Issue 11, 2016

Self-assembly, structural order and mechanism of γ-Fe2O3@SiO2 ellipsoids induced by magnetic fields

Abstract

Monodispersed γ-Fe2O3@SiO2 ellipsoids are prepared by the three-step approach of hydrothermal synthesis, reduction–oxidation and SiO2 coating. The magnetic field induced self-assembly processes are designed and carried out in different conditions. Influences of magnetic field strength, solvent, temperature, concentration and substrate are carefully investigated and evaluated by SEM and reflective spectra. The optimal self-assembly conditions of γ-Fe2O3@SiO2 ellipsoid ordered structures are confirmed to be dispersed in ethanol at 0.06 mol L−1 followed by evaporation on a glass substrate in a magnetic field of strength 5000 Oe at 35 °C. Finally, an air–liquid interfacial mechanism is suggested to understand the self-assembly processes.

Graphical abstract: Self-assembly, structural order and mechanism of γ-Fe2O3@SiO2 ellipsoids induced by magnetic fields

Article information

Article type
Paper
Submitted
05 May 2016
Accepted
23 Sep 2016
First published
26 Sep 2016

New J. Chem., 2016,40, 9520-9525

Self-assembly, structural order and mechanism of γ-Fe2O3@SiO2 ellipsoids induced by magnetic fields

X. Zhang, Y. Niu, J. Zhao and Y. Li, New J. Chem., 2016, 40, 9520 DOI: 10.1039/C6NJ01415A

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