Abstract
Superparamagnetic iron oxide particles with average size less than 20 nm were prepared by chemical co-precipitation method in the air atmosphere. After that, polydimethyldiallyl ammonium chloride (PDDA) was used for wrapping iron oxide particles to obtain the core/shell nanocomposites. The parameters influencing properties of iron oxide particles and iron oxide/PDDA nanocomposites were investigated and optimized. The prepared iron oxide and nanocomposites were characterized by X-ray diffraction (XRD) measurement, transmission electron microscopy (TEM), particle size and Zeta potential analyzer, Fourier transform infrared (FTIR) spectroscopy, and vibrating sample magnetometry (VSM), respectively. It was found that the iron oxide particles are cubic inverse spinel Fe3O4 with spherical shape. Superparamagnetic behavior of Fe3O4 with 73.114 emu/g is produced with NH4OH as precipitator, and decreased to 58.583 emu/g for Fe3O4/PDDA nanocomposites. The Zeta potential of nanocomposites is positive value. The results showed that Fe3O4/PDDA nanocomposites have excellent future using as a carrier for bonding with some negative charged particles. Copyright © 2016 John Wiley & Sons, Ltd.
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