关键词: 载体, 聚合物, 还原, 纳米粒子, 界面, 氧化

Abstract: The iron nanoparticles have been synthesized through sodium borohydride chemical solution reduction of ferric iron-impregnated montmorillonite (Mt) in the presence of polyvinylpyrrolidone (PVP) as a stabilizer. A combination of scanning electron microscope, transmission electron microscope, X-ray diffraction, and X-ray photoemission spectroscopy was used to characterize the materials. As a result, these obtained iron particles were well dispersed on the external surface of Mt and were of roughly spherical morphology and uniform particle size with a mean diameter about 34nm. The metallic iron cores remained in these iron nanoparticles were protected from further oxidation by their native iron oxide shell with a thickness of about 3nm. Compared with the iron nanoparticles synthesized in the absence of Mt and PVP, these obtained iron nanoparticles exhibited reduced size and improved dispersity, which should be attributed to the dispersing action of the polymer stabilizer and the delaminated structure of Mt as a results of the interfacial interactions between Mt particles and PVP.

Key words: support, polymers, reduction, nanoparticles, interface, oxidation