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Issue 9, 2010
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One-step synthesis of superparamagnetic monodisperse porous Fe3O4 hollow and core-shell spheres

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Abstract

Monodisperse hollow and core-shell magnetite (Fe3O4) spheres have been prepared by a simple one-pot method based on hydrothermal treatment of FeCl3, citrate, polyacrylamide and urea. The as-prepared samples have been characterized using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, nitrogen adsorption-desorption isotherms, superconducting quantum interference device magnetometer. The results of control experiments reveal that citrate and polyacrylamide are crucial for the formation of spherical product and the well known Ostwald ripening process is responsible for the transformation from solid spheres to hollow and core-shell spheres. The hollow and core-shell magnetite spheres are porous and highly water soluble. They exhibit superparamagnetic properties with relatively high saturation magnetization at room temperature. The superparamagnetic properties, high magnetization, high water solubility, together with the hollow interiors will render them ideal candidates for various biomedical applications.

Graphical abstract: One-step synthesis of superparamagnetic monodisperse porous Fe3O4 hollow and core-shell spheres

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Publication details

The article was received on 15 Sep 2009, accepted on 02 Dec 2009 and first published on 18 Jan 2010


Article type: Paper
DOI: 10.1039/B919164J
Citation: J. Mater. Chem., 2010,20, 1799-1805
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    One-step synthesis of superparamagnetic monodisperse porous Fe3O4 hollow and core-shell spheres

    W. Cheng, K. Tang, Y. Qi, J. Sheng and Z. Liu, J. Mater. Chem., 2010, 20, 1799
    DOI: 10.1039/B919164J

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