Volume 34, Issue 7 1700094
Full Paper

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

Helena Gavilán

Corresponding Author

Helena Gavilán

Department of Energy, Environment and Health, Instituto de Ciencia de Materiales de Madrid, ICMM/CSIC, Sor Juana Inés de la Cruz 3, 28049 Madrid, Spain

E-mail: [email protected], [email protected]Search for more papers by this author
Anja Kowalski

Anja Kowalski

Micromod Partikeltechnologie GmbH, Friedrich-Barnewitz-Str. 4, D-18119 Rostock, Germany

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David Heinke

David Heinke

NanoPET Pharma GmbH, D-10115 Berlin, Germany

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Abhilash Sugunan

Abhilash Sugunan

The Swedish Research Institute, Box 5607, SE-114 86 Stockholm, Sweden

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Jens Sommertune

Jens Sommertune

The Swedish Research Institute, Box 5607, SE-114 86 Stockholm, Sweden

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Miriam Varón

Miriam Varón

Department of Physics, Technical University of Denmark, Fysikvej, 2800 Kongens Lyngby, Denmark

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Lara K. Bogart

Lara K. Bogart

Healthcare Biomagnetics Laboratory, University College of London, 21 Albemarle Street, London, W1S 4BS UK

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Oliver Posth

Oliver Posth

Physikalisch-Technische Bundesanstalt, Abbestr. 2–12, 10587 Berlin, Germany

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Lunjie Zeng

Lunjie Zeng

Department of Applied Physics, Chalmers University of Technology, SE-41296 Gothenburg, Sweden

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David González-Alonso

David González-Alonso

Department of CITIMAC, University of Cantabria, 39005 Santander, Spain

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Christoph Balceris

Christoph Balceris

Institute of Electrical Measurement and Fundamental Electrical Engineering, TU Braunschweig, 38106 Braunschweig, Germany

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Jeppe Fock

Jeppe Fock

Department of Micro- and Nanotechnology, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark

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Erik Wetterskog

Erik Wetterskog

Department of Engineering Sciences, Ångström Laboratory, Uppsala University, SE-75121 Uppsala, Sweden

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Cathrine Frandsen

Cathrine Frandsen

Department of Physics, Technical University of Denmark, Fysikvej, 2800 Kongens Lyngby, Denmark

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Nicole Gehrke

Nicole Gehrke

NanoPET Pharma GmbH, D-10115 Berlin, Germany

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Cordula Grüttner

Cordula Grüttner

Micromod Partikeltechnologie GmbH, Friedrich-Barnewitz-Str. 4, D-18119 Rostock, Germany

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Andrea Fornara

Andrea Fornara

The Swedish Research Institute, Box 5607, SE-114 86 Stockholm, Sweden

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Frank Ludwig

Frank Ludwig

Institute of Electrical Measurement and Fundamental Electrical Engineering, TU Braunschweig, 38106 Braunschweig, Germany

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Sabino Veintemillas-Verdaguer

Sabino Veintemillas-Verdaguer

Instituto de Ciencia de Materiales de Madrid, ICMM/CSIC, Sor Juana Inés de la Cruz 3, 28049 Madrid, Spain

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Christer Johansson

Christer Johansson

RISE Acreo, P.O. Box 53071, SE-40014 Göteborg, Sweden

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M. Puerto Morales

Corresponding Author

M. Puerto Morales

Department of Energy, Environment and Health, Instituto de Ciencia de Materiales de Madrid, ICMM/CSIC, Sor Juana Inés de la Cruz 3, 28049 Madrid, Spain

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First published: 05 June 2017
Citations: 79

Abstract

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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