Preparation of composite particles with magnetic silica core and fluorescent polymer shell

Daisuke Nagao, Mikio Yokoyama, Shu Saeki, Yoshio Kobayashi, Mikio Konno

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25 Citations (Scopus)


Dual functions of magnetic and fluorescent properties were created in composite particles that incorporated magnetite (Fe3 O4) nanoparticles in particle cores of silica and fluorescent pyrene in particle shells of polystyrene. The Fe3O4 nanoparticles were prepared with a conventional homogeneous precipitation method and surface modified with a coupling agent of carboxyethylsilanetriol. The silica particles incorporating Fe3O4 nanoparticles were synthesized with a modified Stöber method in which the Fe3/4 nanoparticles were added to a system of tetraethylorthosilicate (TEOS)/ ammonia/water/ethanol. Then, the magnetite/silica composite particles were coated with the pyrene/polystyrene shell in a soap-free emulsion polymerization, which was conducted in the presence of pyrene in a mixed solvent of water/ethanol. The composite particles prepared in the mixed solvent had both magnetic and fluorescent properties. The fluorescent spectrum of the particles with Fe3O4 was very similar to that without Fe3O4, indicating that the magnetic component within the core particles scarcely interfered with the fluorescent emission from the polymer shell.

Original languageEnglish
Pages (from-to)959-964
Number of pages6
JournalColloid and Polymer Science
Issue number8-9
Publication statusPublished - 2008 Aug


  • Composite particle
  • Fluorescence
  • Magnetite
  • Polymer shell
  • Silica


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