期刊
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
卷 34, 期 7, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ppsc.201700094
关键词
colloids; magnetic properties; magnetite; nanoflowers; self-assembly
资金
- European Commission Framework Program 7 (NanoMag project) [604448]
- Spanish Ministry of Economy and Competitiveness (Mago project) [MAT2014-52069-R]
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.
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