Abstract
Nanometer ferriferrous oxide (Fe3O4) with about 10–30 nm diameter were deposited on the inner and outer surfaces of natural halloysite nanotubes (HNTs) via the reduction co-precipitation process. The aggregation of Fe3O4 nanoparticles will be significantly reduced as they are distributed on the surfaces of HNTs with higher specific surface areas. Powder X-ray diffraction (XRD) and Fourier transform infrared (FT-IR) spectrometer showed that Fe3O4/HTNs composites had a good thermal stability at 373 K and 523 K. Furthermore, Vibrating-sample magnetometer (VSM) confirmed the superparamagnetism of Fe3O4/HTNs composites could be preserved at different heat treatment of 373 K and 523 K.
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