Oriented Assembly of Fe₃O₄ Nanoparticles into Monodisperse Hollow Single-Crystal Microspheres

Abstract

Magnetite nanoparticles of Fe3O4 were found to assemble into monodisperse hollow Fe3O4 microspheres with tunable diameters ranging from 200 to 400 nm and open pores on the shells in ethylene glycol in the presence of dodecylamine (DDA). The oriented assembly of nanoparticles conferred the individual hollow Fe3O4 microspheres a remarkable feature of single crystals. The morphologies of the products could be easily manipulated by varying the synthesis parameters. Increasing the concentration of DDA led to an obvious shape evolution of the products from rhombic nanoparticles to hollow microspheres, solid microspheres, and finally irregular nanoparticles, which were mainly attributed to the special self-assembly phenomenon of Fe3O4 nanoparticles in the solvothermal process.

Polyhedral Magnetite Nanocrystals with Multiple Facets: Facile Synthesis, Structural Modelling, Magnetic Properties and Application for High Capacity Lithium Storage

“…The shape of our hysteresis loops and the value of the saturation moment are comparable to other Fe 3 O 4 nanoparticles. [58,59] The shape of the hysteresis loops is characteristic for samples consisting of superspins, which confirms our arguments based on temperature dependence of the magnetic moment. ly.…”

Hollow Micro‐/Nanostructures: Synthesis and Applications

“…Recently, Lu and co-workers reported a vesicle-liquid-crystal dual templating method for producing hollow spheres of periodic mesoporous organosilica (PMO) with tunable wall thickness. [201] Micelles or vesicles have also been utilized as soft templates to synthesize hollow spheres of other materials, such as carbon, [206] metal oxides, [207][208][209][210][211][212] as well as some metals. [213][214][215][216] Xu et al have recently prepared novel multishelled Cu 2 O hollow spheres with single-crystalline shell structure via a simple CTAB vesicle templating route in aqueous solution (see Fig.…”

Solvothermal Synthesis and Magnetic Property of Magnetic Chains Self‐assembled by Fe3O4 Microoctahedrons

“…[1][2][3][4][5][6] Various approaches have been reported for fabricating Fe 3 O 4 micro/nanocrystals with varied morphologies, for example, hollow spheres, nanorods, nanowires, nanopyramids, nanoplates, etc. [7][8][9][10][11][12][13][14][15] Although Fe 3 O 4 has been synthesized by various methods, the products were overwhelmingly dominated by particles with size of nanometer. With the development of the modern science, it is a great challenge to develop approaches to synthesize magnetic particles with suitable size, which helps to meet special need of biomedical fields.…”