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Controlled synthesis of near-stoichiometric cobalt ferrite nanoparticles
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
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2005 (English)In: Chemistry of Materials, ISSN 0897-4756, E-ISSN 1520-5002, Vol. 17, no 20, 5109-5118 p.Article in journal (Refereed) Published
Abstract [en]

Large batches of more than 18 g of cobalt ferrite nanoparticles (CoxFe3-xO4, x being close to 1) have been prepared by the chemie douce approach using aqueous solutions of metal salts at 90 degrees C mixed with solutions of hydroxide ions under air atmosphere. By suitable choice of the metal ion to hydroxide ion ratio, it was possible to prepare nanoparticles with the stoichiometric composition (CoFe2O4). The composition and the density of the nanoparticles could be controlled by varying the metal ion to hydroxide ion molar ratio in the reactor. Adjusting the initial concentration ratios of the reactants prior to the mixing allowed the variation of the average size of the nanoparticles. The repeatability of the average particle diameter of the synthesis was typically 5 nm and average particle sizes could be controlled between 50 and 80 nm determined by nitrogen adsorption measurements (consistent with the number size average 35-60 mn obtained by transmission electron microscopy studies). Aging of the suspensions resulted in a narrowing of the initial broad unimodal distribution. The narrowing of the size distribution was associated with the phase transformation of delta-FeOOH platelets to spinel phase. The spinel nanoparticles had different morphologies: cubic, spherical, and occasionally irregular. Nanoparticles with the stoichiometric composition were a mixture of cubical and spherical shapes. Nanoparticles with less than the stoichiometric cobalt content had an irregular morphology, whereas nanoparticles with greater than the stoichiometric concentration of cobalt were predominantly spherical.

Place, publisher, year, edition, pages
2005. Vol. 17, no 20, 5109-5118 p.
Keyword [en]
magnetic-properties, particles, manganese, hematite, powders, precipitation, hydrolysis, oxidation, goethite
National Category
Polymer Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-15078DOI: 10.1021/cm0501665ISI: 000232326700029Scopus ID: 2-s2.0-26944488702OAI: oai:DiVA.org:kth-15078DiVA: diva2:333119
Note
QC 20100811Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Alternative Routes to Highly Dispersed Cobalt Ferrite Nanocomposites
Open this publication in new window or tab >>Alternative Routes to Highly Dispersed Cobalt Ferrite Nanocomposites
2007 (English)Doctoral thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH, 2007. 95 p.
Series
Trita-CHE-Report, ISSN 1654-1081 ; 2007:19
Keyword
aqueous precipitation, cobalt ferrite, nanoparticles, synthesis, size distribution, silane/silsesquioxane, epoxy, nanocomposites, magnetic cellulose
National Category
Polymer Chemistry
Identifiers
urn:nbn:se:kth:diva-4328 (URN)978-91-7178-627-2 (ISBN)
Public defence
2007-04-20, Sal K2, KTH, Teknikringen 28, Stockholm, 14:00
Opponent
Supervisors
Note
QC 20100811Available from: 2007-04-12 Created: 2007-04-12 Last updated: 2010-08-11Bibliographically approved
2. Synthesis and characterization of ferrite based nanocomposites for microwave absorbing applications
Open this publication in new window or tab >>Synthesis and characterization of ferrite based nanocomposites for microwave absorbing applications
2005 (English)Licentiate thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH, 2005. 67 p.
Series
Trita-FPT-Report, ISSN 1652-2443 ; 2005:27
National Category
Polymer Chemistry
Identifiers
urn:nbn:se:kth:diva-436 (URN)
Presentation
2005-09-28, Sal K1, Teknikringen 56, Stockholm, 13:00
Opponent
Supervisors
Note
QC 20101217Available from: 2005-09-28 Created: 2005-09-28 Last updated: 2010-12-17Bibliographically approved

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