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@ARTICLE{Vad:187749,
author = {Vad, T. and Heidelmann, M. and Weirich, T. E. and Sager,
Wiebke and Zhang, Jing},
title = {{S}elf-assembly of biaxial discorectangular lead carbonate
nanosheets into stacked ribbons studied by {SAXS} and
{HAADF}-{STEM} tomographic tilt series},
journal = {Soft matter},
volume = {10},
number = {47},
issn = {1744-6848},
address = {London},
publisher = {Royal Soc. of Chemistry},
reportid = {FZJ-2015-01340},
pages = {9511 - 9522},
year = {2014},
abstract = {The self-assembling behaviour of 2.6 nm thin PbCO3
nanoplatelets with discorectangular shape and uniform width
and thickness occurring after their formation in nonionic
water-in-oil microemulsions has been investigated using
synchrotron small angle X-ray scattering (SAXS) and
(scanning) transmission electron microscopy ((S)TEM). The
presence of attractive depletion forces originating from the
ubiquitous microemulsion droplets triggers a new type of
superstructure at low particle concentration. Instead of the
universally observed formation of face-to-face assembled
lamellar mesostructures, the nanosheets self-organise into
extended ribbon structures, whereby each on top lying sheet
is displaced by a constant shift in the length and width
directions leading to a so far unprecedented staggered
zigzag-type stack assembly with restricted height. This type
of stacking gives rise to a complex interference pattern in
the isotropic small angle scattering of the stacked ribbon
assemblies (SRAs) in reverse micellar solution. Different to
the, for lamellar-structured nanosheets typical, diffraction
peaks at multiples of the wave vector corresponding to one
particular repeat distance, the scattering peaks measured in
this study are asymmetric, displaying a shoulder on their
low wave vector side. The asymmetric shape of the observed
face-to-face correlation peaks indicates that the SRAs do
not extend in one direction only. Their scattering behaviour
is analysed by expanding the Kratky–Porod structure factor
for stacking plates into three dimensions. High-angle
annular dark-field (HAADF)-STEM tilt series have
complementary been acquired to retrieve three-dimensional
structural information on the SRAs in the dry state and to
confirm the model used for the refinement of the SAXS data.},
cin = {ICS-3 / PGI-5},
ddc = {530},
cid = {I:(DE-Juel1)ICS-3-20110106 / I:(DE-Juel1)PGI-5-20110106},
pnm = {451 - Soft Matter Composites (POF2-451)},
pid = {G:(DE-HGF)POF2-451},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000345090400014},
pubmed = {pmid:25351908},
doi = {10.1039/C4SM01935K},
url = {https://juser.fz-juelich.de/record/187749},
}