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@ARTICLE{Josten:830495,
author = {Josten, Elisabeth and Wetterskog, Erik and Glavic, Artur
and Boesecke, Peter and Feoktystov, Artem and
Brauweiler-Reuters, Elke and Rücker, Ulrich and
Salazar-Alvarez, German and Brückel, Thomas and Bergström,
Lennart},
title = {{S}uperlattice growth and rearrangement during
evaporation-induced nanoparticle self-assembly},
journal = {Scientific reports},
volume = {7},
number = {1},
issn = {2045-2322},
address = {London},
publisher = {Nature Publishing Group},
reportid = {FZJ-2017-04036},
pages = {2802},
year = {2017},
abstract = {Understanding the assembly of nanoparticles into
superlattices with well-defined morphology and structure is
technologically important but challenging as it requires
novel combinations of in-situ methods with suitable spatial
and temporal resolution. In this study, we have followed
evaporation-induced assembly during drop casting of
superparamagnetic, oleate-capped γ-Fe2O3 nanospheres
dispersed in toluene in real time with Grazing Incidence
Small Angle X-ray Scattering (GISAXS) in combination with
droplet height measurements and direct observation of the
dispersion. The scattering data was evaluated with a novel
method that yielded time-dependent information of the
relative ratio of ordered (coherent) and disordered
particles (incoherent scattering intensities), superlattice
tilt angles, lattice constants, and lattice constant
distributions. We find that the onset of superlattice growth
in the drying drop is associated with the movement of a
drying front across the surface of the droplet. We couple
the rapid formation of large, highly ordered superlattices
to the capillary-induced fluid flow. Further evaporation of
interstitital solvent results in a slow contraction of the
superlattice. The distribution of lattice parameters and
tilt angles was significantly larger for superlattices
prepared by fast evaporation compared to slow evaporation of
the solvent},
cin = {JCNS-2 / PGI-4 / JARA-FIT / JCNS (München) ; Jülich
Centre for Neutron Science JCNS (München) ; JCNS-FRM-II /
ICS-8},
ddc = {000},
cid = {I:(DE-Juel1)JCNS-2-20110106 / I:(DE-Juel1)PGI-4-20110106 /
$I:(DE-82)080009_20140620$ /
I:(DE-Juel1)JCNS-FRM-II-20110218 /
I:(DE-Juel1)ICS-8-20110106},
pnm = {144 - Controlling Collective States (POF3-144) / 524 -
Controlling Collective States (POF3-524) / 6212 - Quantum
Condensed Matter: Magnetism, Superconductivity (POF3-621) /
6213 - Materials and Processes for Energy and Transport
Technologies (POF3-621) / 6G4 - Jülich Centre for Neutron
Research (JCNS) (POF3-623)},
pid = {G:(DE-HGF)POF3-144 / G:(DE-HGF)POF3-524 /
G:(DE-HGF)POF3-6212 / G:(DE-HGF)POF3-6213 /
G:(DE-HGF)POF3-6G4},
experiment = {EXP:(DE-MLZ)KWS1-20140101},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000402690200018},
pubmed = {pmid:28584236},
doi = {10.1038/s41598-017-02121-4},
url = {https://juser.fz-juelich.de/record/830495},
}