DSpace university logo mark
Advanced Search
Japanese | English 

NAOSITE : Nagasaki University's Academic Output SITE > Faculty of Engineering > Articles in academic journal >

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


File Description SizeFormat
UltSon16_525.pdf866.78 kBAdobe PDFView/Open

Title: Preparation of superparamagnetic magnetite nanoparticles by reverse precipitation method: Contribution of sonochemically generated oxidants.
Authors: Mizukoshi, Yoshiteru / Shuto, Tatsuya / Masahashi, Naoya / Tanabe, Shuji
Issue Date: Apr-2009
Publisher: Elsevier
Citation: Ultrasonics Sonochemistry, 16(4), pp.525-531; 2009
Abstract: 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.
Keywords: 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
Rights: Copyright © 2009 Elsevier B.V. All rights reserved.
Type: Journal Article
Text Version: author
Appears in Collections:Articles in academic journal

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

All items in NAOSITE are protected by copyright, with all rights reserved.

 

Valid XHTML 1.0! Copyright © 2006-2015 Nagasaki University Library - Feedback Powerd by DSpace