An XPS Study on the Interaction at the Fe₃O₄/SiO₂ Boundary on the Surface of Composite Microspheres Prepared via a Shear- Compressive Mechanical Route [Translated]^†

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, specially designed for the purpose of surface coating. The binding energy of Fe_2p3/2 measured by XPS increased, while that of Si_2p decreased after composite formation. These synchronized shifts increased with increasing intensity of mechanical stress. After heat treatments, chemical interaction during mechanical treatment at the Fe₃O₄/SiO₂ interlayer in a composite particle was verified. The fine structure of the interlayer boundary was also examined in detail by electron microscopy.

^† This report was originally printed in J. Soc. Powder Technology, Japan. 31(1), 18-24 (1994) in Japanese, before being translated into English by KONA Editorial Committee with the permission of the editorial committee of the Soc. Powder Technology, Japan.