Silica-coating of fluorescent polystyrene microspheres by a seeded polymerization technique and their photo-bleaching property

Yoshio Kobayashi, Kiyoto Misawa, Masaki Kobayashi, Motohiro Takeda, Mikio Konno, Masanobu Satake, Yoshiyuki Kawazoe, Noriaki Ohuchi, Atsuo Kasuya

研究成果: Article査読

40 被引用数 (Scopus)

抄録

This paper describes silica-coating of polystyrene microspheres incorporated with fluorescence dyes (fluorescent microspheres) by means of a seeded polymerization technique based on Stöber method. The silica-coating of the fluorescent microspheres was performed in the presence of 0-10 g/l polyvinylpyrrolidone (PVP), 1.13-17 M water, 0-1.2 M aqueous ammonia and 0.00038-0.2 M tetraethoxyorthosilicate (TEOS). The addition of PVP was found to suppress the generation of free silica particles and improve the uniformity of shell thickness. The silica shell thickness increased from 13 to 138 nm with an increase in TEOS concentration at 10 g/l PVP, 0.4 M aqueous ammonia and 10.9 M water. The thickness also increased with the ammonia concentration and the water concentration. However, excess ammonia and water caused aggregation of free silica particles and the polystyrene microspheres. The silica-coated fluorescence microspheres showed more stable fluorescence to laser-irradiation than uncoated microspheres.

本文言語English
ページ(範囲)47-52
ページ数6
ジャーナルColloids and Surfaces A: Physicochemical and Engineering Aspects
242
1-3
DOI
出版ステータスPublished - 2004 8 2

ASJC Scopus subject areas

  • 表面および界面
  • 物理化学および理論化学
  • コロイド化学および表面化学

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