Solvothermal synthesis of magnetic Fe3O4 microparticles via self-assembly of Fe3O4 nanoparticles--颗粒学报PARTICUOLOGY

Zhang, W., Shen, F., & Hong, R. (2011). Solvothermal synthesis of magnetic Fe3O4 microparticles via self-assembly of Fe3O4 nanoparticles. Particuology, 9(2), 179-186. https://doi.org/10.1016/j.partic.2010.07.025

Solvothermal synthesis of magnetic Fe₃O₄ microparticles via self-assembly of Fe₃O₄ nanoparticles

Wei Zhang, Fenglei Shen, Ruoyu Hong^*

College of Chemistry, Chemical Engineering & Materials Science, and Key Laboratory of Organic Synthesis of Jiangsu Province, Soochow University, SIP, Suzhou 215123, China

10.1016/j.partic.2010.07.025

Volume 9, Issue 2, April 2011, Pages 179-186

Received 6 April 2010, Revised 27 June 2010, Accepted 7 July 2010, Available online 1 March 2011.

E-mail: rhong@suda.edu.cn

Highlights

Abstract

Ferromagnetic Fe₃O₄ nanoparticles were synthesized and then self-assembled into microparticles via a solvothermal method, using FeCl₃·6H₂O as the iron source, sodium oleate as the surfactant, and ethylene glycol as the reducing agent and solvent. The obtained Fe₃O₄ microparticles were characterized by X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy and vibrating sample magnetometer (VSM). The size and morphology of the particles were examined using transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The Fe₃O₄ microparticles of nearly monodisperse diameters, controllable in the range of 120–400 nm, consist of assemblies of Fe₃O₄ nanoparticles with a diameter of 22 nm. The effects of reaction time, amount of surfactant and NaAc on the products were discussed. Interestingly, by using the pre-synthesized Fe₃O₄ microparticles as the growth substrates, spherical and smooth-looking Fe₃O₄ microparticles with average diameter of 1 μm were obtained. A plausible formation process was discussed.

Graphical abstract

Keywords

Iron oxides; Magnetic microparticles; Oriented attachment; Solvothermal method

文章导读