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Colloidal Flower-Shaped Iron Oxide Nanoparticles: Synthesis Strategies and Coatings
ICMM CSIC, Inst Ciencia Mat Madrid, Dept Energy Environm & Hlth, Sor Juana Ines de la Cruz 3, Madrid 28049, Spain..
Micromod Partikeltechnol GmbH, Friedrich Barnewitz Str 4, D-18119 Rostock, Germany..
NanoPET Pharma GmbH, D-10115 Berlin, Germany..
Swedish Res Inst, Box 5607, SE-11486 Stockholm, Sweden..
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2017 (English)In: Particle & particle systems characterization, ISSN 0934-0866, E-ISSN 1521-4117, Vol. 34, no 7, article id 1700094Article in journal (Refereed) Published
Abstract [en]

The assembly of magnetic cores into regular structures may notably influence the properties displayed by a magnetic colloid. Here, key synthesis parameters driving the self-assembly process capable of organizing colloidal magnetic cores into highly regular and reproducible multi-core nanoparticles are determined. In addition, a self-consistent picture that explains the collective magnetic properties exhibited by these complex assemblies is achieved through structural, colloidal, and magnetic means. For this purpose, different strategies to obtain flower-shaped iron oxide assemblies in the size range 25-100 nm are examined. The routes are based on the partial oxidation of Fe(OH)(2), polyol-mediated synthesis or the reduction of iron acetylacetonate. The nanoparticles are functionalized either with dextran, citric acid, or alternatively embedded in polystyrene and their long-term stability is assessed. The core size is measured, calculated, and modeled using both structural and magnetic means, while the Debye model and multi-core extended model are used to study interparticle interactions. This is the first step toward standardized protocols of synthesis and characterization of flower-shaped nanoparticles.

Place, publisher, year, edition, pages
2017. Vol. 34, no 7, article id 1700094
Keywords [en]
colloids, magnetic properties, magnetite, nanoflowers, self-assembly
National Category
Nano Technology
Identifiers
URN: urn:nbn:se:uu:diva-331960DOI: 10.1002/ppsc.201700094ISI: 000405837700002OAI: oai:DiVA.org:uu-331960DiVA, id: diva2:1151033
Funder
EU, FP7, Seventh Framework Programme, 604448Available from: 2017-10-20 Created: 2017-10-20 Last updated: 2017-10-20Bibliographically approved

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Wetterskog, Erik

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