This title appears in the Scientific Report :
2018
Please use the identifier:
http://dx.doi.org/10.1016/j.matpr.2017.09.179 in citations.
Please use the identifier: http://hdl.handle.net/2128/17738 in citations.
Macroscopic nanoparticle assemblies: exploring the structural and magnetic properties of large supercrystals
Macroscopic nanoparticle assemblies: exploring the structural and magnetic properties of large supercrystals
In the present work we demonstrate, how the self-assembly of nanoparticles provides a simple and straightforward way to fabricate ordered nanocomposites on length scales of up to 300…1000 µm. We realize this by employing a centrifugation assisted sedimentation technique. We start with magnetic iron...
Saved in:
Personal Name(s): | Wilbs, Genevieve (Corresponding author) |
---|---|
Smik, M. / Rücker, U. / Petracic, O. / Brückel, T. | |
Contributing Institute: |
Streumethoden; JCNS-2 JARA-FIT; JARA-FIT Streumethoden; PGI-4 |
Published in: | Materials today / Proceedings, 4 (2017) S. S146-S153 |
Imprint: |
Amsterdam [u.a.]
Elsevier
2017
|
DOI: |
10.1016/j.matpr.2017.09.179 |
Document Type: |
Journal Article |
Research Program: |
Jülich Centre for Neutron Research (JCNS) Materials and Processes for Energy and Transport Technologies Quantum Condensed Matter: Magnetism, Superconductivity Controlling Collective States Controlling Collective States |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/17738 in citations.
In the present work we demonstrate, how the self-assembly of nanoparticles provides a simple and straightforward way to fabricate ordered nanocomposites on length scales of up to 300…1000 µm. We realize this by employing a centrifugation assisted sedimentation technique. We start with magnetic iron oxide nanoparticles (NPs) with an average diameter of 15 nm, which are dispersed in toluene. The particles are coated with an organic shell to prevent unordered agglomeration of particles. After centrifugation and subsequent drying large macroscopic assemblies of NPs are obtained. The characterization of the samples using scanning electron microscopy (SEM), x-ray diffraction (XRD) and small angle x-ray scattering (SAXS) reveals that the samples are NP macro-polycrystals. By variation of the fabrication parameters as e.g. centrifugation speed and temperature we obtain a systematic study on how NP ordering, crystallinity and morphology depend on the fabrication parameters. Moreover, the magnetic properties of the NP macro-polycrystals are studied using superconducting quantum interference device (SQUID) magnetometry. |