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Type: Artigo de periódico
Title: Influence of stirring velocity on the synthesis of magnetite nanoparticles (Fe3O4) by the co-precipitation method
Author: Valenzuela, R
Fuentes, MC
Parra, C
Baeza, J
Duran, N
Sharma, SK
Knobel, M
Freer, J
Abstract: Superparamagnetic magnetite nanoparticles (mean diameter similar to 10 nm) were synthesized using the co-precipitation route from Fe2+/Fe3+ in aqueous solutions (molar ratio 1:2) by adding a base under mechanical stirring at 10.000 rpm. This stirring velocity was found to be suitable for obtaining nanoparticles of this mean size, and a decrease in stirring velocity resulted in a larger size (similar to 19 nm) and a wider size distribution. At 18,000 rpm, in addition to magnetite, goethite is also synthesized in the form of nanoparticles and nanorods are found. At higher stirring velocities (25,000 rpm). the solution's core temperature increased from 20 degrees to 37 degrees C, generating a mixture of non-magnetic iron compounds. (C) 2009 Elsevier B.V. All rights reserved.
Subject: Oxide materials
Magnetic measurements
Country: Suíça
Editor: Elsevier Science Sa
Citation: Journal Of Alloys And Compounds. Elsevier Science Sa, v. 488, n. 1, n. 227, n. 231, 2009.
Rights: fechado
Identifier DOI: 10.1016/j.jallcom.2009.08.087
Date Issue: 2009
Appears in Collections:Unicamp - Artigos e Outros Documentos

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