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

H. Gavilan ; A. Kowalski ; D. Heinke ; A. Sugunan ; J. Sommertune ; M. Varon ; L. K. Bogart ; O. Posth ; Lunjie Zeng (Institutionen för fysik, Eva Olsson Group (Chalmers)) ; D. Gonzalez-Alonso ; C. Balceris ; J. Fock ; E. Wetterskog ; C. Frandsen ; N. Gehrke ; C. Gruttner ; A. Fornara ; F. Ludwig ; S. Veintemillas-Verdaguer ; C. Johansson ; M. P. Morales
Particle & particle systems characterization (0934-0866). Vol. 34 (2017), 7,
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: colloids, magnetic properties, magnetite, nanoflowers, self-assembly



Denna post skapades 2017-08-18.
CPL Pubid: 251275

 

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Institutioner (Chalmers)

Institutionen för fysik, Eva Olsson Group (Chalmers)

Ämnesområden

Fysikalisk kemi

Chalmers infrastruktur