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Colloidal Flower-Shaped Iron Oxide Nanoparticles: Synthesis Strategies and Coatings

AuthorsGavilán, Helena ; Morales, M. P.
Issue DateJul-2017
PublisherJohn Wiley & Sons
CitationParticle and Particle Systems Characterization 34(7): 1700094 (2017)
AbstractThe 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.
DescriptionGavilán, Helena et al.
Publisher version (URL)https://doi.org/10.1002/ppsc.201700094
Appears in Collections:(ICMM) Artículos
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