiding agglomeration of the magnetite nuclei together to form larger spheres due to the higher viscosity, for instance in the presence of triethylene glycol
Year of publication: |
[2022]
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Authors: | Mahmoudi, Hajar ; Jafari, Abbas Ali ; Faghihi, Mohammad Javad ; El Kharbachi, Abdel ; Baghshahi, Hamid Reza |
Publisher: |
[S.l.] : SSRN |
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