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


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タイトル: Preparation of superparamagnetic magnetite nanoparticles by reverse precipitation method: Contribution of sonochemically generated oxidants.
著者: Mizukoshi, Yoshiteru / Shuto, Tatsuya / Masahashi, Naoya / Tanabe, Shuji
発行日: 2009年 4月
出版者: Elsevier
引用: Ultrasonics Sonochemistry, 16(4), pp.525-531; 2009
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 (Fe(3)O(4)) with about 10nm in their diameter. The magnetite nanoparticles exhibited superparamagnetism above 200K, and the saturation magnetization was 32.8emu/g at 300K. The sizes and size distributions could be controlled by the feeding conditions of FeSO(4).7H(2)O 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.
キーワード: Magnetic nanoparticle / Magnetite / Sonochemical oxidation
URI: http://hdl.handle.net/10069/20929
ISSN: 13504177
DOI: 10.1016/j.ultsonch.2008.12.017
PubMed ID: 19200771
権利: Copyright © 2009 Elsevier B.V. All rights reserved.
資料タイプ: Journal Article
原稿種類: author
出現コレクション:060 学術雑誌論文

引用URI : http://hdl.handle.net/10069/20929

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