title: Synthesis of magnetite-silica core-shell nanoparticles via direct silicon oxidation.
abstract: Magnetite-silica core-shell nanoparticles (Fe3O4@SiO2 NPs) were prepared from silicon powder by direct oxidation without using any expensive precursors (such as TEOS) and organic solvents. The as-prepared Fe3O4@SiO2 NPs were characterized by TEM, DLS, XRD, FT-IR, zeta potential and NMR Analyzer. The results show that the Fe3O4@SiO2 NPs are monodispersed core-shell nanostructures with single cores that were uniformly coated by silica shells. The relaxation property indicates that Fe3O4@SiO2 NPs have desirable characteristics for T2 MRI contrast agents. This facile and green method is promising for large-scale production, which would open new opportunities for preparing core-shell nanostructures for biomedical applications.
authors: College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China.
authors: Shuxian
authors: S
authors: Wang
authors: College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China.
authors: Jing
authors: J
authors: Tang
authors: Chemical Group, CNPC Daqing Petroleum Administration Bureau, Daqing 163453, China.
authors: Hongfu
authors: H
authors: Zhao
authors: College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China. Electronic address: wjiaq@qust.edu.cn.
authors: Jiaqi
authors: J
authors: Wan
authors: College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China. Electronic address: kchen@qust.edu.cn.
authors: Kezheng
authors: K
authors: Chen
mesh_terms: D003287:Contrast Media / Q000138:chemical synthesis / Q000737:chemistry; D052203:Ferrosoferric Oxide / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry*; D010084:Oxidation-Reduction; D012825:Silicon / Q000737:chemistry*; D012822:Silicon Dioxide / Q000138:chemical synthesis / Q000737:chemistry
chemical_list: D003287:Contrast Media; D012822:Silicon Dioxide; D052203:Ferrosoferric Oxide; D012825:Silicon
keywords: Core–shell structure; Direct silicon oxidation; Magnetite–silica nanoparticles; Relaxation property