Abstract
Composite microspheres of polystyrene or silica coated with a double layer of Fe3O4/SiO2 were prepared via mechanical routes using a shear-compressing type machine. The binding energy of Fe2p3/2 measured by XPS increased, while that of Si2p decreased after composite formation. These synchronized shifts increased with increasing intensity of mechnical treatment. After heat treatment, chemical interaction at the interlayer Fe3O4/SiO2 interface in a composite particle during mechanical treatment was verified. The fine structure of the interlayer boundary was also examined in detail by electron microscopy.
