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@ARTICLE{Scotti:851481,
author = {Scotti, A. and Brugnoni, M. and Rudov, A. A. and Houston,
Judith and Potemkin, I. I. and Richtering, W.},
title = {{H}ollow microgels squeezed in overcrowded environments},
journal = {The journal of chemical physics},
volume = {148},
number = {17},
issn = {1089-7690},
address = {Melville, NY},
publisher = {American Institute of Physics},
reportid = {FZJ-2018-05117},
pages = {174903 -},
year = {2018},
abstract = {We study how a cavity changes the response of hollow
microgels with respect to regular ones in overcrowded
environments. The structural changes of hollow
poly(N-isopropylacrylamide) microgels embedded within a
matrix of regular ones are probed by small-angle neutron
scattering with contrast variation. The form factors of the
microgels at increasing compressions are directly measured.
The decrease of the cavity size with increasing
concentration shows that the hollow microgels have an
alternative way with respect to regular cross-linked ones to
respond to the squeezing due to their neighbors. The
structural changes under compression are supported by the
radial density profiles obtained with computer simulations.
The presence of the cavity offers to the polymer network the
possibility to expand toward the center of the microgels in
response to the overcrowded environment. Furthermore, upon
increasing compression, a two step transition occurs: First
the microgels are compressed but the internal structure is
unchanged; then, further compression causes the fuzzy shell
to collapse completely and reduce the size of the cavity.
Computer simulations also allow studying higher compression
degrees than in the experiments leading to the microgel’s
faceting},
cin = {JCNS-FRM-II / Neutronenstreuung ; JCNS-1 / JARA-HPC},
ddc = {540},
cid = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
I:(DE-Juel1)JCNS-1-20110106 / $I:(DE-82)080012_20140620$},
pnm = {6G15 - FRM II / MLZ (POF3-6G15) / 6G4 - Jülich Centre for
Neutron Research (JCNS) (POF3-623) / Amphoteric Microgels
for Uptake and Release of Polyelectrolytes
$(jhpc41_20160501)$},
pid = {G:(DE-HGF)POF3-6G15 / G:(DE-HGF)POF3-6G4 /
$G:(DE-Juel1)jhpc41_20160501$},
experiment = {EXP:(DE-MLZ)KWS2-20140101},
typ = {PUB:(DE-HGF)16},
pubmed = {pmid:29739205},
UT = {WOS:000431685500026},
doi = {10.1063/1.5026100},
url = {https://juser.fz-juelich.de/record/851481},
}