title: Incorporation of iron oxide nanoparticles and quantum dots into silica microspheres.
abstract: We describe the synthesis of magnetic and fluorescent silica microspheres fabricated by incorporating maghemite (gamma-Fe2O3) nanoparticles (MPs) and CdSe/CdZnS core/shell quantum dots (QDs) into a silica shell around preformed silica microspheres. The resultant approximately 500 nm microspheres have a narrow size distribution and show uniform incorporation of QDs and MPs into the shell. We have demonstrated manipulation of these microspheres using an external magnetic field with real-time fluorescence microscopy imaging.
authors.affiliation: Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors.forename: Numpon
authors.initials: N
authors.lastname: Insin
authors.forename: Joseph B
authors.initials: JB
authors.lastname: Tracy
authors.forename: Hakho
authors.initials: H
authors.lastname: Lee
authors.forename: John P
authors.initials: JP
authors.lastname: Zimmer
authors.forename: Robert M
authors.initials: RM
authors.lastname: Westervelt
authors.forename: Moungi G
authors.initials: MG
authors.lastname: Bawendi
mesh_terms: D003460:Crystallization / Q000379:methods*; D005290:Ferric Compounds / Q000737:chemistry*; D046911:Macromolecular Substances / Q000737:chemistry; D008280:Magnetics / Q000379:methods*; D008422:Materials Testing; D008863:Microspheres; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods; D010316:Particle Size; D045663:Quantum Dots; D012822:Silicon Dioxide / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D005290:Ferric Compounds; D046911:Macromolecular Substances; C000499:ferric oxide; D012822:Silicon Dioxide