Colloidal Flower-Shaped Iron Oxide Nanoparticles: Synthesis Strategies and Coatings
Artikel i vetenskaplig tidskrift, 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.

magnetic properties

magnetite

nanoflowers

self-assembly

colloids

Författare

Helena Gavilan

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

A. Kowalski

Micromod Partikeltechnologie GmbH

D. Heinke

NanoPET Pharma GmbH

A. Sugunan

SP Swedish Technical Research Institute

J. Sommertune

SP Swedish Technical Research Institute

M. Varon

Danmarks Tekniske Universitet

L. K. Bogart

UCL

Oliver Posth

Physikalisch-Technische Bundesanstalt

Lunjie Zeng

Chalmers, Fysik, Eva Olsson Group

D. Gonzalez-Alonso

Universidad de Cantabria

Christoph Balceris

Technische Universitat Braunschweig

J. Fock

Danmarks Tekniske Universitet

E. Wetterskog

Angstrom Laboratory

C. Frandsen

Danmarks Tekniske Universitet

N. Gehrke

NanoPET Pharma GmbH

C. Gruttner

Micromod Partikeltechnologie GmbH

A. Fornara

SP Swedish Technical Research Institute

Frank Ludwig

Technische Universitat Braunschweig

S. Veintemillas-Verdaguer

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

C. Johansson

RISE Acreo

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

Ämneskategorier

Fysikalisk kemi

DOI

10.1002/ppsc.201700094