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Core-Shell Structured Ferrite-Silsesquioxane-Epoxy Nanocomposites: Composite Homogeneity and 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, Engineering Material Physics.ORCID iD: 0000-0003-2170-0076
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2011 (English)In: Polymer Engineering and Science, ISSN 0032-3888, E-ISSN 1548-2634, Vol. 51, no 5, 862-874 p.Article in journal (Refereed) Published
Abstract [en]

Epoxy-based composites of ferrite nanoparticles (50 nm) with 3-glycidoxypropyl- (GPTMS), aminopropyl(APTMS), or methyl-silsesquioxane (MTMS) coatings are reported. The GPTMS coatings (30-nm thick) allowed uniform particle dispersion in the epoxy and prevented sedimentation of the nanoparticles, whereas the APTMS-coated particles formed agglomerates, leading to particle sedimentation. The particles with the thinnest coating (MTMS - 3 nm) agglomerated in the composites without sedimentation. The composites based on GPTMS-coated particles showed higher fracture toughness than the composites based on MTMS-coated particles. The uniformity and thickness of the coatings were related to alcohol composition of the coating media. Coating removal by a novel ultrasonic etching allowed precise determination of the effective ferrite content in the coated nanoparticles. A markedly lower coercivity for nanoparticles without coatings as compared with the nanoparticles with thicker coatings was observed. The saturation magnetization and the coercivity of the composites were independent of coating and casting procedures.

Place, publisher, year, edition, pages
2011. Vol. 51, no 5, 862-874 p.
Keyword [en]
IRON-OXIDE NANOPARTICLES, ORGANIC-INORGANIC MATERIALS, SILANE COUPLING AGENT, COBALT FERRITE, SOL-GEL, SURFACE MODIFICATION, SILICA, PARTICLES, POLYMER, DISPERSION
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-33693DOI: 10.1002/pen.21892ISI: 000289926300006Scopus ID: 2-s2.0-79954433940OAI: oai:DiVA.org:kth-33693DiVA: diva2:418632
Note
QC 20110523Available from: 2011-05-23 Created: 2011-05-16 Last updated: 2017-12-11Bibliographically approved

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Ström, Valter

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