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Silica/Ormosil SPIONs for Biomedical Applications

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In the present work, magnetic nanoparticles coated with silica or ORMOSIL are prepared in a two step process. In the first step, SPIONs with 6 nm average diameter are produced by a reduction-precipitation process conducted in air and in the second one, SPIONs were used as seeds for silica/ORMOSIL growth (below 30 nm), in situ by a modified Stober sol-gel method. SPIONs and silica/ ORMOSIL magnetic core-shell nanostructures were characterized by X-Ray diffraction (XRD), Fourier transformed infrared (FTIR) spectroscopy, transmission electron microscopy (TEM), Mossbauer spectroscopy and SQUID magnetometry. TEM observations of SPIONs and silica/ORMOSIL SPIONs allow determining size and shape. FTIR allows determining silica/ORMOSIL structural fingerprints. X-ray and Mossbauer spectroscopy allow determining the magnetite/maghemite ratio, discussed as a nanosized constrained. SPIONs and silica/ORMOSIL SPIONs show superparamagnetic properties making them appropriated to biomedical applications.
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Keywords: SPIONs; Superparamagnetic iron oxide nanoparticles; core-shell nanostructures; silica/ORMOSIL coating; sol-gel

Document Type: Research Article

Publication date: October 1, 2013

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  • Current Nanoscience publishes authoritative reviews and original research reports, written by experts in the field on all the most recent advances in nanoscience and nanotechnology. All aspects of the field are represented including nano- structures, synthesis, properties, assembly and devices. Applications of nanoscience in biotechnology, medicine, pharmaceuticals, physics, material science and electronics are also covered. The journal is essential to all involved in nanoscience and its applied areas.
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