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Core-shell nanostructured cobalt ferrite-sisesquioxane-epoxy composites: nanofiller surface treatment, particle dispersion, mechanical and magnetic properties
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.ORCID iD: 0000-0003-2170-0076
School of Science, Wuhan University of Technology.
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(English)In: Chemistry of Materials, ISSN 0897-4756, E-ISSN 1520-5002, 1-44 p.Article in journal (Refereed) Submitted
Abstract [en]

Magnetic core-shell cobalt ferrite-silsesquioxane-epoxy nanocomposites have been prepared with uniform nanoparticle distribution. The nanoparticles were surface-treated with methyl- (MTMS), aminopropyl- (APTMS), glycidoxypropyl- (GPTMS) trimethoxy-silane. The optimum coating process was performed in a water/merthanol solution on the particles directly after their synthesis without prior drying. The GPTMS-coatings were 30 nm thick and the nanoparticles dispersed well in epoxy without sedimentation. The MTMS-coated nanoparticles (3 nm coating) formed weak agglomerates in epoxy but showed no sedimentation. The APTMS-coated particles formed stronger agglomerates, which led to sedimentation of the aorticles during molding. The GPTMS-based composites showed higher fracture toughness than the MTMS-based composites. This was attributed to the presence of large agglomerates in the latter systems and to the stronger interface between coating and epoxy in the former systems. Ultrasonic alkaline etching allowed precis determination of the ferrite content of the core-shell nanoparticles. Magnetometry showe a markedly lower coercivity for nanoparticles with thin coatings (MTMS) than for the nanoparticles with thicker coatings (GPTMS) suggesting the occurrence of magnetic exchange interaction in the former systems. The nanocomposites showed no influence of surface coating on coercivity or saturation magnetization suggesting that the inter-particle distances were greater than 0.5 nm.

Place, publisher, year, edition, pages
1-44 p.
Keyword [en]
nanocomposites, cobalt ferrite, epoxy, core-shell nanoparticles
National Category
Polymer Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-24042OAI: oai:DiVA.org:kth-24042DiVA: diva2:342855
Note
QC 20100811Available from: 2010-08-11 Created: 2010-08-11 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

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Ström, Valter

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