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@INPROCEEDINGS{Lettinga:826116,
author = {Lettinga, M.P. and Korculanin, Olivera and Struth and
Merino, Hermida and Rogers},
title = {{A}nomalous response of nematic platelets under {LAOS}tress
and {S}train revealed by 3{D} {R}heo-{SAXS}},
reportid = {FZJ-2017-00376},
year = {2016},
abstract = {Dispersions of colloidal Gibbsite platelets in the nematic
phase display a complex response to Large Amplitude
Oscillatory Shear (LAOS) flow that strongly depends on the
strain amplitude. [1] In this work we applied LAOStress and
LAOStrain to the nematic dispersion and probed the structure
with time-resolved SAXS measurements. By using plate-plate
and couette geometry, we had access to both the
flow-vorticity and flow-gradient plane, respectively. Thus
we obtained the full 3D rotational motion of the director.
[2]For LAOStress, we observe strong asymmetrical behaviour
both in the rheological and the microscopic response. This
asymmetry is connected to the yielding behaviour of the
platelets. By increasing the stress amplitude we observed
that the response becomes more symmetric; however, this
strongly depends on the frequency, hence the time necessary
for the system to yield. Softening of the response towards
the centre of the gap was observed by scanning the gap while
performing LAOStrain. The structural response at low strain
amplitude does not propagate throughout the gap, where as at
high strain amplitudes the response in the bulk emerges as
erratic.},
month = {Aug},
date = {2016-08-08},
organization = {The XVIIth International Congress on
Rheology, Kyoto (Japan), 8 Aug 2016 -
13 Aug 2016},
subtyp = {After Call},
cin = {ICS-3},
cid = {I:(DE-Juel1)ICS-3-20110106},
pnm = {551 - Functional Macromolecules and Complexes (POF3-551)},
pid = {G:(DE-HGF)POF3-551},
typ = {PUB:(DE-HGF)6},
url = {https://juser.fz-juelich.de/record/826116},
}