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Synthesis and characterization of ferrite based nanocomposites for microwave absorbing applications
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
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: urn:nbn:se:kth:diva-436OAI: oai:DiVA.org:kth-436DiVA: diva2:11954
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
List of papers
1. Synthesis and characterization of cubic cobalt ferrite nanoparticles
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2005 (English)In: Ninth International Conference on Ferrites (ICF-9) / [ed] Soohoo, RF, 2005, 835-840 p.Conference paper, Published paper (Refereed)
Abstract [en]

The preparation of approximately 20 g cubic cobalt ferrite nanoparticles (edge length 30-60 nm) with composition CoxFe3-xO4 (0.85 center dot x center dot 1.00 +/- 0.02) using the co-precipitation method in a batch type reactor has been investigated. The morphology, composition, size and size distribution of the synthesized particles were characterized by transmission electron microscopy, X-ray diffraction and the BET method. The majority of the particles were cubic although spherical particles were also observed. Aging of the suspensions resulted in a narrowing of the initial size distribution with no effect on the morphology and composition of the particles.

Keyword
particles, powders, precipitation
National Category
Polymer Chemistry
Identifiers
urn:nbn:se:kth:diva-24041 (URN)000227460600129 ()1-57498-218-4 (ISBN)
Conference
9th International Conference on Ferrites (ICF-9), San Francisco, CA, AUG 22-27, 2004
Note

QC 20100811

Available from: 2010-08-11 Created: 2010-08-11 Last updated: 2016-12-21Bibliographically approved
2. Controlled synthesis of near-stoichiometric cobalt ferrite nanoparticles
Open this publication in new window or tab >>Controlled synthesis of near-stoichiometric cobalt ferrite nanoparticles
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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.

Keyword
magnetic-properties, particles, manganese, hematite, powders, precipitation, hydrolysis, oxidation, goethite
National Category
Polymer Chemistry
Identifiers
urn:nbn:se:kth:diva-15078 (URN)10.1021/cm0501665 (DOI)000232326700029 ()2-s2.0-26944488702 (Scopus ID)
Note
QC 20100811Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved
3. Characterization of particle dispersion and mechanical properties of nanocomposites based on cobalt ferrite nanoparticles with functional silesquioxane coatings.
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(English)Manuscript (preprint) (Other academic)
National Category
Polymer Chemistry
Identifiers
urn:nbn:se:kth:diva-27638 (URN)
Note
QC 20101217Available from: 2010-12-17 Created: 2010-12-17 Last updated: 2010-12-17Bibliographically approved

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