Abstract
Nano-Fe3O4 particles were prepared by a two-step microemulsion method, the influence of molar ratio of water to NP-5 (R), alkali concentration and temperature on dispersibility and shape of the nanoparticles were discussed. Magnetic studies were also carried out using VSM in this paper. It was found that the optimum preparation parameters are R = 6.0, alkali concentration = 2.5 mol.L–1, initial total iron concentration as 0.88 mol.L–1, and the temperature being 30°C, the prepared nano magnetite particles have uniform size and good dispersibility with a crystal structure belonging to cubicFe3O4 and lattice parameters of a = 8.273 A. The results of magnetic studies show, magnetic properties of particles are influenced by dispersibility of nanoparticles which depends on size of clusters. The better dispersibility of nanoparticles leads to more ordered inner magnetic vector, and so the stronger magnetic behavior of nano-Fe3O4 particles.
Highlights
Magnetic nanoparticles have been widely studied because of their fascinating properties and wide range of potential applications in ferrofluids, information storage, pigment, medicine, biomedical and bioengineering, etc. [1,2,3] The nano magnetite particles can be synthesized by precipitation from the solution of mixed Fe(II)/Fe(III) salts in alkaline medium
It was found that the optimum preparation parameters are R = 6.0, alkali concentration = 2.5 mol·L–1, initial total iron concentration as 0.88 mol·L–1, and the temperature being 30 ̊C, the prepared nano magnetite particles have uniform size and good dispersibility with a crystal structure belonging to cubic Fe3O4 and lattice parameters of a = 8.273 Å
The cubic nano-Fe3O4 particles have been successfully synthesized by using two-step microemulsion method
Summary
Magnetic nanoparticles have been widely studied because of their fascinating properties and wide range of potential applications in ferrofluids, information storage, pigment, medicine, biomedical and bioengineering, etc. [1,2,3] The nano magnetite particles can be synthesized by precipitation from the solution of mixed Fe(II)/Fe(III) salts in alkaline medium. [1,2,3] The nano magnetite particles can be synthesized by precipitation from the solution of mixed Fe(II)/Fe(III) salts in alkaline medium. Many applications depend on their size and stoichiometry of particles, the dispersibility and shape of prepared particles varies with the hydrolysis condition, the additive surfactant[4] and organic compound [5], most of them exhibit nano spherical particles [16,17,18]. Many reports have not systematically studied various factors affecting dispersibility and shape of nano-Fe3O4 particles, especially the relationship between dispersibility and their magnetic behavior. The different factors affecting dispersibility of nano-Fe3O4 particles, including NaOH concentration, reaction temperature, water-surfactant ratio, and initial total iron concentration, are discussed. The relationship between the magnetic properties and dispersion behavior of nano-Fe3O4 particles is studied
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