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Magnetic polyorganosiloxane core-shell nanoparticles: Synthesis, characterization and magnetic fractionation

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Zitation

Utech, S., Scherer, C., Krohne, K., Carrella, L., Rentschler, E., Gasi, T., et al. (2010). Magnetic polyorganosiloxane core-shell nanoparticles: Synthesis, characterization and magnetic fractionation. Journal of Magnetism and Magnetic Materials, 322(21), 3519-3526. doi:10.1016/j.jmmm.2010.06.056.


Zitierlink: https://hdl.handle.net/11858/00-001M-0000-0018-A4F2-0
Zusammenfassung
Here, we present the synthesis, characterization and magnetic separation of magnetic polyorganosiloxane nanoparticles. Magnetic iron oxide nanoparticles with average particle radii of 3.2 nm had been synthesized by a simple coprecipitation process of iron(II) and iron(III) salt in basic solution. Afterwards, the particles were successfully incorporated into a polyorganosiloxane network via a polycondensation reaction of trimethoxymethylsilane (T), diethoxydimethylsilane (D) and the functional monomer (chloromethylphenyl)trimethoxysilane (ClBz-T) in aqueous dispersion. A coreshell system was chosen to increase the flexibility of the system concerning size, composition and functionalization possibilities. The magnetic nanocapsules with particle radii below 60 nm were separated from non-magnetic material with a high effectiveness by the use of commercially available separation columns which are commonly used for isolation of microbeads and subsequently characterized via transmission electron microscopy (TEM), asymmetrical flow field-flow fractionation (AF-FFF), superconducting quantum interference device (SQUID) and Mossbauer spectroscopy. (C) 2010 Elsevier B.V. All rights reserved.