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

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• 作者：Daisuke Nagao ; Mikio Yokoyama ; Shu Saeki ; Yoshio Kobayashi and Mikio Konno
• 关键词：Composite particle ; Magnetite ; Silica ; Fluorescence ; Polymer shell
• 刊名：Colloid & Polymer Science
• 出版时间：August, 2008
• 出版年：2008
• 期刊代码：60_0303-402X
• 类别：bio
• 卷：286
• 期：8-9
• 页码：959-964
• 数据来源：sp

摘要

Dual functions of magnetic and fluorescent properties were created in composite particles that incorporated magnetite (Fe₃O₄) 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 St枚ber method in which the Fe₃O₄ 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.