Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Preparation of Fe3O4 Spherical Nanoporous Particles Facilitated by Polyethylene Glycol 4000 | Nanoscale Res Lett 2009 4 1439-1446 DOI s11671-009-9417-4 NANO EXPRESS Preparation of Fe3O4 Spherical Nanoporous Particles Facilitated by Polyethylene Glycol 4000 Li-Li Wang Ji-Sen Jiang Received 20 April 2009 Accepted 12 August 2009 Published online 2 September 2009 to the authors 2009 Abstract Much interest has been attracted to the magnetic materials with porous structure because of their unique properties and potential applications. In this report Fe3O4 nanoporous particles assembled from small Fe3O4 nanoparticles have been prepared by thermal decomposition of iron acetylacetonate in the presence of polyethylene glycol 4000. The size of the spherical nanoporous particles is 100-200 nm. Surface area measurement shows that these Fe3O4 nanoporous particles have a high surface area of m2 g. Magnetization measurement and Mossbauer spectrum indicate that these particles are nearly superpara-magnetic at room temperature. It is found that the morphology of the products is greatly influenced by polyethylene glycol concentration and the polymerization degree of polyethylene glycol. Polyethylene glycol molecules are believed to facilitate the formation of the spherical assembly. Keywords Nanoporous Magnetite Polyethylene glycol Transmission electron microscopy Magnetic measurement Introduction In the past decade a variety of methods have been developed to form highly structure-controlled materials of functionalized metal semiconductor and copolymer nanoparticles on the nano- or microscale. As a versatile kind of material magnetite has attracted much attention in recent years. . Wang . Jiang H Department of Physics Center of Functional Nanomaterials and Devices East China Normal University North Zhongshan Rd. 3663 200062 Shanghai People s Republic of China e-mail jsjiang@ Magnetite is a common ferrite that has a cubic inverse spinel structure 1 . The compound has exhibited unique electric and magnetic properties based on the transfer of
