Colloidal Flower-Shaped Iron Oxide Nanoparticles: Synthesis Strategies and Coatings
Journal article, 2017

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.

colloids

magnetite

magnetic properties

nanoflowers

self-assembly

Author

Helena Gavilan

CSIC - Instituto de Ciencia de Materiales de Madrid (ICMM)

A. Kowalski

Micromod Partikeltechnologie

D. Heinke

Nanopet Pharma

A. Sugunan

SP Sveriges Tekniska Forskningsinstitut AB

J. Sommertune

SP Sveriges Tekniska Forskningsinstitut AB

M. Varon

Technical University of Denmark (DTU)

L. K. Bogart

University College London (UCL)

Oliver Posth

Physikalisch-Technische Bundesanstalt (PTB)

Lunjie Zeng

Chalmers, Physics, Eva Olsson Group

D. Gonzalez-Alonso

University of Cantabria

Christoph Balceris

Technische Universität Braunschweig

J. Fock

Technical University of Denmark (DTU)

E. Wetterskog

Uppsala University

C. Frandsen

Technical University of Denmark (DTU)

N. Gehrke

Nanopet Pharma

C. Gruttner

Micromod Partikeltechnologie

A. Fornara

SP Sveriges Tekniska Forskningsinstitut AB

Frank Ludwig

Technische Universität Braunschweig

S. Veintemillas-Verdaguer

CSIC - Instituto de Ciencia de Materiales de Madrid (ICMM)

C. Johansson

RISE Research Institutes of Sweden

M. P. Morales

CSIC - Instituto de Ciencia de Materiales de Madrid (ICMM)

Particle and Particle Systems Characterization

0934-0866 (ISSN) 1521-4117 (eISSN)

Vol. 34 7 1700094

Subject Categories

Physical Chemistry

DOI

10.1002/ppsc.201700094

More information

Latest update

4/5/2022 6