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Abstract:
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.
