Preparation of superparamagnetic magnetite nanoparticles by reverse precipitation method: Contribution of sonochemically generated oxidants

Yoshiteru Mizukoshi, Tatsuya Shuto, Naoya Masahashi, Shuji Tanabe

研究成果: Article査読

51 被引用数 (Scopus)

抄録

Magnetic iron oxide nanoparticles were successfully prepared by a novel reverse precipitation method with the irradiation of ultrasound. TEM, XRD and SQUID analyses showed that the formed particles were magnetite (Fe3O4) with about 10 nm in their diameter. The magnetite nanoparticles exhibited superparamagnetism above 200 K, and the saturation magnetization was 32.8 emu/g at 300 K. The sizes and size distributions could be controlled by the feeding conditions of FeSO4 · 7H2O aqueous solution, and slower feeding rate and lower concentration lead to smaller and more uniform magnetite nanoparticles. The mechanisms of sonochemical oxidation were also discussed. The analyses of sonochemically produced oxidants in the presence of various gases suggested that besides sonochemically formed hydrogen peroxide, nitrite and nitrate ions contributed to Fe(II) ion oxidation.

本文言語English
ページ(範囲)525-531
ページ数7
ジャーナルUltrasonics Sonochemistry
16
4
DOI
出版ステータスPublished - 2009 4

ASJC Scopus subject areas

  • 化学工学(その他)
  • 環境化学
  • 放射線学、核医学およびイメージング
  • 音響学および超音波学
  • 有機化学
  • 無機化学

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